สอบถามครับ ว่า เวลาเราจะกำหนดให้ radio button ใน gridview ให้เลือกได้แค่อันเดียวกำหนดอย่างไรครับ

Private Sub Grid_RowDataBound(sender As [Object], e As GridViewRowEventArgs)
	If e.Row.RowType = DataControlRowType.DataRow Then
		Dim group As Group = DirectCast(e.Row.DataItem, Group)
		Dim holder As PlaceHolder = DirectCast(e.Row.FindControl("_holder"), PlaceHolder)
		Dim innerhtml As [String] = [String].Format("<input type='radio' name='sample' value='{0}'>", group.Id)
		holder.Controls.Add(TemplateControl.ParseControl(innerhtml))
	End If
End Sub

  private void Grid_RowDataBound( Object sender, GridViewRowEventArgs e )
  {
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
      Group group = (Group)e.Row.DataItem;
      PlaceHolder holder = (PlaceHolder)e.Row.FindControl("_holder");
      String innerhtml = String.Format("<input type='radio' name='sample' value='{0}'>", group.Id);
      holder.Controls.Add(TemplateControl.ParseControl(innerhtml));
    }
  }