How to Set which of the Forms Appear First in Window Application

In your visual studio, when ever you open a project by default program.cs will open.

Static void Main()

{

    Application.EnableVisualStyles();

    Application.SetCompatibleTextRenderingDefault(false);

    Application.Run(new Form1());

}

you can see above Application.Run(new Form1());

Whatever your form name is type there, then whenever you are starting first this form will run.