เรียก connect จาก web config ปรากฏว่า datasource ไม่มีค่าอะไรกลับมา จะต้องเพิ่มเติมอะไรอีกบ้างครับ

<?xml version="1.0"?>
<!--
  For more information on how to configure your ASP.NET application, please visit
  http://go.microsoft.com/fwlink/?LinkId=169433
  -->
<configuration>
	<connectionStrings>  
		<add name="ApplicationServices" connectionString="data source=.\SQLEXPRESS;Integrated Security=SSPI;AttachDBFilename=|DataDirectory|\Datasat.mdf;User Instance=true" providerName="System.Data.SqlClient"/>    
	</connectionStrings>
	<system.web>
		<compilation debug="true" strict="false" explicit="true" targetFramework="4.0"/>
		<authentication mode="Forms">
			<forms loginUrl="~/Account/Login.aspx" timeout="2880"/>
		</authentication>
		<membership>
			<providers>
				<clear/>
				<add name="AspNetSqlMembershipProvider" type="System.Web.Security.SqlMembershipProvider" connectionStringName="ApplicationServices" enablePasswordRetrieval="false" enablePasswordReset="true" requiresQuestionAndAnswer="false" requiresUniqueEmail="false" maxInvalidPasswordAttempts="5" minRequiredPasswordLength="6" minRequiredNonalphanumericCharacters="0" passwordAttemptWindow="10" applicationName="/"/>
			</providers>
		</membership>
		<profile>
			<providers>
				<clear/>

string strConnection = System.Configuration.WebConfigurationManager.ConnectionStrings["ApplicationServices"].ConnectionString;