private void SearchAndReplace()
{
int count = 1;
// To prevent flickering
richEditControl1.Document.BeginUpdate();
// Get first search result and start iterating
ISearchResult searchResult = richEditControl1.Document.StartSearch(searchString, SearchOptions.CaseSensitive, SearchDirection.Forward, richEditControl1.Document.Range);
while (searchResult.FindNext())
{
searchResult.Replace(String.Empty);
DocumentRange insertRange = richEditControl1.Document.InsertText(searchResult.CurrentResult.Start, replaceString);
richEditControl1.Document.InsertRtfText(insertRange.End, replaceRtfPart.Replace("$number$", count.ToString()));
count++;
}
richEditControl1.Document.EndUpdate();
}