顯示圖象
*.aspx
<asp:ButtonColumn Text="<img alt='選擇'src=select.gif border=0 />" CommandName="Select"></asp:ButtonColumn>
*.aspx.cs
		private void DataGrid1_SelectedIndexChanged(object sender, System.EventArgs e)
		{			
			ToggleBitmap(DataGrid1.SelectedItem);
		}
		//選擇改變時則改變圖像
		private void ToggleBitmap(DataGridItem dgi)
		{
			TableCell c = (TableCell)dgi.Controls[0];
			c.Text = "<img src=selected.gif border=0 align=absmiddle>";	
		}