How can I exchange data between forms [duplicate]

Answer 1

You could do something like the following. It assumes that you've created a form called SomeForm and have added a constructor that accepts a string to it.

    public partial class LoginForm : Form
    {
        private string somedata = "somedata";

        public LoginForm()
        {
            InitializeComponent();

            OpenForm(somedata);
        }    
    }

    private void OpenForm(string Data)
    {
        SomeForm sf = new SomeForm(Data);
        sf.Show();
    }