Dataview's distinct function

The rowfilter of dataview does not have the distinct function. Therefore, the result of distinct dataview is saved to the arraylist.

// Get distinct data from dataview
Private arraylist getdistinctdata (ref dataview DV, ref arraylist Al, string column_name)
{
Bool existed = false;

Foreach (datarowview DR in DV)
{
Existed = false;

For (INT I = 0; I <Al. Count; I ++)
{
If (Dr [column_name]. tostring () = al [I]. tostring ())
{
Existed = true;
}
}

If (existed = false)
{
Al. Add (Dr [column_name]);
}
}

Return al;
}