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Im creating a Login using a window control to allow a user to login into a WPF application that I am creating. So far, I have created a method that checks whether the user has entered in the correct credentials for the username and password in a textbox on the login screen, binding two properties . I have achieved this by creating a bool method, like so; public bool CheckLogin() { var user = context.Users.Where(i => i.Username == this.Username).SingleOrDefault(); if (user == null) { MessageBox.Show("Unable to Login, incorrect credentials."); return false; } else if (this.Username == user.Username || this.Password.ToString() == user.Password) { MessageBox.Show("Welcome " + user.Username + ", you have successfully logged in."); return true; } else { MessageBox.Show("Unable to Login, incorrect credentials."); return false; } } public ICommand ShowLoginCommand { get { if (this.showLoginCommand == null) { this.showLoginCommand = new RelayCommand(this.LoginExecute, null); } return this.showLoginCommand; } } private void LoginExecute() { this.CheckLogin(); } I also have a command that I bind to my button within the xaml like so; <Button Name="btnLogin" IsDefault="True" Content="Login" Command="{Binding ShowLoginCommand}" /> When I enter in the username and password it executes the appropriated code, whether it being right, or wrong. But how can I close this window from the ViewModel when both username and password are correct? I have previously tried using a

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