c# add element to array

private T[] AddElementToArray<T>(T[] array, T element) {
    T[] newArray = new T[array.Length + 1];
    int i;
    for (i = 0; i < array.Length; i++) {
        newArray[i] = array[i];
    }
    newArray[i] = element;
    return newArray;
}

var Freds = new [] { "Fred", "Freddy" };
Freds = Freds.Concat(new [] { "Frederick" }).ToArray();

int[] arrayOfNumbers = new int[400];
for (int index = 0; runs < 400; runs++)
{
  	// Using array[index], you can modify the value at that index
    arrayOfNumbers[index] = value;
}

// To add a value to a C# array, use 'Add()'
List<string> ls = new List<string>();
ls.Add("Hello");

List<string> l = new List<string>(){"one","two","tree","four",};

Array.Resize(ref objArray, objArray.Length + 1);
objArray[objArray.Length - 1] = new Someobject();