hooking into the validation summary control, adding a custom error message

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Hello,
I have a validation summary tag in my .aspx page, and when a user
clicks on a submit button I check the database for a duplicate
username that the user entered into a textbox control.

If I find a duplicate username in the database, I want to insert a
message into the validationsummary control like "username already
exists, please enter a different username".

How can I do this?
.

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