DeleteDuplicateRecord From ArrayList

ar is ArrayList
int index;
for(int i=0; i<(ar.Count-1); i++)
{
index=ar.IndexOf(ar[i], i+1);
while( index>i )
{
ar.RemoveAt(index);
if( i<(ar.Count-1) )
{
index=ar.IndexOf(ar[i], i+1);
}
else
{
index=-1;
} } }