<%@ Page Language="VB" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>EmptyDataTemplate, NullDisplayText, DefaultValue, and ConvertEmptyStringToNull</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<strong>View contacts that begin with:</strong><br />
<br />
<asp:ListBox AutoPostBack="True" ID="ListBox1" runat="server" Width="114px">
<asp:ListItem Selected="true">A</asp:ListItem>
<asp:ListItem>B</asp:ListItem>
<asp:ListItem>C</asp:ListItem>
<asp:ListItem>D</asp:ListItem>
<asp:ListItem>E</asp:ListItem>
<asp:ListItem>F</asp:ListItem>
<asp:ListItem>G</asp:ListItem>
<asp:ListItem>H</asp:ListItem>
<asp:ListItem>I</asp:ListItem>
<asp:ListItem>J</asp:ListItem>
<asp:ListItem>K</asp:ListItem>
<asp:ListItem>L</asp:ListItem>
<asp:ListItem>M</asp:ListItem>
<asp:ListItem>N</asp:ListItem>
<asp:ListItem>O</asp:ListItem>
<asp:ListItem>P</asp:ListItem>
<asp:ListItem>Q</asp:ListItem>
<asp:ListItem>R</asp:ListItem>
<asp:ListItem>S</asp:ListItem>
<asp:ListItem>T</asp:ListItem>
<asp:ListItem>U</asp:ListItem>
<asp:ListItem>V</asp:ListItem>
<asp:ListItem>W</asp:ListItem>
<asp:ListItem>X</asp:ListItem>
<asp:ListItem>Y</asp:ListItem>
<asp:ListItem>Z</asp:ListItem>
</asp:ListBox><br />
<br />
<asp:DetailsView AutoGenerateRows="False" DataKeyNames="CustomerID" DataSourceID="SqlDataSource1"
Height="50px" ID="DetailsView1" runat="server" Width="315px" AllowPaging="True">
<Fields>
<asp:BoundField DataField="ContactName" HeaderText="ContactName" SortExpression="ContactName" ReadOnly="true" />
<asp:BoundField DataField="ContactTitle" HeaderText="ContactTitle" SortExpression="ContactTitle" />
<asp:BoundField DataField="Region" HeaderText="Region" NullDisplayText="(NA)" SortExpression="Region" />
<asp:BoundField DataField="Phone" HeaderText="Phone" NullDisplayText="not listed"
SortExpression="Phone" />
<asp:BoundField DataField="Fax" HeaderText="Fax" NullDisplayText="not listed" SortExpression="Fax" />
<asp:CommandField ShowEditButton="True" />
</Fields>
<EmptyDataTemplate>
<asp:Image ID="Image1" runat="server" ImageUrl="~/Images/warning.gif" />There are no records to display
</EmptyDataTemplate>
</asp:DetailsView>
<asp:SqlDataSource ConnectionString="<%$ ConnectionStrings:Northwind %>" ID="SqlDataSource1"
runat="server" SelectCommand="SELECT [CustomerID], [ContactName], [ContactTitle], [Region], [Phone], [Fax] FROM [Customers] WHERE ([ContactName] LIKE + @ContactName + '%')"
UpdateCommand="UPDATE [Customers] SET [ContactTitle] = @ContactTitle, [Region] = @Region, [Phone] = @Phone, [Fax] = @Fax WHERE [CustomerID] = @CustomerID">
<UpdateParameters>
<asp:Parameter Name="ContactName" Type="String" />
<asp:Parameter Name="ContactTitle" Type="String" DefaultValue="Owner" ConvertEmptyStringToNull="true" />
<asp:Parameter Name="Region" Type="String" ConvertEmptyStringToNull="true" />
<asp:Parameter Name="Phone" Type="String" ConvertEmptyStringToNull="true" />
<asp:Parameter Name="Fax" Type="String" ConvertEmptyStringToNull="true" />
<asp:Parameter Name="CustomerID" Type="String" />
</UpdateParameters>
<SelectParameters>
<asp:ControlParameter ControlID="ListBox1" Name="ContactName" PropertyName="SelectedValue"
Type="String" />
</SelectParameters>
</asp:SqlDataSource>
</div>
</form>
</body>
</html>
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