DT = new DvTEntities();      
            var QueryDeveloper = from em in DT.Developer select new { em.DeveloperID, em.FIO };
            developerBindingSource1.DataSource = QueryDeveloper;

            var QueryTypeTask = from em in DT.TypeTask select new { em.TypeTaskID, em.Type };
            typeTaskBindingSource.DataSource = QueryTypeTask;
            
            CBox_Developer.DataSource = developerBindingSource1.DataSource;
            CBox_Developer.DisplayMember = "FIO";
            CBox_Developer.ValueMember = "DeveloperID";

            CBox_TypeTask.DataSource = typeTaskBindingSource.DataSource;
            CBox_TypeTask.DisplayMember = "Type";
            CBox_TypeTask.ValueMember = "TypeTaskID";