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Topic: File Upload control inside UpdatePanel with postback trigger fails first time succeeds subsequently

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User: dhiraj5079 Post Date: 15 Apr 2011 06:57

One case this may happen is when your fileupload control is not visible for the first time when
page load and you are making it visible inside update panel asynchronously.

Main Content:

Put this into the page_load event

 if (!IsPostBack)


            Page.Form.Enctype = "multipart/form-data";


and Magic! it is working for the first time also.

Let me explain the magic

Since FileUpload work needs the form should have enctype="multipart/form-data".

It is set in overriden OnPreRender method of FileUpload control.

So if you will set it in the page load it will work first time also.

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