Check out example codes for "when do i need to end a sentence with ; in c#". It will help you in understanding the concepts better.

Code Example 1

//after every sentence like int a,b ;
//and not in a places like this :
if(a <= b) 
{
  //you don't place ; in the } place
  Console.WriteLine("a <= b"); //after this you need to place ;
}

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