private void logInButton_Click(object sender, EventArgs e)
        {
            if (userNameTextBox.Text != "" && passwordTextBox.Text != "")
            {
                string username = userNameTextBox.Text;
                string password = passwordTextBox.Text;

                try
                {
                    if (adminManager.CheckAll(username, password))
                    {
                        MainManuUI mainManuUi = new MainManuUI();
                        mainManuUi.Show();
                        this.Opacity = 0;
                    }
                    else
                    {
                        MessageBox.Show("Please give valid username & password.");
                    }
                }
                catch (Exception exception)
                {
                    MessageBox.Show(exception.Message, @"Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                }
                Clear();
            }
        }
        private void logInButton_Click(object sender, EventArgs e)
        {
            if (userNameTextBox.Text!=""&& passwordTextBox.Text!="")
            {
                string username=userNameTextBox.Text;
                string password = passwordTextBox.Text;

                try
                {
                  if (adminManager.CheckAll(username, password))
                  {
                      MainManuUI mainManuUi = new MainManuUI();
                      mainManuUi.Show();
                      this.Opacity = 0;
                  }
                  else
                  {
                      MessageBox.Show("Please give valid username & password.");
                  }
                }
                catch (Exception exception)
                {

                    MessageBox.Show(exception.Message, @"Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                }
                Clear();
            }
        }