Blocked async call in WPF C# 5.0 and .NET 4.5

Blocked async call in WPF C# 5.0 and .NET 4.5

References

Reference NO 1

http://stackoverflow.com/questions/15193171/blocked-async-call-in-wpf-c-sharp-5-0-and-net-4-5

Reference NO 2

http://msdn.microsoft.com/en-us/library/vstudio/hh191443.aspx

Reference NO 3

http://www.abhisheksur.com/2010/10/c-50-asynchronous-made-easy.html

Reference NO 4

http://www.dotnetcurry.com/ShowArticle.aspx?ID=869

Reference NO 5

http://www.danderson.me/posts/async-and-await-ui-synchronization-with-c-5-net-4-5-and-winforms/

Reference NO 6

http://www.codeproject.com/Articles/127291/C-5-0-vNext-New-Asynchronous-Pattern

Reference NO 7

http://reedcopsey.com/2010/10/28/c-5-async-part-1-simplifying-asynchrony-that-for-which-we-await/

Reference NO 8

http://www.mindscapehq.com/blog/index.php/2012/03/13/asynchronous-programming-in-c-5/