var matches = Regex.Matches(text,pattern,RegexOptions.Singleline);

matched = false;

foreach (Match m in matches)
{
DataRow newRow = matchedGroups.NewRow();
        newRow["Group"] = m.Groups[1].Value;
        matchedGroups.Rows.Add(newRow);
        matched = true;
}

oMatchedGroups = matchedGroups;