[HELP] Sorting a gridview based on the values of two different columns

I have a datagrid I will call Cancel

The three fields I need to sort in this datagrid are Column 0(Type) and Column 6 (Number) Column 7(ParentNumber).

The column 0 can have 4 different value
Parent
Child
Orphan
(Blank)
Column 7 have a infinite number of possibilities.

For items that have a Parent and Child in the datadrid I need to keep those grouped together with the Parent being first and the all the child records following

You know they should be grouped together because Column 6 and column 7 would equal each other.

Orphan specs would come next in the overal list being that Column 7 does not match the value of any of them items in column 6

and the next would be Blank items meaning

EX

0...................6 7
Parent 1
Parent 2
Child 20 1
Child 30 1
Child 40 1
Child 50 2
Child 60 2
Child 70 2
Orphan 100 5
Orphan 200 6
Orphan 300 7
(Blank) 1000




I would need the order to display in the datagrid
Parent 1
Child 20 1
Child 30 1
Child 40 1
Parent 2
Child 50 2
Child 60 2
Child 70 2
Orphan 100 5
Orphan 200 6
Orphan 300 7
(Blank) 1000

EX - this didn't work right up at the top.. Also this is a windows form

0...................6..... 7
Parent........... 1.....
Parent........... 2.....
Child ...........20..... 1
Child ...........30..... 1
Child ...........40..... 1
Child ...........50..... 2
Child ...........60..... 2
Child ...........70..... 2
Orphan .......100.... 5
Orphan .......200.... 6
Orphan .......300.... 7
(Blank) .......1000....




I would need the order to display in the datagrid
Parent.............1.....
Child ..............20..... 1
Child ..............30..... 1
Child ..............40..... 1
Parent.............2.....
Child ..............50..... 2
Child ..............60..... 2
Child ..............70..... 2
Orphan ...........100... 5
Orphan ...........200... 6
Orphan ...........300... 7
(Blank) ...........1000..