VB.NET Application migrating from SQL Server 2005 to SQL Express

Hi, I am tring to migrate an application that I have written in VB.NET using VS2005, from using a SQL Server 2005 database to a SQL Express database.

Basically I have migrated the database into SQL Express and set up the relevant users, and am trying to use the same connection string with the data source being the only change.

However when running the application, I now get the error.
"Login failed for user 'APPUSER'. The user is not associated with a trusted SQL Server Connection.

The previous login string was
User ID=APPUSER;Password = xxx;Data Source="localhost";Provider="SQLOLEDB.1"

the new login string is
User ID=APPUSER;Password = xxx;Data Source=".\SQLEXPRESS";Provider="SQLOLEDB.1"

Any help to get me going again will be very much appreciated.

Thanks
...Steve
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swtileyAsked:
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imran_fastConnect With a Mentor Commented:
First login to your sql server using sa or windows authentication. then in security expand logins in the left hand object browser then add a new user appuser (if not exists)assign its password after that give it access on the particular datbase

check this link for steps

http://msdn2.microsoft.com/en-us/library/aa337562.aspxc
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imran_fastCommented:
Check the user you have in IIS and check if the APPUSER has access on sql server logins on your database.
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swtileyAuthor Commented:
Hi Imran,

I think you are on the right track, but this is a Windows Application not a Web. However you are right in that if I try and sign into SQL Server Management Studio with the user / login APPUSER,then I get the same message.

Therefore how do I make this user / login associated with a trusted SQL Server Connection

Thanks...
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