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Prepare code for loop

Statements to add 1,2,3 to list box individually are converted to a while loop.

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Code to add 1, 2, 3 to lstNumbers without loop:

 //Add numbers 1, 2, 3 to list box, NO loop
int num = 0;
num++;
lstNumbers.Items.Add(num);
num++;
lstNumbers.Items.Add(num); 
num++;
lstNumbers.Items.Add(num);

Code to add 1, 2, 3 to lstNumbers with while loop:

//Add numbers 1, 2, 3 to list box, with WHILE loop
int num = 0;
while (num < 3)
{
  num++;
  lstNumbers.Items.Add(num);
}

NEXT: A few notes about the while loop