private void Data_Bases_Oriented() { var idProject = Models.Search_Model(comboBox_SelecProject.Text); Model_information.Id = idProject.id; businessRules.Clear(); businessRules = new List <string> { "Select an business rule" }; var idDataBasesOriented = Business_Rules.Filtre_Data_Bases_Oriented(1); foreach (var item in idDataBasesOriented) { var foreKey = Business_Rules.Search_Rule_Id(item.business_rules_idbusiness_rules); var NameRule = Business_Rules.Search_RuleName_IdModel(foreKey.rules_name, Model_information.Id); if (NameRule != null) { businessRules.Add(NameRule.rules_name); } } comboBox_SelectBusinessRule.DataSource = businessRules; }