bind textbox values in grid in windows

private void button1_Click(object sender, EventArgs e)
      {
       DataTable dtToGrid = new DataTable();
        DataRow drToGrid;
        dtToGrid.Columns.Add(new DataColumn("EMP_ID", typeof(string)));
        dtToGrid.Columns.Add(new DataColumn("EMP_FName", typeof(string)));
        dtToGrid.Rows.Add();
        dtToGrid.Rows[0][0] = txt_empid.Text;
        dtToGrid.Rows[0][1] = txt_fname.Text;

        dataGridView.DataSource = dtToGrid;
      }