Asp.net C# math problem

Question

I'm trying to build a "simple" web app that calculates either a male or females body fat % based on the U.S. Navy's circumference formula. I have the majority of the app completed at this point. However, I cannot figure out why the way I've setup the formula below won't work. Two of the values are underlined in red in my .cs file.

My Formula:

TBBodyFat.Text = Convert.ToString(495 / (1.0324-.19077(Math.Log(Convert.ToDouble(TBWaist.Text)-Convert.ToDouble(TBNeck.Text)))+.15456(Math.Log(Convert.ToDouble(TBHeight.Text)))));  

Original Example:

%Fat=495/(1.0324-.19077(log(abdomen-neck))+.15456(log(height)))-450       

Pop-Up for the two underlined values (.19077 and .15456):

struct System.Double  
Represents a double-precision floating-point number.

Error:  
Method name expected  

Answer 1

    TBBodyFat.Text = Convert.ToString(495 / (1.0324-.19077*
(Math.Log(Convert.ToDouble(TBWaist.Text)-Convert.ToDouble(TBNeck.Text)))+.15456*
(Math.Log(Convert.ToDouble(TBHeight.Text)))));

C# (not any programming language I've yet encountered) does not take adjacency of numbers to mean multiplication!

Answer 2

Well you need to use "*" for multiplication. Plus I'm not sure whether C# allows ".123" style numeric literals without leading 0.

Try:

 TBBodyFat.Text =
      Convert.ToString(495/
         (1.0324-0.19077*(Math.Log(Convert.ToDouble(TBWaist.Text)-Convert.ToDouble(TBNeck.Text)))+0.15456*(Math.Log(Convert.ToDouble(TBHeight.Text)))));