here are my article about the issue
http://www.c-sharpcorner.com/UploadFile/yougerthen/101152008124829PM/1.aspx
http://www.c-sharpcorner.com/UploadFile/yougerthen/201152008123837PM/2.aspx
http://www.c-sharpcorner.com/UploadFile/yougerthen/301152008125757PM/3.aspx
http://www.c-sharpcorner.com/UploadFile/yougerthen/401152008130743PM/4.aspx
http://www.c-sharpcorner.com/UploadFile/yougerthen/501152008131829PM/5.aspx
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