private void button3_Click(object sender, EventArgs e)
{
using (Theory newForm = new Theory())
{
newForm.ShowDialog();
}
}
private void theoryButton_Click(object sender, EventArgs e)
{
this.Hide();
Theory theory = new Theory();
theory.Closed += (o, args) =>
{
Show();
theory.Dispose();
};
theory.Show();
}