How to prevent entering duplicate

Hi All, I have a grid and it that grid edit functionality is provided. I need to make sure that when user click on edit, the duplicate values should not be entered. Can anyone please help me out.

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    Certified Lead Developer
    in reply to shubhamy0001

    I think both Stefan and I are pretty unclear what your actual use case is.  I suggest starting at the beginning and giving us a step-by-step description of what you would expect the user experience to be, including which of those expectations you're currently unable to meet.  By that I mean you should write it out step-by-step giving details, instead of a vague overview that requires us to just guess at what you're really after.

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