ASP.NET SqlDataSource CancelSelectOnNullParameter Property

SqlDataSource CancelSelectOnNullParameter Property
SqlDataSourceCancelSelectOnNullParameter.aspx

<%@ Page Language="C#" AutoEventWireup="true" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
    
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<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>Using CancelSelectOnNullParameter property in SqlDataSource in asp.net</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <h2 style="color:Navy; font-style:italic;">SqlDataSource Example: using CancelSelectOnNullParameter Property</h2>
        <asp:SqlDataSource 
            ID="SqlDataSource1"
            runat="server"
            ConnectionString="<%$ ConnectionStrings:NorthwindConnectionString %>"
            SelectCommand="Select CategoryID, CategoryName From Categories"
            >
        </asp:SqlDataSource>
        <asp:DropDownList 
            ID="DropDownList1"
            runat="server"
            DataSourceID="SqlDataSource1"
            DataValueField="CategoryID"
            DataTextField="CategoryName"
            AppendDataBoundItems="true"
            AutoPostBack="true"
            >
            <asp:ListItem Text="All" Value=""></asp:ListItem>
        </asp:DropDownList>
        <asp:SqlDataSource 
            ID="SqlDataSource2"
            runat="server"
            ConnectionString="<%$ ConnectionStrings:NorthwindConnectionString %>"
            SelectCommand="Select ProductID, ProductName, QuantityPerUnit, UnitPrice From Products Where CategoryID=IsNull(@CategoryID, CategoryID)"
            SelectCommandType="Text"
            CancelSelectOnNullParameter="false"
            >
            <SelectParameters>
                <asp:ControlParameter 
                    Name="CategoryID" 
                    ControlID="DropDownList1" 
                    PropertyName="SelectedValue"
                    ConvertEmptyStringToNull="true"
                    />
            </SelectParameters>
        </asp:SqlDataSource>
        <asp:GridView 
            ID="GridView1"
            runat="server"
            DataSourceID="SqlDataSource2"
            AutoGenerateColumns="true"
            AllowPaging="true"
            PageSize="10"
            BorderColor="Snow"
            Font-Names="Comic Sans MS"
            Width="650"
            >
            <HeaderStyle 
                BackColor="DarkGoldenrod" 
                BorderColor="PeachPuff" 
                ForeColor="Snow" 
                Height="45"/>
            <RowStyle 
                BackColor="Chocolate" 
                ForeColor="Snow" 
                Font-Italic="true" />
            <PagerStyle 
                Height="45" 
                HorizontalAlign="Right" 
                BackColor="OrangeRed"
                Font-Bold="true"
                Font-Size="X-Large"
                ForeColor="Snow"
                />
            <PagerSettings Mode="Numeric" />
        </asp:GridView>
    </div>
    </form>
</body>
</html>
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