Why Does My ASP.NET Application Fail to Connect to the Database with Error 'Cannot Open Database 'Test' Requested by Login. Login Failed for User 'xyz\ASPNET''?

Solving the ASP.NET Database Connection Problem: "Cannot Open Database 'Test' Requested by Login. Login Failed for User 'xyzASPNET'"

This error message pops up when your web application tries to connect to a database but fails because the login credentials are insufficient. The user account, 'xyzASPNET', lacks the necessary permissions to access the 'test' database.

Here's how to fix it:

1. Check the User Account: Make sure the 'xyzASPNET' user account actually exists in SQL Server and has the correct permissions to access the database. This account is commonly used by ASP.NET apps to interact with databases.

2. Adjust User Authentication: If you're using integrated Windows authentication ("Integrated Security=True" in your connection string), create a SQL Server login for 'xyzASPNET' and grant it the required database access rights.

3. Provide Explicit Database Credentials: Another solution is to modify your connection string to include specific username and password details. Replace "Integrated Security=True" with:

   <code> UserID=xyz;Password=top$secret;</code>

   Here, 'xyz' is your database username and 'top$secret' is the password.

Example of a Connection String with Explicit Credentials:

<code>connectionString="Server=.\SQLExpress;Database=IFItest;UserID=xyz;Password=top$secret"</code>

By verifying the user account and correctly configuring the authentication method, you should be able to resolve the connection error and successfully connect to your database.

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