Upload your selected fie on server

private void btnUploadFile_Click(object sender, EventArgs e)

{

try

       {

              if (FileUpLoad1.HasFile)

              {

                     //Here "upload" is a folder on server in which uploaded file will be stored...

FileUpLoad1.SaveAs(Server.MapPath("upload") + "\\" + FileUpLoad1.FileName);

}

}

       catch (Exception ex)

       {

              //If any error or exception will occur then it will display that message…

              MessageBox.Show(ex.ToString());

}

}