I have Two winform1-frmcheckupdate 2-FrmUserLogin
simple I run our application ,if updated  installer ".msi" is available then show a message box with MessageBoxButtons.YesNo to update existing  ".msi".
if i click "YES" then updation start successfully,
But if i click "NO" then I want to show  dialog as  "FrmUserLogin " form and closed form as frmcheckupdate.
I have try as below code -
 
   frmchkupdate fu = new frmchkupdate();
                    fu.Close();
                    fu.Hide();
                    //checkForUpdate.StopThread();
// fu.Dispose();
                    FrmUserLogin fl = new FrmUserLogin();
                    fl.ShowDialog(); 
 
plz tell me why frmchkupdate is not closed/hide.