使用下拉列表从gridview中删除选定的行

Question

我正在使用gridview并在gridview中使用下拉列表。

<div class="container" style="padding-right: 15px; padding-left: 15px; margin-top:auto">
    <br /><br /><br />
    <asp:GridView ID="grdUser" runat="server" AllowPaging="True" AllowSorting="True" CaptionAlign="Left" OnPageIndexChanging="grdUser_PageIndexChanging" OnSorting="grdUser_Sorting" PageSize="5" CssClass="table table-hover table-striped table-responsive">
        <AlternatingRowStyle BackColor="#9999FF" />
        <HeaderStyle BackColor="#009933" Font-Bold="True" Font-Size="Medium" HorizontalAlign="Center" VerticalAlign="Middle" />
        <PagerSettings FirstPageText="First" Mode="NumericFirstLast" LastPageText="Last" PageButtonCount="4" NextPageText="" />
        <PagerStyle BackColor="#FFFF66" HorizontalAlign="Right" VerticalAlign="Middle" ForeColor="Black" />
        <Columns>
            <asp:TemplateField>
                <ItemTemplate>
                    <asp:DropDownList ID="ddlAct" runat="server" OnSelectedIndexChanged="ddlAct_SelectedIndexChanged">
                        <asp:ListItem Value="Action">Action</asp:ListItem>
                        <asp:ListItem Value="Activate">Activate</asp:ListItem>
                        <asp:ListItem Value="Block">Block</asp:ListItem>
                        <asp:ListItem Value="Delete">Delete</asp:ListItem>
                    </asp:DropDownList>
                </ItemTemplate>
            </asp:TemplateField>
        </Columns>
    </asp:GridView>

</div>

好的，所以现在我想在特定行上隐藏网格中选定的行。

代码是：

 public void GetDataTable()
{

    string CS = ConfigurationManager.ConnectionStrings["FacebookConnectionString1"].ConnectionString;
    using (SqlConnection con = new SqlConnection(CS))
    {
        using (SqlCommand cmd = new SqlCommand())
        {

            cmd.Connection = con;
            cmd.CommandText = "select F_Name AS [First Name], S_Name AS [Surname], E_Mail AS [Email], Day+'-'+Month+'-'+Year AS [Birthday], Gender AS [Gender] from Users Order By F_Name";
            cmd.CommandType = CommandType.Text;
            if (con.State == ConnectionState.Closed)
                con.Open();
            SqlDataReader dr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
            dt.Clear();
            dt.Load(dr);

            grdUser.DataSource = dt;
            grdUser.DataBind();
            cmd.Dispose();
            con.Close();
        }

    }
}

用于下拉选择索引更改我必须做什么？请帮帮我。

protected void ddlAct_SelectedIndexChanged(object sender, EventArgs e)
{
 // what i'll be doing here ?   
}