How to trap the results of constraints in SQL Server 2005from Visual studio C# Code?

Hi all,

Suppose I have set a CHECK constraint to a column where Salary field is not permitted to be less than 1000 or greater than 10000.

In this situation, when I insert a new record with salary as 10, using a stored procedure from Visual Studio, how will I trap the error from C# Code?

Thanks

Tomy

Your best bet would be to have layered constraints. Your business logic should also make sure that the data being entered is between 1000 and 10000, so that the violation would never reach the database. Database constraints should be left in place for people who like to edit the database directly.

While you can get a violated constraint error from the database, I don't believe it would be phrased properly to display to your users, which would mean lots of parsing in order to make the error presentable and user-friendly. It would be better to use a range validator to prevent the user from entering incorrect information.

As for trapping the error, use Try/Catch blocks

try{}catch (System.Data.SqlClient.SqlException ex){// Handle SQL Exceptions here; // all sql exceptions fall under this exception type, // but the errorcode/errors will be different.}catch (Exception ex){// handle all other errors here.}

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Thanks a lot.