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SQL connections with either Windows or SQL Authentication in VB.net

Last Modified: 2015-03-03
Several years ago, I had developed a VB.NET application that attaches to SQL Server with Windows Authentication that we use at our company.  Recently, I was asked to add a user who is in a non-trusted domain.  I have changed the SQL Server authentication to mixed mode and added the person in Security->Logins and Database->Security->Users.  But honestly, I have no idea what to do next.  I am by no means a professional programmer, but I do have a decent understanding of VB and SQL.  

I really don't want to add a uid and password in an additional connection string in the app.config.  

What I would like to do is have the application check for authentication on load.  If the user has Windows authentication, proceed normally.  If the user has SQL authentication, go to a login screen.  

But I will be happy to entertain other suggestions.  

Any help would be appreciated. Any code snippets would be helpful too.
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