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Insert new record in MDF existing data should not be given twice

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My requirement is that the child object is associated with the parent so that we can give data of the fields multiple times. but if the data value given repeats more than one time then the system should not take it.

lets say that we have a MDF for education details then for high school the employee will give one date and saves it. Next for college they should not repeat the same date. If so then an error message should populate.

Please let me know if you have any idea.

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