Why Does Entity Framework 4.1 Throw 'The Provider Did Not Return a ProviderManifestToken String'?

Entity Framework 4.1 Error: "The Provider Did Not Return a ProviderManifestToken String"

When attempting to utilize Entity Framework in an ASP.NET project, an error has been encountered: "The provider did not return a ProviderManifestToken string." This has prevented the creation of the database.

Problem Details

The provided connection string indicates an attempt to access a database located at ".SQLExpress;initial catalog=NewTestDB;integrated security=True;" using the "System.Data.SqlClient" provider. The code attempts to add entities to the "Patients" and "LabResults" tables, and saves the changes.

Resolution

After examining the error's Inner Exception, it was discovered that the issue stemmed from an unsuccessful SQL login attempt for the specified user.

Suggested Action

To resolve this issue, verify the credentials provided for accessing the database. Ensure that the user has the necessary permissions to connect and create the database.

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