How can open window form

private void child1Button_Click(object sender, EventArgs e)
{
  Form2 testDialog = new Form2();

  // Show testDialog as a modal dialog and determine if DialogResult = OK.
  if (testDialog.ShowDialog(this) == DialogResult.OK)
  {
     //do success operation
  }
  else
  {
     // Child form is cancelled
  }
  testDialog.Dispose();

}

private void child1Button_Click(object sender, EventArgs e)
 {
   Form2 testDialog = new Form2();
   testDialog.Show();
 }

Quote:

hi bikramjeet,
I got your problem. I also faced same problem while creating licensed application.Luckily i saw your problem.

I think following code (vb.net) will solve your problem

Dim frm As New frmLicense
    Private Sub MainForm_Activated(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Activated
        If Not frm.IsDisposed Then
            frm.Focus()
        End If
    End Sub

    Private Sub MainForm_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        frm.TopMost = True
        frm.Show()
    End Sub

I have written simple code. frmlicense is your license activation popup form. I suggest make it singleton if u want. U can use any converter to get c# code. don't think its needed.

This will definitely solve your problem. If u find this suitable,accept as solution.So it will be helpful to other also.