Return to Answer

Just a quick nitpick, but it could help if you need to debug

if (numberAboveMiddle <= 0)
 throw new ArgumentOutOfRangeException("numberAboveMiddle", numberAboveMiddle, "The parameter numberAboveMiddle must be greater than 0."); 

if (numberBelowMiddle <= 0)
 throw new ArgumentOutOfRangeException("numberAboveMiddle", numberBelowMiddle, "The parameter numberBelowMiddle must be greater than 0.");

the parameter name in the second ArgumentOutOfRangeException should be "numberBelowMiddle".

Just a quick nitpick, but it could help if you need to debug

if (numberAboveMiddle <= 0)
 throw new ArgumentOutOfRangeException("numberAboveMiddle", numberAboveMiddle, "The parameter numberAboveMiddle must be greater than 0."); 
if (numberBelowMiddle <= 0)
 throw new ArgumentOutOfRangeException("numberAboveMiddle", numberBelowMiddle, "The parameter numberBelowMiddle must be greater than 0.");

the parameter name in the second ArgumentOutOfRangeException should be "numberBelowMiddle".

Just a quick nitpick, but it could help if you need to debug

if (numberAboveMiddle <= 0)
 throw new ArgumentOutOfRangeException("numberAboveMiddle", numberAboveMiddle, "The parameter numberAboveMiddle must be greater than 0."); 

if (numberBelowMiddle <= 0)
 throw new ArgumentOutOfRangeException("numberAboveMiddle", numberBelowMiddle, "The parameter numberBelowMiddle must be greater than 0.");

the parameter name in the second ArgumentOutOfRangeException should be "numberBelowMiddle".

Just a quick nitpick, but it could help if you need to debug

if (numberAboveMiddle <= 0)
 throw new ArgumentOutOfRangeException("numberAboveMiddle", numberAboveMiddle, "The parameter numberAboveMiddle must be greater than 0."); 

if (numberBelowMiddle <= 0)
 throw new ArgumentOutOfRangeException("numberAboveMiddle", numberBelowMiddle, "The parameter numberBelowMiddle must be greater than 0.");

the parameter name in the second ArgumentOutOfRangeException should be "numberBelowMiddle".