GridView中给DropDownList动态绑定数据，及选择列表值后自动更新数据库

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protected void sgvFile1_RowDataBound(object sender, GridViewRowEventArgs e)

{ 
    DropDownList ddlAM = ((DropDownList)e.Row.FindControl("ddlAM"));

    ddlAM.SelectedIndexChanged += new EventHandler(ddlAM_SelectedIndexChanged);

    ddlAM.SelectedIndex = -;

    ddlAM.Items.FindByValue(labAM.Text).Selected = true;

}

protected void ddlAM_SelectedIndexChanged(object sender, EventArgs e)

    {

        DropDownList ddlAM = (DropDownList)sender;

        string i = ddlAM.ID.Substring(ddlAM.ID.LastIndexOf("ddlAM") + , ddlAM.ID.Length - );

        bool flage = false;

        GridViewRow row = (GridViewRow)ddlAM.NamingContainer;

        Label labAMPersonID = (Label)row.FindControl("labAMPersonID" + i);

        try

        {

            UpdateKaoQin(labAMPersonID.Text, ddlAM.SelectedValue);

        }

        catch

        {

            ScriptManager.RegisterClientScriptBlock(UpdatePanel1, typeof(UpdatePanel), "result", "alert('修改失败！');", true);

        }

    }