private void LoadData_dlg_FileOk(object sender, CancelEventArgs e)
 {
     if (!(LoadData_dlg.FileName.EndsWith("txt") || (LoadData_dlg.FileName.EndsWith("csv"))))
     {
         //RadMessageBox message=new RadMessageBox()
         //message
         LoadData_dlg.ShowDialog();
     }
 }
 private void LoadData_btn_Click(object sender, EventArgs e)
 {
     LoadData_dlg.ShowDialog();
 }