CSharp Executing Insert, Update, And Delete Commands – ADO.Net Database

<%@ 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 btnAddEntry_Click(object sender, EventArgs e)
    {
        srcGuestBook.InsertParameters["Name"].DefaultValue = txtName.Text;
        srcGuestBook.InsertParameters["Comments"].DefaultValue = txtComments.Text;
        srcGuestBook.Insert();
    }
</script><html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>Execute Insert</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <asp:Label
        id="lblName"
        Text="Name:"
        AssociatedControlId="txtName"
        Runat="server" />
    <asp:TextBox
        id="txtName"
        Runat="server" />
    <asp:Label
        id="lblComments"
        Text="Comments:"
        AssociatedControlId="txtComments"
        Runat="server" />
    <asp:TextBox
        id="txtComments"
        TextMode="MultiLine"
        Columns="50"
        Rows="2"
        Runat="server" />
    <asp:Button
        id="btnAddEntry"
        Text="Add Entry"
        Runat="server" OnClick="btnAddEntry_Click" />
    <asp:GridView
        id="grdGuestBook"
        DataSourceId="srcGuestBook"
        Runat="server" />
    <asp:SqlDataSource
        id="srcGuestBook"
        ConnectionString="<%$ ConnectionStrings:GuestBook %>"
        SelectCommand="SELECT Name,Comments FROM GuestBook
            ORDER BY Id DESC"
        InsertCommand="INSERT GuestBook (Name,Comments)
            VALUES (@Name,@Comments)"
        Runat="server">
        <insertParameters>
            <asp:Parameter Name="Name" />
            <asp:Parameter Name="Comments" />
        </insertParameters>
    </asp:SqlDataSource>
    </div>
    </form>
</body>
</html>File: Web.config<configuration>
  <connectionStrings>
    <add name="GuestBook"
         connectionString="Data Source=.\SQLEXPRESS;
         AttachDbFilename=|DataDirectory|MyDatabase.mdf;Integrated Security=True;User Instance=True" />
  </connectionStrings>
</configuration>

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