Try this:
List<string> selectedAddress = new List<string>();
protected DataView GetSelectedItems()
{
DataView dvResult = new DataView(dtresult);
string query = "";
int count = selectedAddress.Count();
for (int j = 0; j < selectedAddress.Count; j++)
{
string val = selectedAddress[j].ToString() + ",";
query += val;
}
query = query.Remove(query.Length - 1);
dvResult.RowFilter = "ID IN(" + query + ")";
return dvResult;
}