Show a form if already is running - C#

Question

Hi, let's just say I have Form1 and Form2. Form1 has been minimized and I have a button in Form2. Now clicking the button, it should check if Form1 is already running and it should show up/ restore Form1 from it's minimized state. How do I do that?

Answer 1

If you do not have more than one Form1, then try one of solutions:

Form1 f1 = Application.OpenForms.OfType<Form1>( ).SingleOrDefault( );
if( f1 == null )
{
    f1 = new Form1( );
    f1.Show( );
}
else
{
    if( f1.WindowState == FormWindowState.Minimized ) f1.WindowState = FormWindowState.Normal;
    f1.Activate( );
}