These methods are used in Window applications to call one form from another
example: we have Form1 and we want to call Form2.
we may write like this in Form1
private void button1_Click(object s, EventArgs e)
Form2 f=new Form2();
we can also write f.ShowDialog();
Show method does not make the target form (Form2 in this case) as a modal dialog
box. ShowDialog() will make Form2() as a modal dialog box. So, when we use
ShowDialog() method, we cannot click anywhere on Form1 unless we close the
instance of Form2. In case of Show, we can click on Form1 even when Form2 is open.
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