Does Index of Array Exist

What exactly do you mean by "is a valid element"? You could just do:

if (array.Length >= 26)

which would tell you whether 25 is a valid index into the array or not (assuming a 0 lower bound).

If you need to know whether it's non-null or not, just use:

if (array[25] != null)

(or a combination of the two).

If these don't help, please give a more precise meaning of "valid" for your problem.

You can use LINQ to achieve that too:

var exists = array.ElementAtOrDefault(index) != null;

Test the length

int index = 25;
if(index < array.Length)
{
    //it exists
}

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