Removing elements from arraylist

I have a arraylist arrHighlightIDs which for instance can be something like (67,67,68,68,68,100,101,101)

I want too remove all the elements with the same value (e.g. 68, his variable is randomly generated) so I wrote the following code:

iNumberOfTimes = 0;
foreach(object item in arrHighlightIDs)
{
      if (item.ToString() == arrHighlightIDs[iRandValue])
      {
            iNumberOfTimes = iNumberOfTimes + 1;
      }
}      
Response.Write("Number of times to be deleted: " + iNumberOfTimes);
                              
while (iNumberOfTimes > 0)
{
      arrHighlightIDs.Remove(arrHighlightIDs[iRandValue]);
      iNumberOfTimes = iNumberOfTimes - 1;
}


First of all this does not work, second of all, there must be an easier way to delete multiple elements with the same value from an arraylist at once. Any ideas?

Thanks