How to use FormView ItemTemplate and Eval() in asp.net

asp.net FormView example: how to use ItemTemplate, Eval()
FormViewExample.aspx

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

<!DOCTYPE html>

<script runat="server">

</script>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>asp.net FormView example: how to use ItemTemplate, Eval()</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <h2 style="color:Teal">FormView ItemTemplate Example</h2>
        <asp:SqlDataSource 
            ID="SqlDataSource1"
            runat="server"
            ConnectionString="<%$ ConnectionStrings:NorthwindConnectionString %>"
            SelectCommand="SELECT CustomerID, CompanyName FROM Customers"
            >
        </asp:SqlDataSource>
        <asp:DropDownList 
            ID="DropDownList1"
            runat="server"
            DataSourceID="SqlDataSource1"
            DataTextField="CompanyName"
            DataValueField="CustomerID"
            AutoPostBack="true"
            >
        </asp:DropDownList>
        <asp:SqlDataSource 
            ID="SqlDataSource2"
            runat="server"
            ConnectionString="<%$ ConnectionStrings:NorthwindConnectionString %>"
            SelectCommand="SELECT CustomerID, CompanyName, ContactName, ContactTitle, Address FROM Customers WHERE CustomerID=@CustomerID"
            >
            <SelectParameters>
                <asp:ControlParameter ControlID="DropDownList1" Name="CustomerID" PropertyName="SelectedValue" />
            </SelectParameters>
        </asp:SqlDataSource>
        <br /><br />
        <asp:Panel ID="Panel1" runat="server" ForeColor="Crimson">
            <asp:FormView ID="FormView1" runat="server" DataSourceID="SqlDataSource2">
                <ItemTemplate>
                    <i>
                    <b>Customer ID: </b>
                    <%# Eval("CustomerID") %>
                    <br />
                    <b>Company Name: </b>
                    <%# Eval("CompanyName") %>
                    <br />
                    <b>Contact Name: </b>
                    <%# Eval("ContactName") %>
                    <br />
                    <b>Contact Title: </b>
                    <%# Eval("ContactTitle") %>
                    <br />
                    <b>Address: </b>
                    <%# Eval("Address") %>
                    </i>
                </ItemTemplate>
            </asp:FormView>
        </asp:Panel>
    </div>
    </form>
</body>
</html>
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