Navigation between Forms

Form1 child = new Form1(); //create new isntance of form

child.FormClosed += new FormClosedEventHandler(child_FormClosed); //add handler to catch when child form is closed

child.Show(); //show child

this.Hide(); //hide parent

void child_FormClosed(object sender, FormClosedEventArgs e)
            {
               this.Close();
            }

Some discussions here[^] as well.