Can not connect to dataase "test.mdf" .login failed for the user ''''''''''. with Windows authentication,SQLserver

This is the error we face, when we are normally try to connect with database(SQLserver )  under windows authentication.

Solution:

Check for your login under SECURITY folder in SQLSERVER object explorer.

If the login found,then mention the username and password in CONNECTION string as below

<add key="connectionString" value="Data Source=.\SQLSERVER;Initial Catalog=TestDB;;Integrated Security=True;user id=sa;password=123456/>


For more details about connections, go with the below 

linkhttp://www.connectionstrings.com/sql-server-2012