if and else for visible form [closed]

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i have this code but return error

private void formshow_Click(object sender, EventArgs e)
        {
           if (form1.Visible)                
               {
                   MessageBox.Show("This form is visible");
               }
           else
               {
                   Form2 f = new Form2();
                   f.Show();
               } 
        }

help me please

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Is form1 the type of the current instance? If so, change if (form1.Visible) to if (this.Visible) or simply if (Visible).