private static int GetFromIndex(SqlString querySqlString)
{
string subselect = querySqlString.GetSubselectString().ToString();
int fromIndex = querySqlString.IndexOfCaseInsensitive(subselect);
if (fromIndex == -1)
{
fromIndex = querySqlString.ToString().ToLowerInvariant().IndexOf(subselect.ToLowerInvariant());
}
return fromIndex;
}