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‎ej2-asp-core-mvc/ai-assistview/EJ2_ASP.MVC/events.md‎

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@@ -101,4 +101,16 @@ The [AttachmentRemoved](https://help.syncfusion.com/cr/aspnetmvc-js2/Syncfusion.
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{% highlight c# tabtitle="Attachment-remove.cs" %}
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{% include code-snippet/ai-assistview/events/attachment-remove/attachment-remove.cs %}
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{% endhighlight %}
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{% endtabs %}
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{% endtabs %}
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## attachmentClick
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The `AttachmentClick` event is triggered when an attached file is clicked in the AI AssistView.
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{% tabs %}
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{% highlight razor tabtitle="CSHTML" %}
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{% include code-snippet/ai-assistview/events/attachmentClick/razor %}
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{% endhighlight %}
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{% highlight c# tabtitle="AttachmentClick.cs" %}
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{% include code-snippet/ai-assistview/events/attachmentClick/attachmentClick.cs %}
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{% endhighlight %}
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{% endtabs %}

‎ej2-asp-core-mvc/ai-assistview/EJ2_ASP.MVC/file-attachments.md‎

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{% endhighlight %}
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{% endtabs %}
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![FileSize](images/file-size.png)
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![FileSize](images/file-size.png)
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### Setting maximum count
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Restrict how many files can be attached at once using `MaximumCount` property. The default value is `10`. If users select more than the allowed count, the maximum count reached error will be displayed.
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{% tabs %}
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{% highlight razor tabtitle="CSHTML" %}
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{% include code-snippet/ai-assistview/file-attachments/maximumCount/razor %}
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{% endhighlight %}
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{% highlight c# tabtitle="MaximumCount.cs" %}
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{% include code-snippet/ai-assistview/file-attachments/maximumCount/maximumCount.cs %}
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{% endhighlight %}
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{% endtabs %}
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![MaximumCount](images/maximumCount.png)

‎ej2-asp-core-mvc/ai-assistview/EJ2_ASP.NETCORE/events.md‎

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{% highlight razor tabtitle="CSHTML" %}
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{% include code-snippet/ai-assistview/events/attachment-remove/tagHelper %}
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{% endhighlight %}
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{% endtabs %}
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{% endtabs %}
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## attachmentClick
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The `attachmentClick` event is triggered when an attached file is clicked in the AI AssistView.
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{% tabs %}
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{% highlight razor tabtitle="CSHTML" %}
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{% include code-snippet/ai-assistview/events/attachmentClick/tagHelper %}
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{% endhighlight %}
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{% endtabs %}

‎ej2-asp-core-mvc/ai-assistview/EJ2_ASP.NETCORE/file-attachments.md‎

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{% endhighlight %}
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{% endtabs %}
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![FileSize](images/file-size.png)
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![FileSize](images/file-size.png)
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### Setting maximum count
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Restrict how many files can be attached at once using `maximumCount` property. The default value is `10`. If users select more than the allowed count, the maximum count reached error will be displayed.
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{% tabs %}
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{% highlight razor tabtitle="CSHTML" %}
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{% include code-snippet/ai-assistview/file-attachments/maximumCount/razor %}
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{% endhighlight %}
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{% highlight c# tabtitle="MaximumCount.cs" %}
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{% include code-snippet/ai-assistview/file-attachments/maximumCount/maximumCount.cs %}
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{% endhighlight %}
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{% endtabs %}
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![MaximumCount](images/maximumCount.png)

‎ej2-asp-core-mvc/ai-assistview/images/maximumCount.png‎

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‎ej2-asp-core-mvc/chat-ui/EJ2_ASP.MVC/events.md‎

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{% include code-snippet/chat-ui/events/userTyping/userTyping.cs %}
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{% endhighlight %}
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{% endtabs %}
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## Before attachment upload
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The `BeforeAttachmentUpload` event is triggered before attached files begin uploading in the Chat UI.
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{% tabs %}
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{% highlight razor tabtitle="CSHTML" %}
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{% include code-snippet/chat-ui/events/beforeAttachmentUpload/razor %}
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{% endhighlight %}
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{% highlight c# tabtitle="BeforeAttachmentUpload.cs" %}
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{% include code-snippet/chat-ui/events/beforeAttachmentUpload/beforeAttachmentUpload.cs %}
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{% endhighlight %}
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{% endtabs %}
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## Attachment upload success
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The `AttachmentUploadSuccess` event is triggered when an attached file is successfully uploaded in the Chat UI.
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{% tabs %}
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{% highlight razor tabtitle="CSHTML" %}
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{% include code-snippet/chat-ui/events/attachmentUploadSuccess/razor %}
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{% endhighlight %}
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{% highlight c# tabtitle="AttachmentUploadSuccess.cs" %}
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{% include code-snippet/chat-ui/events/attachmentUploadSuccess/attachmentUploadSuccess.cs %}
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{% endhighlight %}
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{% endtabs %}
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## Attachment upload failure
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The `AttachmentUploadFailure` event is triggered when an attached file upload fails in the Chat UI.
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{% tabs %}
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{% highlight razor tabtitle="CSHTML" %}
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{% include code-snippet/chat-ui/events/attachmentUploadFailure/razor %}
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{% endhighlight %}
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{% highlight c# tabtitle="AttachmentUploadFailure.cs" %}
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{% include code-snippet/chat-ui/events/attachmentUploadFailure/attachmentUploadFailure.cs %}
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{% endhighlight %}
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{% endtabs %}
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## Attachment removed
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The `AttachmentRemoved` event is triggered when an attached file is removed from the Chat UI.
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{% tabs %}
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{% highlight razor tabtitle="CSHTML" %}
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{% include code-snippet/chat-ui/events/attachmentRemoved/razor %}
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{% endhighlight %}
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{% highlight c# tabtitle="AttachmentRemoved.cs" %}
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{% include code-snippet/chat-ui/events/attachmentRemoved/attachmentRemoved.cs %}
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{% endhighlight %}
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{% endtabs %}
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## Attachment click
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The `AttachmentClick` event is triggered when an attached file is clicked in the Chat UI.
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{% tabs %}
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{% highlight razor tabtitle="CSHTML" %}
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{% include code-snippet/chat-ui/events/attachmentClick/razor %}
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{% endhighlight %}
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{% highlight c# tabtitle="AttachmentClick.cs" %}
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{% include code-snippet/chat-ui/events/attachmentClick/attachmentClick.cs %}
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{% endhighlight %}
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{% endtabs %}

‎ej2-asp-core-mvc/chat-ui/EJ2_ASP.MVC/file-attachments.md‎

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---
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layout: post
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title: Attachments in ##Platform_Name## Chat UI Control | Syncfusion
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description: Checkout and learn about Attachments in Syncfusion ##Platform_Name## Chat UI control of Syncfusion Essential JS 2 and more.
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platform: ej2-asp-core-mvc
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control: Chat UI
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publishingplatform: ##Platform_Name##
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documentation: ug
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---
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# File Attachments in ##Platform_Name## Chat UI control
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The Chat UI control supports message attachments, enabling users to upload and send files (images, documents, and more) alongside messages for richer, more contextual conversations. Enable this functionality using the `EnableAttachments` property and customize the behavior through the `AttachmentSettings` configuration.
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## Enable file attachments
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Enable file attachment support by setting the `EnableAttachments` property to `true`. By default, it is `false`.
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{% tabs %}
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{% highlight razor tabtitle="CSHTML" %}
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{% include code-snippet/chat-ui/file-attachments/enableAttachments/razor %}
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{% endhighlight %}
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{% highlight c# tabtitle="EnableAttachments.cs" %}
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{% include code-snippet/chat-ui/file-attachments/enableAttachments/enableAttachments.cs %}
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{% endhighlight %}
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{% endtabs %}
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## Configure attachment settings
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Use the `AttachmentSettings` property to customize file attachment behavior, including upload endpoints, file type restrictions, and size limits.
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### Setting saveUrl and removeUrl
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Set the `SaveUrl` and `RemoveUrl` properties to specify server endpoints for handling file uploads and removals. The `SaveUrl` processes file uploads, while the `RemoveUrl` handles file deletion requests.
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{% tabs %}
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{% highlight razor tabtitle="CSHTML" %}
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{% include code-snippet/chat-ui/file-attachments/save-remove-url/razor %}
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{% endhighlight %}
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{% highlight c# tabtitle="saveRemoveUrl.cs" %}
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{% include code-snippet/chat-ui/file-attachments/save-remove-url/saveRemoveUrl.cs %}
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{% endhighlight %}
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{% endtabs %}
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### Setting file type
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Use the `AllowedFileTypes` property to specify which file types users can upload. This property accepts file extensions (e.g., '.pdf', '.docx') or MIME types to control the types of files that can be attached.
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{% tabs %}
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{% highlight razor tabtitle="CSHTML" %}
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{% include code-snippet/chat-ui/file-attachments/allowedFileTypes/razor %}
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{% endhighlight %}
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{% highlight c# tabtitle="AllowedFileTypes.cs" %}
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{% include code-snippet/chat-ui/file-attachments/allowedFileTypes/allowedFileTypes.cs %}
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{% endhighlight %}
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{% endtabs %}
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### Setting file size
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Configure the `MaxFileSize` property to define the maximum file size allowed for uploads. Specify the size in bytes. The default value is `30000000` bytes (approximately 30 MB). Files exceeding this limit will not be uploaded.
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{% tabs %}
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{% highlight razor tabtitle="CSHTML" %}
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{% include code-snippet/chat-ui/file-attachments/maxFileSize/razor %}
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{% endhighlight %}
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{% highlight c# tabtitle="MaxFileSize.cs" %}
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{% include code-snippet/chat-ui/file-attachments/maxFileSize/maxFileSize.cs %}
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{% endhighlight %}
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{% endtabs %}
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![MaxFileSize](images/maxFileSize.png)
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### Setting save format
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Control the format used to send files to the server using the `SaveFormat` property when path is not set. It does not change how files are uploaded. The default value is `Blob`.
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- `Blob`: Used for fast, memory‑efficient local previews.
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- `Base64`: Reads the file as a Base64 data URL, useful when you need an inline data URL.
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{% tabs %}
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{% highlight razor tabtitle="CSHTML" %}
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{% include code-snippet/chat-ui/file-attachments/saveFormat/razor %}
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{% endhighlight %}
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{% highlight c# tabtitle="SaveFormat.cs" %}
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{% include code-snippet/chat-ui/file-attachments/saveFormat/saveFormat.cs %}
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{% endhighlight %}
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{% endtabs %}
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### Setting server path
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The `Path` property to specifies the public base URL where uploaded files are (or will be) hosted. When set, it takes precedence over saveFormat.
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{% tabs %}
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{% highlight razor tabtitle="CSHTML" %}
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{% include code-snippet/chat-ui/file-attachments/path/razor %}
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{% endhighlight %}
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{% highlight c# tabtitle="Path.cs" %}
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{% include code-snippet/chat-ui/file-attachments/path/path.cs %}
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{% endhighlight %}
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{% endtabs %}
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### Enabling drag-and-drop
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Toggle drag-and-drop support for attachments via `EnableDragAndDrop` property. The default value is `true`.
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{% tabs %}
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{% highlight razor tabtitle="CSHTML" %}
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{% include code-snippet/chat-ui/file-attachments/drag-and-drop/razor %}
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{% endhighlight %}
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{% highlight c# tabtitle="DragAndDrop.cs" %}
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{% include code-snippet/chat-ui/file-attachments/drag-and-drop/dragAndDrop.cs %}
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{% endhighlight %}
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{% endtabs %}
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### Setting maximum count
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Restrict how many files can be attached at once using `MaximumCount`. The default value is `10`. If users select more than the allowed count, the maxfileSize error will be displayed.
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{% tabs %}
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{% highlight razor tabtitle="CSHTML" %}
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{% include code-snippet/chat-ui/file-attachments/maximumCount/razor %}
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{% endhighlight %}
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{% highlight c# tabtitle="MaximumCount.cs" %}
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{% include code-snippet/chat-ui/file-attachments/maximumCount/maximumCount.cs %}
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{% endhighlight %}
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{% endtabs %}
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![MaximumCount](images/maximumCount.png)
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## Templates
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### Customizing the file preview
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Provide a custom UI for previewing selected files using `PreviewTemplate`. Use this to render thumbnails, filenames, progress, remove buttons, or any additional metadata prior to sending.
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### Customizing the attachments
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Control how attachments appear inside message bubbles with `AttachmentTemplate`. Use this to tailor the display of images, documents, or custom file types once the message is posted.
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{% tabs %}
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{% highlight razor tabtitle="CSHTML" %}
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{% include code-snippet/chat-ui/file-attachments/template/razor %}
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{% endhighlight %}
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{% highlight c# tabtitle="Template.cs" %}
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{% include code-snippet/chat-ui/file-attachments/template/template.cs %}
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{% endhighlight %}
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{% endtabs %}
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![AttachmentTemplate](images/attachmentTemplate.png)
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![PreviewTemplate](images/previewTemplate.png)

‎ej2-asp-core-mvc/chat-ui/EJ2_ASP.NETCORE/events.md‎

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{% include code-snippet/chat-ui/events/userTyping/userTyping.cs %}
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{% endhighlight %}
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{% endtabs %}
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## Before attachment upload
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The `beforeAttachmentUpload` event is triggered before attached files begin uploading in the Chat UI.
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{% tabs %}
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{% highlight razor tabtitle="CSHTML" %}
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{% include code-snippet/chat-ui/events/beforeAttachmentUpload/tagHelper %}
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{% endhighlight %}
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{% highlight c# tabtitle="BeforeAttachmentUpload.cs" %}
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{% include code-snippet/chat-ui/events/beforeAttachmentUpload/beforeAttachmentUpload.cs %}
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{% endhighlight %}
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{% endtabs %}
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## Attachment upload success
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The `attachmentUploadSuccess` event is triggered when an attached file is successfully uploaded in the Chat UI.
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{% tabs %}
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{% highlight razor tabtitle="CSHTML" %}
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{% include code-snippet/chat-ui/events/attachmentUploadSuccess/tagHelper %}
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{% endhighlight %}
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{% highlight c# tabtitle="AttachmentUploadSuccess.cs" %}
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{% include code-snippet/chat-ui/events/attachmentUploadSuccess/attachmentUploadSuccess.cs %}
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{% endhighlight %}
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{% endtabs %}
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## Attachment upload failure
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The `attachmentUploadFailure` event is triggered when an attached file upload fails in the Chat UI.
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{% tabs %}
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{% highlight razor tabtitle="CSHTML" %}
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{% include code-snippet/chat-ui/events/attachmentUploadFailure/tagHelper %}
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{% endhighlight %}
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{% highlight c# tabtitle="AttachmentUploadFailure.cs" %}
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{% include code-snippet/chat-ui/events/attachmentUploadFailure/attachmentUploadFailure.cs %}
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{% endhighlight %}
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{% endtabs %}
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## Attachment removed
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The `attachmentRemoved` event is triggered when an attached file is removed from the Chat UI.
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{% tabs %}
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{% highlight razor tabtitle="CSHTML" %}
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{% include code-snippet/chat-ui/events/attachmentRemoved/tagHelper %}
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{% endhighlight %}
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{% highlight c# tabtitle="AttachmentRemoved.cs" %}
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{% include code-snippet/chat-ui/events/attachmentRemoved/attachmentRemoved.cs %}
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{% endhighlight %}
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{% endtabs %}
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## Attachment click
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The `attachmentClick` event is triggered when an attached file is clicked in the Chat UI.
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{% tabs %}
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{% highlight razor tabtitle="CSHTML" %}
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{% include code-snippet/chat-ui/events/attachmentClick/tagHelper %}
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{% endhighlight %}
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{% highlight c# tabtitle="AttachmentClick.cs" %}
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{% include code-snippet/chat-ui/events/attachmentClick/attachmentClick.cs %}
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{% endhighlight %}
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{% endtabs %}

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