title: How to make a simple popup box in Visual C# 2015 web application?
body: <p>As I know I can make a popup window in vs 2010 using MessageBox.Show() method. But it is not available in VS2015, so I want to know if there is any simple alternative to it. 
  I am creating a web application using visual studio C# and no class System.Windows.Forms is available as given in the link. </p>