private void UpdateDataGrid() { string type = this.RelationType.SelectedItem.ToString(); if (type == types[0]) { var relations = service.GetPersons(); this.dataGridView1.DataSource = relations; } else if (type == types[1]) { var relations = service.GetLocations(); this.dataGridView1.DataSource = relations; } else { var relations = service.GetProperties(); this.dataGridView1.DataSource = relations; } }