bugnuker bugnuker - 1 year ago 78
SQL Question

EF 4.1 exception "The provider did not return a ProviderManifestToken string"

I am trying to replicate an example found on MSDN. I am using ASP.NET and EF 4.1 (CTP?). I've used NuGet to install the EntityFramework package.

I am getting this error:

The provider did not return a ProviderManifestToken string
and the database is never created.

Here is my connection string:

<add name="HospitalContext"
"data source=.\SQLExpress;initial catalog=NewTestDB;integrated security=True;"

Here is my code:

var pat = new Patient { Name = "Shane123132524356436435234" };

var labResult = new LabResult { Result = "bad", Patient = pat };

int recordAffected = db.SaveChanges();

Here is my context:

public class HospitalContext : DbContext
static HospitalContext()
Database.SetInitializer(new HostpitalContextInitializer());

public DbSet<Patient> Patients { get; set; }
public DbSet<LabResult> LabResults { get; set; }

public class HostpitalContextInitializer :
protected override void Seed(HospitalContext context)
context.Patients.Add(new Patient { Name = "Fred Peters" });
context.Patients.Add(new Patient { Name = "John Smith" });
context.Patients.Add(new Patient { Name = "Karen Fredricks" });

This is a fully patched SQL 2008 system, with VS 2010 SP1.

Answer Source

I was getting this error and tried a few of the earlier suggestions. Then I checked the Inner Exception and noticed I was getting a simple SQL login failure for the user. Just something else to check.

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