在UltraWebGrid单元格中绑定dropdownlist

protected void UltraWebGrid1_InitializeRow(object sender, Infragistics.WebUI.UltraWebGrid.RowEventArgs e)
{
SqlConnection con = new SqlConnection(AccessBase.connStr);
SqlDataAdapter da = new SqlDataAdapter("select * from dbo.FeedBackType", con);
DataSet ds = new DataSet();
da.Fill(ds);
Infragistics.WebUI.UltraWebGrid.UltraGridColumn col = this.UltraWebGrid1.Columns.FromKey("MessageType");
//col.CellStyle.BackColor = Color.LightCyan;
col.AllowUpdate = Infragistics.WebUI.UltraWebGrid.AllowUpdate.Yes;
col.Type = Infragistics.WebUI.UltraWebGrid.ColumnType.DropDownList;
Infragistics.WebUI.UltraWebGrid.ValueList vl = new Infragistics.WebUI.UltraWebGrid.ValueList();
vl.DataSource = ds;
vl.DisplayMember = "MessageType";
vl.ValueMember = "MessageType";
vl.DataBind();
col.ValueList = vl;
}