private void Form1_Click4(object sender, EventArgs e)
{
foreach (Form form in Application.OpenForms)
{
if (form.GetType() == typeof(Form7))
{
form.Activate();
return;
}
// button2.Visible = false;
}
//button2.Visible = true;
Form newForm = new Form7();
newForm.BackColor = Color.Wheat;
newForm.MdiParent = this;
newForm.Show();
}