Select and Upload multiple files in HTML5 supported browsers using FileUpload in ASP.Net 2.0, 3.0, 3.5 and 4.0

Here Mudassar Ahmed Khan has explained how to select upload multiple files in browsers that support HTML5 using FileUpload control in in ASP.Net 2.0, 3.0, 3.5 and 4.0. ASP.Net 4.5 added a new feature to FileUpload control i.e. AllowMultiple which allows user to select multiple files in browsers that support HTML5. ASP.Net versions 2.0, 3.0, 3.5 and 4.0 does not support AllowMultiple feature.