gridview行编辑时绑定Dropdownlist并选中对应值

protected void gridView_RowEditing(object sender, GridViewEditEventArgs e)
{
System.Data.DataRowView drv = (System.Data.DataRowView)gridView.Rows[e.NewEditIndex].DataItem;
//索引编辑时
this.gridView.EditIndex = e.NewEditIndex;
this.BindData();
//绑定编辑状态的Dropdownlist数据
DropDownList ddlUserName = (DropDownList)gridView.Rows[gridView.EditIndex].FindControl("ddlUserName");
ddlUserName.DataSource = new BLL.UserBLL().GetList(" UsRo_fk_Ro_ID = 5");
ddlUserName.DataBind();
DropDownList ddlDwName = (DropDownList)gridView.Rows[gridView.EditIndex].FindControl("ddlDwName");
ddlDwName.DataSource = new BLL.DanweiBLL().GetAllList(" Dw_parentID = Dw_ID");
ddlDwName.DataBind();
HiddenField hdfUserName = (HiddenField)gridView.Rows[gridView.EditIndex].FindControl("hdfUserName");
HiddenField hdfDwName = (HiddenField)gridView.Rows[gridView.EditIndex].FindControl("hdfDwName");
//RadioButtonList rbl = (RadioButtonList)e.Row.FindControl("txtGender");
//if (rbl != null)
//{
//  if ((bool)drv["Gender"])
//  {
//    rbl.Items.FindByText("男").Selected = true;
//  }
//  else
//  {
//    rbl.Items.FindByText("女").Selected = true;
//  }
//}

if (ddlUserName != null)
{
ddlUserName.Items.FindByText(hdfUserName.Value).Selected = true;
}
if (ddlUserName != null)
{
ddlDwName.Items.FindByText(hdfDwName.Value).Selected = true;
}
}