C # generate code instances without repeated random numbers

You can consider placing these 100 numbers in a single number group and randomly taking a location (the first time is 1-100, the second time is 1-99 ,...), you can compare the number of the position with the number of the last position.

Using System;
Using System. Collections. Generic;
Using System. Text;

Namespace ConsoleApplication1
{
Class Program
{
Static void Main (string [] args)
{
Int [] arr = new int [101];
Int I;
// Initialize the Array
For (I = 1; I <= 100; I)
{
Arr [I] = I;
}
// Random Number
Random r = new Random ();
For (int j = 100; j> = 1; j --)
{
Int address = r. Next (1, j );
Int tmp = arr [address];
Arr [address] = arr [j];
Arr [j] = tmp;
}
// Output
Foreach (int k in arr)
{
Console. Write (k "");
}
}
}
}