How to change 1 to 00001?

Question

I want to have numbers with a fixed digit count.

example: 00001, 00198, 48484

I can do like this:

    string value;
    if (number < 10)
          


        

Answer 1

According to the MS reference: http://msdn.microsoft.com/en-us/library/dd260048.aspx

You can pad an integer with leading zeros by using the "D" standard numeric format string together with a precision specifier. You can pad both integer and floating-point numbers with leading zeros by using a custom numeric format string.

So:

To display the integer as a decimal value, call its ToString(String) method, and pass the string "Dn" as the value of the format parameter, where n represents the minimum length of the string.

Code:

string value = number.ToString("D5");

.NET fiddle: http://dotnetfiddle.net/0U9A6N

Answer 2

string value = number.ToString("00000");

Answer 3

You can do it this way :

number.ToString("00000")

Answer 4

Same as @Jojo's answer, but using C# 6's interpolated strings:

var value = $"{number:00000}";

Answer 5

Yes, there is:

string value = String.Format("{0:D5}", number);

Answer 6

Apart from String.Format, You can also use String.PadLeft

value = number.ToString().PadLeft(5, '0');