将任何数字格式化为三位数？

Question

I want to insert any number was entered by the user, to the database like a three digits.

eg if the user insert ( 1 ) i want to save the number as ( 001 ), or ( 20 ) to ( 020 ).

note: The data type of the database column is string not integer.

Answer 1

int iVal = 1;

iVal.ToString("D3"); // = "001"

Read more on MSDN

Answer 2

You can try

 int value =5;
 Console.WriteLine(value.ToString("000"));
 Console.WriteLine(value.ToString().PadLeft(3,'0'));

produces:

005

005