Restart after file uploading?

Hi,

   I have a click once installation. During the installation it will pop-up to load a license file. What happens is that after I upload I check it always show me the license status is false. Only after I restart then its fine. Below is my codes.

                   

File.Copy(path, destinationPath, true);                    System.Windows.MessageBox.Show("Validitiy is :" + IsValidLicenseAvailable());                    //Application.Current.Shutdown();                    if (IsValidLicenseAvailable() == true)                    {                        this.DialogResult = true;                        this.Close();                    }

So immediately after uploading the status is always false. Thus I was thinking after uploading can I like restart my application rather then close the pop-up and then load my main window?