Handling nhibernate exceptions

gistfile1.cs

using System;
using System.Data.SqlClient;
using NHibernate.Exceptions;

public class ExceptionConverter : ISQLExceptionConverter
{
    public Exception Convert(AdoExceptionContextInfo context)
    {
        var exception = ADOExceptionHelper.ExtractDbException(context.SqlException) as SqlException;
        if (exception != null)
        {
            switch (exception.Number)
            {
                case 2601:
                    return new DuplicateKeyException(context.Message, exception.InnerException);
            }
        }
        return SQLStateConverter.HandledNonSpecificException(context.SqlException, context.Message, context.Sql);
    }
}