Convert string array to lowercase

var MyArrayLower = MyArray.Select(s => s.ToLowerInvariant()).ToArray();

(or

MyArray = MyArray.Select(s => s.ToLowerInvariant()).ToArray();

if you want to replace the existing array with a new instance of string[].)

Easiest approach:

MyArray = Array.ConvertAll(MyArray, d => d.ToLower());

Without creating a new Array.

for (int i = 0; i < MyArray.Length; i++)
    MyArray[i] = MyArray[i].ToLower();

strin[] MyArrayLower = (from str in MyArray
                        select str.ToLower()).ToArray();

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