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Duplicate Records

I had table Attendance fields like Emp_id,Date and time.
if i had submit the button for the first time the data will be inserted into database.If I Submit button once again for Same Emp_Id for the same date then it should throw an error.
I am using .NET and C#
Dec 8 '11 #1
1 1523
Rabbit
12,516 Expert Mod 8TB
Put an index or key on emp_id and the date field and make it unique.
Dec 8 '11 #2

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