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private void button4_Click(object sender, EventArgs e)
{
Form2 f2 = new Form2();
f2.MesEventHandler += F2_MesEventHandler;
f2.Show();
}
private void F2_MesEventHandler(string obj)
{
MessageBox.Show(obj);
}
public event Action<string> MesEventHandler;
private void button1_Click(object sender, EventArgs e)
{
MesEventHandler?.Invoke("OK");
}