C# - How To Show Error For Entering A Duplicate Record In A Textbox, Exsisting In A Database

Mar 10, 2011

I am working on a project in .NET (C#), connected with a database. And I am entering values in database through 'text-box' control, for a part of the project. What I want is to check if the user entering value already exsists in the database and if so, shows error during that time only.

I have searched for any familiar post here, that could solve my query, but didn't get any.

my EXACT objective(if not cleared earlier):-

when the user enter the value in
textbox, automatically an event to
check any duplicate records in
database should occur. And if found,
displays an error message

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