Combine 2 Data Table

Question

hello.. need your help!

 

1. this is my code for mydatagridview(datagvTableGroupQuestion) 
2. I want to combine 2 data table (dt1 & dt2) but this 2 data table has their own SortOrder. When I merge dt1 with dt2, the datagridview didn't display properly. they shared same SortOrder column.
3. I hide the row, but still same output come.
4. I want to make the dt1 and dt2 display together propely.

hope you guys can help me.

Thank you!