use of unassigned local varible 'form2'

[LeonXie]

private void toolStripButton1_Click(object sender, EventArgs e)
        {
            Form2 form2;
            if (form2 == null || form2.IsDisposed)
            {
                form2 = new Form2();
                form2.MdiParent = this;
                form2.Show();
            }
            else
            {
                form2.Activate();
            }
        }

[GaryTexmo]

I think it's complaining because you're defining form2, then checking if it will equal null.

In your case, form2 will never not be null. Either make form2 a class member or a parameter of some kind.

[LeonXie]

Thanks!
I'll try it.