How to Open Window Dialog of Client to select File

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ASP.NET

Dear All

I want to open a window dialog for selection of file on client PC using asp.net without using server control file brows..

I m Also Use this Code

protected void btntft_Click(object sender, EventArgs e)
{
String Location = String.Empty;
OpenFileDialog frm = new OpenFileDialog();
frm.Filter = "";
frm.Title = "Browse Config file";
//frm.InitialDirectory = "D:\\";
DialogResult ret = STAShowDialog(frm);


}
private DialogResult STAShowDialog(FileDialog dialog)
{
DialogState state = new DialogState();
state.dialog = dialog;
System.Threading.Thread t = new System.Threading.Thread(state.ThreadProcShowDialog);
t.SetApartmentState(System.Threading.ApartmentState.STA);
t.Start();
t.Join();
return state.result;
}
public class DialogState
{

public DialogResult result;
public FileDialog dialog;
public void ThreadProcShowDialog()
{
result = dialog.ShowDialog();
}
}

But Its Not being work on IIS Server

Please help how can I call
Thanks