C# - increment number and keep zeros in front

Question

I need to make a 40 digit counter variable. It should begin as 0000000000000000000000000000000000000001
and increment to
000000000000000000000000000

Answer 1

Just convert your string to int, perform the addition or any other operations, then convert back to string with adequate number of leading 0's:

// 39 zero's + "1"
string initValue = new String('0', 39) + "1";

// convert to int and add 1
int newValue = Int32.Parse(initValue) + 1;

// convert back to string with leading zero's
string newValueString = newValue.ToString().PadLeft(40, '0');