How do I quicky fill an array with a specific value?

I am not aware of such a method. You could write one yourself, though:

public static void Init<T>(this T[] array, T value)
{
    for(int i=0; i < array.Length; ++i)
    {
        array[i] = value;
    }
}

You can call it like this:

int[] myArray = new int[5];
myArray.Init(-1);

The other way is:

int[] arr =  Enumerable.Repeat(-1, 10).ToArray();
Console.WriteLine(string.Join(",",arr));

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