public void DeleteDelimitingRule(string rule)
{
DataRow row1 = ParsingTable.FindByRule(rule);
if (row1 != null)
{
row1.Delete();
}
ParsingTable.AcceptChanges();
DataRow[] rows = MappingTable.Select("Rule = '" + rule + "'");
foreach (DataRow row2 in rows)
{
row2.Delete();
}
MappingTable.AcceptChanges();
}