public void SaveAddParent() { SelectedIDParent = selectedParentAfterChange[0]; SelectedFirstName = selectedParentAfterChange[1]; SelectedLastName = selectedParentAfterChange[2]; getter.DataGrid_Loaded(SelectedIDParent, SelectedFirstName, SelectedLastName); DBClass.openConnection(); DBClass.sql = "Insert into parents( firstName, lastName ) values ('" + SelectedFirstName + "', '" + SelectedLastName + "')"; //DBClass.sql = "Insert parents Set firstName = '" + SelectedFirstName + "', lastName = '" + SelectedLastName + "'where id = '" + _selectedIDParent + "'"; DBClass.cmd.CommandType = CommandType.Text; DBClass.cmd.CommandText = DBClass.sql; DBClass.da = new SqlDataAdapter(DBClass.cmd); DBClass.dt = new DataTable(); DBClass.da.Fill(DBClass.dt); }