Unique 4 digit random number in C#

Question

I want to generate an unique 4 digit random number. This is the below code what I have tried:

Code for generating random number

//Ge         


        

Answer 1

Just one line code

int num = new Random().Next(1000, 9999);

Answer 2

Random generator = new Random();
string number = generator.Next(1, 10000).ToString("D4");

Answer 3

You can consider something like this.

int length = 4;
int number = 50;
string asString = number.ToString("D" + length);

The above code gives the result 0050.

Similarly you can try converting to string and verify.

Answer 4

241 is a four digit number, if you use leading zeros: 0241.

Display the returned number with a format string like this:

String.Format("{0:0000}", n);

Answer 5

0 is the same as 0000.

241 is the same as 0241.

You could format the integer to a string with a leading zero.