Can't get fullpath from fileUpload control asp.net

[slikk887]

I have a fileUpload and hidden field at aspx file.\[code\]<asp:FileUpload ID="fuID" runat="server" ToolTip="Select Only Excel File" /><asp:Button runat="server" ID="btnUl" OnClientClick="document.getElementById('myHiddenInput').value =http://stackoverflow.com/questions/15491639/document.getElementById('fuID').value" OnClick="btnUlClick" Text="Upload" /><asp:HiddenField id="myHiddenInput" runat="server" />\[/code\]When I use this code for get fullpath:\[code\]string abc = myHiddenInput.Value;//Show fullpathstring filepath =null;if(fuID.HasFile)filepath = fuID.PostedFile.FileName.ToString();//Show fullpath\[/code\]All of these code show fullPath when I use IE.But when I use FF,It didn't show fullPath,Just show FileName from FileUpload.Anybody help me?Thanks,