public void AddColumn(string name, Guid dataValueTypeId, List <IValidator> validators = null) { if (Entity.Schema.Columns.Count == 0) { Entity.Schema.Columns.Add(new EntityColumn { Name = "Id", DataValueType = DataValueType.UniqueidentifierDataValueTypeId, Validators = null }); } if (Entity.Schema.Columns.Select(x => x.Name.ToLower()).Any(x => x == name.ToLower())) { throw new ArgumentException($"EntityColumn with name: {name} already exist!"); } Entity.Schema.Columns.Add(new EntityColumn { Name = name, DataValueType = dataValueTypeId, Validators = validators }); _storage.UpdateDataBaseStructure(); _storage.AddColoumn(Entity); }