Random Number Generation – Same Number returned [duplicate]

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You need to keep the same Random object. Put it outside your static method as a static member

private static Random rand = new Random();

public static int rInt(int exclUB, int incLB = 0)
{
    int t = rand.Next(incLB, exclUB);
    return t;
}

Edit
The reason is the finite resolution of the clock used to initialize Random. Subsequent initializations of Random will get the same starting position in the random sequence. When reusing the same Random the next value in the random sequence is always generated.

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