properly handling "The DELETE statement conflicted with the REFERENCE constraint" exception

Question

I m using EF as ORM and on deleting a record I m getting below exception

"The DELETE statement conflicted with the REFERENCE constraint "FK_dbo.Students_dbo.Classes_Class_ClassID". The conflict occurred in database "Demo.DataAccess.DemoContext", table "dbo.Students", column 'Class_ClassID'.
    The statement has been terminated."

I can understand it is because this record's PK is being refereed as FK in other table's records. Question is how to properly handle it ? My code is handling ConstrainException and sQLException but this error is not being caught by them rather it is being handled by Exception, Please see below code:

public void  DeleteClass(int Id)
    {
        try
        {
            unitOfWork.ClassRepository.Delete(Id);
            unitOfWork.Save();
        }
        catch (ConstraintException e)
        {
            throw e;
        }

        catch (SqlException e)
        {
            throw;
        }
        catch (Exception e)
        {
            throw e;
        }
    }

Question: How to handle it specifically ? Exception handles every error but I need to know when expectly this "Constraint" exception fires. Based on exception type I will need to do different things.

Answer 1

Just try this

catch (DbEntityValidationException e)

cheers