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hey guys i think there is something wrong with my visual studio 2013. my fileupload is not provide any filename ,every time it is giving a null value , previously it was running correctly and upload a file too but now it is not working


i have create fileupload in webpage and a button to test that whether fileupload get a value or not.

<asp:Button ID="Button4" runat="server" OnClick="Button4_Click" Text="Button" />
                            <asp:FileUpload ID="FileUpload3" runat="server" />

protected void Button4_Click(object sender, EventArgs e)
       string fname = "", fn = "";
       fname = FileUpload3.FileName;


in the above simple code variable 'fname' is getting a null value always from fileupload.
what is the problem ? is this a problem with my visual studio?
Updated 17-Dec-14 18:12pm

If you use Updatepanel then copy this code under updatepanel:
<asp:PostBackTrigger ControlID="Button4" />
one posibility is that if you used update panel then fileupload will be become null.
if its not ,then
try to use FileUpload1.PostedFile.FileName;

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