The successor to Active Server Pages, ASP.NET websites utilize the .NET framework to produce dynamic, data and content-driven web applications and services. ASP.NET code can be written using any .NET supported language. As of 2009, ASP.NET can also apply the Model-View-Controller (MVC) pattern to web applications
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window.close() or self.close() will work, only if window is open by javascript
e.g.
function openWin() {
myWindow = window.open("", "myWindow", "width=200, height=100"); // Opens a new window
}
function closeWin() {
myWindow.close(); // Closes the new window
}