Update Dataview in Datatable C#?

my requirement is i have to sort datatable.

datatable named dt_Path and column named PAFPOS contains data like

for representation

PAFPOS 
10
4
2
6
5
7
1
3
9
8
15
12
11
13
14
19
16
17
20
18
.
.
.
requirement says that number 1 to 10,  11 to 20 should sorted in descending order  
this end point numbers i will be passing in Path1 and Path2 Variable as this numbers i get from dt_Line table.
example : Path1 = 1 and Path2 = 10

required result

PAFPOS
10
9
8
7
6
5
4
3
2
1
20
19
18
17
16
15
14
13
12
11
.
.
.

what i have done is

for (int i = 0; i < dt_Line.Rows.Count; i++)
{

     Path1 = Convert.ToInt64(dt_Line.Rows[i]["PA_KEY_1"]);
     Path2 = Convert.ToInt64(dt_Line.Rows[i]["PA_KEY_2"]);

     DataView view = new DataView(dt_Path);                           
     view.RowFilter = "PAFPOS >= " + Convert.ToInt64(Path1) + " and PAFPOS <= " + Convert.ToInt64(Path2) + "";
     view.Sort = "PAFPOS DESC"; 
	       
}


now i get Sorted values in view but i dont know how to update that sorted values back to datatable dt_Path.

Condition is After sorting; number of records in Sorted dt_Path should be equal to number of records in dt_Path before Sorting.

Also I wanna ask. guys is it possible to update dataview back to datatable.

Regards.