The result is that
lowerLimitFragment = string.Format(lowerLimitPattern, startNoParameter.ParameterName);
is never performed causing the "{0}" in the lowerLimitFragment to end up in the SQL since lowerLimitFragment is assigned with the pattern containing the "{0}":
string lowerLimitFragment = lowerLimitPattern;
This all results in an SQL ending with " WHERE r___ >={0}", which is clearly invalid.