I have an ASP.NET 2.0 site i'm creating in VS.NET.  I left it a few days
ago, after I had implemented membership, worked on some db tables, etc...

Today I go to open the Data Connection to the SQL Express db thru the VS
interface and I get this error:

An error has occurred while establishing a connection to the server.  When
connection to SQL Server 2005, this failure may be caused by the fact that
under the default settings SQL Server does not allow remote connections
(provider: SQL Network Interfaces, error: 26 - Erro Locating Server/Instance
Specified)

I hit OK and the db does not show up.

Any ideas what could be causing this?

Does it matter in my web.config that I added this?
   <membership defaultProvider="CustomizedProvider">
     <providers>
       <add name="CustomizedProvider"
            type="System.Web.Security.SqlMembershipProvider"
            connectionStringName="LocalSqlServer"
            applicationName="/"
            minRequiredPasswordLength="5"
            minRequiredNonalphanumericCharacters="0" />
     </providers>
   </membership>

The LocalSqlServer is defined in the web.config as this:
 <connectionStrings>
   <remove name="LocalSqlServer" />
   <add name="LocalSqlServer" connectionString="Data
Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\ASPNETDB.MDF;Integrated
Security=True;User Instance=True"
     providerName="System.Data.SqlClient" />
 </connectionStrings>