Check out example codes for "c# open a new form and close current". It will help you in understanding the concepts better.

Code Example 1

this.Hide();
    var form2 = new Form2();
    form2.Closed += (s, args) => this.Close(); 
    form2.Show();

Code Example 2

{
    this.Hide();
    Form1 f1 = new Form1();
    f1.ShowDialog();
    this.Close();
}

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