Problem in Entity Framework Code first Approach GetValidationError method

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C#

ASP.NET

entity-framework

Here is my save changes method:

public void SaveChanges()
       {
           var transaction = _dbContext.Database.BeginTransaction();       

           try
           {
               _dbContext.SaveChanges();
               transaction.Commit();
           }
           catch (DbEntityValidationException ex)
           {            
               transaction.Rollback();
               throw new DbEntityValidationException(ex.EntityValidationErrors.Last().ValidationErrors.FirstOrDefault().ErrorMessage);
           }

       }

when validation is failed then ex.EntityValidationErrors.count =1
and when validation is failed second time then it will count=2
and so on.

why its count incrementing..

sorry for my poor english..