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comparing values in Grid view

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hi
my situation is like this.
I have a grid view and i hav left one column in EDIT mode during the run time,
and what i want is "The User has to enter only the specified options(letters) only".I want to compare the value and throw an error(something like error),if he enters other than the specified ones.How can i do this.
please send me in detail.
Apr 10 '07 #1
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