if statement - How do you make an 'if' stament "do nothing" in C#? -

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Here is an example of my code, I do not have to do the last if do anything, then Do something. 

  if (daPilot.Gas> 0); Else daPilot.failMessage3 ();    
 
 
 You have already done this. congratulation.  
 Of course, very few confusing designs are not the only condition and after that there is no  if  is not with any  else .

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