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Hi narasiman,
Please refer the below links
http://www.c-sharpcorner.com/UploadFile/anandn_mvp/aspnetvalidationcontrols06202006021425AM/aspnetvalidationcontrols.aspx
http://www.c-sharpcorner.com/UploadFile/DipalChoksi/ValidControlsWebFDPLCHK11232005022332AM/ValidControlsWebFDPLCHK.aspx
http://www.c-sharpcorner.com/uploadfile/37db1d/working-with-input-validation-controls-in-Asp-Net-3-5/default.aspx
Thanks