ShowHideGridViewColumnsServerFull.aspx

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<%@ Page Title="Show / Hide Gridview Columns on the Server Side" Language="C#" MasterPageFile="~/MasterPage.master" AutoEventWireup="true" CodeFile="ShowHideGridViewColumnsServerFull.aspx.cs" Inherits="ShowHideGridViewColumnsServerFull" %>

<asp:Content ID="Content1" ContentPlaceHolderID="HeadContent" Runat="Server">

</asp:Content>

<asp:Content ID="Content2" ContentPlaceHolderID="BodyContent" Runat="Server">
    <h3>Show / Hide Gridview Columns on the Server Side</h3>
    <a class="printHideMe" href="Default.aspx">Back to Menu</a>
    <p class="description">
        Try clicking on the minus symbols in the GridView column headers.
        <br />Use the dropdown list to show the columns again.
        <br />Try "Print Preview" in your browser to see how the page will print.
        <br /><br />This example uses a SqlDataSource control and includes a MasterPage,
        <br />an UpdatePanel and GridView editing, paging and sorting.
        <br />Also, the Id column is hidden by default.
    </p>
    <asp:UpdatePanel ID="UpdatePanel1" runat="server">
        <ContentTemplate> 
            <asp:GridView ID="GridView1" runat="server"
                OnRowCreated="GridView1_RowCreated"
                OnRowCommand="GridView1_RowCommand" 
                DataSourceID="SqlDataSource1" DataKeyNames="Id"
                AllowSorting="True" AllowPaging="True" PageSize="3"
                AutoGenerateColumns="False">
                <HeaderStyle CssClass="gvHeader" />
                <RowStyle CssClass="gvRow" />
                <Columns>
                    <asp:CommandField ShowEditButton="True" />
                    <asp:TemplateField HeaderText="Id" SortExpression="Id">
                        <ItemTemplate>
                            <asp:Label ID="IdLabel" runat="server" Text='<%# Eval("Id") %>'></asp:Label>
                        </ItemTemplate>   
                        <EditItemTemplate>
                            <asp:Label ID="Id" runat="server" Text='<%# Bind("Id") %>'></asp:Label>
                        </EditItemTemplate>            
                    </asp:TemplateField>                    
                    <asp:TemplateField HeaderText="Description" SortExpression="Description">
                        <ItemTemplate>
                            <asp:Label ID="DescriptionLabel" runat="server" Text='<%# Eval("Description") %>'></asp:Label>
                        </ItemTemplate>   
                        <EditItemTemplate>
                            <asp:TextBox ID="Description" runat="server" Text='<%# Bind("Description") %>' Width="175px"></asp:TextBox>
                        </EditItemTemplate>            
                    </asp:TemplateField>                    
                    <asp:TemplateField HeaderText="Assigned To" SortExpression="AssignedTo">
                        <ItemTemplate>
                            <asp:Label ID="AssignedToLabel" runat="server" Text='<%# Eval("AssignedTo") %>'></asp:Label>
                        </ItemTemplate>
                        <EditItemTemplate>
                            <asp:DropDownList ID="AssignedTo" runat="server" SelectedValue='<%# Bind("AssignedTo") %>'>
                                <asp:ListItem></asp:ListItem>
                                <asp:ListItem>Andy</asp:ListItem>
                                <asp:ListItem>Betty</asp:ListItem>
                                <asp:ListItem>Conor</asp:ListItem>
                                <asp:ListItem>Declan</asp:ListItem>
                                <asp:ListItem>Eamon</asp:ListItem>
                                <asp:ListItem>Fergal</asp:ListItem>
                                <asp:ListItem>Gordon</asp:ListItem>
                                <asp:ListItem>Helen</asp:ListItem>