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It should not be called "OOPS" with the "S". It is "OOP".
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Hi Selvi,
Please refer the below links
http://www.codeproject.com/Articles/34125/Chapter-10-Object-Oriented-Programming-Polymorphis
http://www.codeproject.com/Articles/22769/Introduction-to-Object-Oriented-Programming-Concep
http://www.codeproject.com/Articles/219869/Object-Oriented-Programming-in-Csharp-NET
http://www.c-sharpcorner.com/UploadFile/ecabral/OOPSandDotNET106252005024236AM/OOPSandDotNET1.aspx
http://www.c-sharpcorner.com/UploadFile/ecabral/OOPSandDotNET206272005000559AM/OOPSandDotNET2.aspx
Thanks