CSharp Using Datareader Mode For Executing Sql Statement – ADO.Net Database

<%@ Page Language="C#" %>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Using the DataReader mode for executing a SQL Statement</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:SqlDataSource ID="categoriesSource"
                           runat="server"
                           ProviderName="System.Data.SqlClient"
                           DataSourceMode="DataReader"
                           ConnectionString="<%$ ConnectionStrings:AdventureWorks %>"
                           SelectCommand="Select ProductSubcategoryID, Name from Production.ProductSubcategory">
        </asp:SqlDataSource>
        Categories:
        <asp:DropDownList runat="server"
                          DataSourceID="categoriesSource"
                          DataValueField="ProductSubcategoryID"
                          DataTextField="Name"
                          AutoPostBack="true"
                          ID="lstCategories" />
        <asp:SqlDataSource ID="productsSource"
                           runat="server"
                           ProviderName="System.Data.SqlClient"
                           DataSourceMode="DataReader"
                           ConnectionString="<%$ ConnectionStrings:AdventureWorks %>"
                           SelectCommand="Select ProductID, Name, ProductNumber, StandardCost from Production.Product Where ProductSubcategoryID=@ProductSubcategoryID">
            <selectParameters>
                <asp:ControlParameter
                     ControlID="lstCategories"
                     Name="ProductSubcategoryID"
                     PropertyName="SelectedValue" />
            </selectParameters>
        </asp:SqlDataSource>
        <asp:GridView runat="server" DataSourceID="productsSource"
            HeaderStyle-HorizontalAlign="Center" HeaderStyle-Font-Bold="True"
            HeaderStyle-BackColor="blue" HeaderStyle-ForeColor="White" />
    </div>
    </form>
</body>
</html>
File: Web.config<configuration>
  <appSettings/>
  <connectionStrings>
        <add name="AdventureWorks"
             connectionString="Data Source=localhost\SQLEXPRESS;Initial Catalog=AdventureWorks;Integrated Security=True"
             providerName="System.Data.SqlClient" />
    </connectionStrings>
  <system.web>
    <compilation debug="true" strict="false" explicit="true">
      <codeSubDirectories>
        <add directoryName="VB"></add>
        <add directoryName="CS"></add>
      </codeSubDirectories>
    </compilation>
    <pages>
      <namespaces>
        <clear/>
        <add namespace="System"/>
        <add namespace="System.Collections"/>
        <add namespace="System.Collections.Specialized"/>
        <add namespace="System.Configuration"/>
        <add namespace="System.Text"/>
        <add namespace="System.Text.RegularExpressions"/>
        <add namespace="System.Web"/>
        <add namespace="System.Web.Caching"/>
        <add namespace="System.Web.SessionState"/>
        <add namespace="System.Web.Security"/>
        <add namespace="System.Web.Profile"/>
        <add namespace="System.Web.UI"/>
        <add namespace="System.Web.UI.WebControls"/>
        <add namespace="System.Web.UI.WebControls.WebParts"/>
        <add namespace="System.Web.UI.HtmlControls"/>
      </namespaces>
    </pages>
    <authentication mode="Windows"></authentication>
    <identity impersonate="true"/>
  </system.web>
</configuration>

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