How do I get the username of the currently logged in database user in C#

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C#

I'm writing code in C# and I need to have the username of the current user as stored in a software database table against which users must authenticate before logging in .

I've tried
Environment.Username but what this does is take the currently logged in Windows OS User.

What I have tried:

comboBox1.enabled= false;
comboBox1.Text = Environment. Username.ToString ();