VB.Net - Datagrid Restrict Characters

I have a windows form using VB.Net.  In that windows form, I am allowing updates to a "Y" or "N" column.  How would I restrict so that they can only type in "Y" or "N" into that column?

Right now they can type in anything, and I want to restrict it to the above 2 only.
holemaniaAsked:
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it_saigeDeveloperCommented:
Personally, I would give the user a drop-down, a checkbox or a radio button set.  Especially since this is a boolean type selection.

-saige-
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holemaniaAuthor Commented:
Thanks.  I will look into that.
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