need help!! please.. :'( Different User Accessing Different Form in C#

if((username.Equals("a") == true) && (password.Equals("a") == true))
{
    var newForm2 = new Form2();
    newForm2.Show();
}
if((username.Equals("b") == true) && (password.Equals("b") == true))
{
    var newForm3 = new Form3();
    newForm3.Show();
}

I'm not exactly sure what you're looking for, but will something like this help? I could be wrong ... I'm not quite sure what your question is.