Using the Null value : GridView « Data Binding « ASP.NET Tutorial
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Untitled Page</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:GridView ID="GridView1"
Runat="server"
DataSourceID="SqlDataSource1"
DataKeyNames="CustomerID"
AutoGenerateColumns="False"
AllowSorting="True"
AllowPaging="True"
PageSize="10">
<PagerStyle HorizontalAlign="Center"></PagerStyle>
<PagerSettings Position="TopAndBottom"
FirstPageText="Go to the first page"
LastPageText="Go to the last page"
Mode="NextPreviousFirstLast">
</PagerSettings>
<Columns>
<asp:BoundField ReadOnly="True"
HeaderText="CustomerID"
DataField="CustomerID"
SortExpression="CustomerID"/>
<asp:BoundField HeaderText="CompanyName"
DataField="CompanyName"
SortExpression="CompanyName"/>
<asp:BoundField HeaderText="ContactName"
DataField="ContactName"
SortExpression="ContactName"/>
<asp:BoundField HeaderText="ContactTitle"
DataField="ContactTitle"
SortExpression="ContactTitle"/>
<asp:BoundField HeaderText="Address"
DataField="Address"
SortExpression="Address"/>
<asp:BoundField HeaderText="City"
DataField="City"
SortExpression="City"/>
<asp:BoundField HeaderText="Region"
NullDisplayText="N/A"
DataField="Region"
SortExpression="Region"/>
<asp:BoundField HeaderText="PostalCode"
DataField="PostalCode"
SortExpression="PostalCode"/>
<asp:BoundField HeaderText="Country"
DataField="Country"
SortExpression="Country"/>
<asp:BoundField HeaderText="Phone"
DataField="Phone"
SortExpression="Phone"/>
<asp:BoundField HeaderText="Fax"
DataField="Fax"
SortExpression="Fax"/>
</Columns>
</asp:GridView>
<asp:SqlDataSource ID="SqlDataSource1"
Runat="server"
SelectCommand="SELECT * FROM [Customers]"
ConnectionString="<%$ ConnectionStrings:AppConnectionString1 %>"
DataSourceMode="DataSet"
ConflictDetection="CompareAllValues" EnableCaching="True"
CacheKeyDependency="MyKey"
CacheDuration="Infinite">
</asp:SqlDataSource>
</div>
</form>
</body>
</html>
File: Web.config
<configuration>
<appSettings/>
<connectionStrings>
<add name="AppConnectionString1"
connectionString="Data Source=localhost\SQLEXPRESS;Initial Catalog=Northwind;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>