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Listing 11.21 - ShowButtonField.aspx

Illustrates how to use a ButtonField field when using an ASP.NET GridView control.

Listing 11.21 - ShowButtonField.aspx (C#)
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<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<script runat="server">

    protected void grdMovieCategories_RowCommand(object sender, GridViewCommandEventArgs e)
    {
        int index = Int32.Parse((string)e.CommandArgument);
        int id = (int)grdMovieCategories.DataKeys[index].Values["Id"];
        int position = (int)grdMovieCategories.DataKeys[index].Values["Position"];
        switch (e.CommandName)
        {
            case "Up":
                position--;
                break;
            case "Down":
                position++;
                break;
        }
        srcMovieCategories.UpdateParameters["Id"].DefaultValue = id.ToString();
        srcMovieCategories.UpdateParameters["Position"].DefaultValue = position.ToString();
        srcMovieCategories.Update();
    }
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>Show ButtonField</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
    <asp:GridView
        id="grdMovieCategories"
        DataSourceID="srcMovieCategories"
        DataKeyNames="Id,Position"
        AutoGenerateColumns="false"
        OnRowCommand="grdMovieCategories_RowCommand"
        Runat="server">
        <Columns>
        <asp:ButtonField
            Text="Move Up"
            CommandName="Up" />
        <asp:ButtonField
            Text="Move Down"
            CommandName="Down" />
        <asp:BoundField
            DataField="Position"
            HeaderText="Position" />
        <asp:BoundField
            DataField="Name"
            HeaderText="Category Name" />
        </Columns>
    </asp:GridView>    
    
    <asp:SqlDataSource
        id="srcMovieCategories"
        ConnectionString="<%$ ConnectionStrings:Movies %>"
        SelectCommand="SELECT Id, Name, Position FROM MovieCategories
            ORDER BY Position"
        UpdateCommand="UPDATE MovieCategories SET
            Position=@Position WHERE Id=@Id"
        Runat="server">
        <UpdateParameters>
        <asp:Parameter
            Name="Id" />
        <asp:Parameter
            Name="Position" />
        </UpdateParameters>
    </asp:SqlDataSource>        
    
    </div>
    </form>
</body>
</html>