Insert Unique Date From Textbox?

Nov 28, 2010

i need code to be able to check if (the date in a textbox) is already (used) in the database or not, if yes then give an error message!!

i am using asp.net 3.5 c#

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[Code]....

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[Code]....

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[code]....

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[Code] ....

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[code]....

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