check whether form is already opened

Question

I want to check whether form is already opened, if yes, bring it to front, otherwise, create the new form and open it:

frmRegistration frmRegistration1 = new frmRegistration();
                frmRegistration1.Show();

please help. It's a C#.net 2005 winform application

Answer 1

Try this:

    private frmRegistration regForm;

    private void button1_Click(object sender, EventArgs e) {
      if (regForm == null) {
        regForm = new frmRegistration();
        regForm.FormClosed += RegistrationClosed;
        regForm.Show(this);
      }
      regForm.Focus();
    }
    private void RegistrationClosed(object sender, EventArgs e) {
      regForm = null;
    }

Answer 2

thx nobugz, thats exactly what i was looking for. i did a little change, this is my code:

if ( Properties.Settings.Default.frmReg == null )
            {
                Properties.Settings.Default.frmReg = new frmRegistration();
                Properties.Settings.Default.frmReg.Show( this );
            }
else if ( Properties.Settings.Default.frmReg != null && Properties.Settings.Default.frmReg.WindowState == FormWindowState.Minimized)
            {
                Properties.Settings.Default.frmReg.WindowState = FormWindowState.Normal ;
            }
else
            {
                Properties.Settings.Default.frmReg.Focus();
            }

In my case i created the form object in application settings

thx again