I want auto generation of numbers in c#. like E001,E002

[Prasannakumar73]

I am New to .net,I hope it would be great help for me I want auto generation of numbers in c#. Actually i have EmpCode with E and C followed by 3digit no. I have two text boxes. one box is for selecting E or C and another one for number which i want automatically generate like E001,E002

[inspectelement]

List<String> numbers = new List<String>();
string code = "E"; //Or "C"
for(int i = 0; i <= 999; i++)
{
    numbers.Add(String.Format("{0}{1:000}", code, i));
}

Most teachers use this for auto generated passwords for students, but the account input is deleted.This will create E000 to E999. Same for C.