public static InpSp GetForm(Form f1, string str)
{
if (f == null || f.IsDisposed)
{
f = new InpSp(f1, str);
}
return(f);
}
private void button10_Click(object sender, EventArgs e)
{
Form f3 = InpSp.GetForm(this, str);
f3.Show();
}