Generating random numbers without repeating.C#

Question

Hi everyone I am trying to generate 6 different numbers on the same line in c# but the problem that i face is some of the numbers are repeating on the same line.Here is my c

Answer 1

The best approach (CPU time-wise) for such tasks is creating an array of all possible numbers and taking 6 items from it while removing the item you just took from the array. Example:

const int min = 1, max = 49;
List listNumbers = new List();
int[] numbers = new int[max - min + 1];
int i, len = max - min + 1, number;

for (i = min; i < max; i++) numbers[i - min] = i;
for (i = 0; i < 6; i++) {
    number = rand.Next(0, len - 1);
    listNumbers.Add(numbers[number]);
    if (number != (len - 1)) numbers[number] = numbers[len - 1];
    len--;
}