public UpdateStatementBuilder(object entity, ConstraintsCollection bunchOfConstraints)
 {
     if (entity == null) throw new ArgumentNullException("entityType is null.");
     this.entity = entity;
     this.bunchOfConstraints = bunchOfConstraints;
     this.Build();
 }
 public DeleteStatementBuilder(Type entityType, ConstraintsCollection bunchOfContraints)
 {
     this.entity = entityType;
     this.bunchOfConstraints = bunchOfContraints;
     this.Build();
 }