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Image upload not working in updatepanel

Posted By:      Posted Date: September 04, 2010    Points: 0   Category :ASP.Net
Hi, in my update panel i need to upload a image.my Fileupload control within update panel.so when i check is it correct format or not in following code then it always take else part. Dim fileUpload1 As FileUpload = CType(Me.FindControl("FileUpload1"), FileUpload)            'Make sure a file has been successfully uploaded            If fileUpload1.PostedFile Is Nothing OrElse String.IsNullOrEmpty(fileUpload1.PostedFile.FileName) OrElse fileUpload1.PostedFile.InputStream Is Nothing Then                Label1.Text = "Please Upload Valid picture file"                Exit Sub            End If            'Make sure we are dealing with a JPG or GIF file            Dim extension As String = System.IO.Path.GetExtension(fileUpload1.PostedFile.FileName).ToLower()            Dim MIMEType As String = Nothing            Select Case exte

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