I have a dataset that has megs of data. I want to know if there is a
way to find out if data in a particular column is unique or not. Does
the dataset or a datatable have a built in function that i can use?

Thanks

DataColumn.Unique

But it is only going to be set to Unique if you have set it that way,
or if it was auto-generated that way in your dataset schema.
How are you filling your dataset, and is it strongly typed?

Thanks. No, the dataset is not strongly typed and I am filling the
dataset from a datasource and I am not sure if this datasource has any
unique constraints on the data.

Ok, I am doing this:

bool isUnique = data.Tables["Item"].Columns["Number"].Unique;

Now, if isUnique is false, is there a way to find out the value of the
item that's duplicate?

ok. Yeah you would need to loop through and check for duplicates.
A loop inside a loop would be the quickest and easiest way, but
depending how many rows you have, not that effecient.

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