Edit Datatable After Select

Here is my scenerio.  I have a datatable that I'm building in memory.  Prior to adding rows to the table I have to see if my ID field exists in the table.  If it does I just need to update the row that already exists, if not then I add it.

Presently I'm using a Select statement on the datatable to see if the ID exists.  This returns an array of any rows that match my Select statement.  The problem though is that once I determine that I have found a matching row I'm not able to then edit that row in my original datatable.

How can I accomplish this?
tsprksAsked:
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Athar SyedCommented:
Get the DataRow from the DataTable and assign the new values to the DataRow. Once done, Update the DataRow back to the DataTable and AcceptChanges.

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