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Facing issue with FileUpload Control in WebDialogWindow in updatepanel


I would appreciate it a lot if someone could please help me with this. 

I have an updatepanel which has a button, which when clicked shows the web dialog window, and within that dialog window I have a file upload control and a button upload to save that file.  FileControl.HasFile is always returning false. What way can I work around this?  I have tried using the <Triggers><asp:PostBackTrigger ControlID="" /></Triggers> of the update panel but get an error that it can't find the control. 

I tried registering the PostBackTrigger through code below. It does not give any error but still the HasFile Property return false.

ScriptManager scriptManager = ScriptManager.GetCurrent(this.Page);
if (scriptManager == null)


What is the way to use FileUpload control inside a WebDialogWindow. ? Any help would be really appreciated.

Thanks ,