Full repo available at https://bitbucket.org/createdbyx/codefarts.utilities-extension-methods-only

/// <summary>
/// Removes a range of entries inside an array.
/// </summary>
/// <typeparam name="T">Specifies the generic type of the array.</typeparam>
/// <param name="array">The destination array.</param>
/// <param name="index">The start index where entries will be removed from.</param>
/// <param name="length">The number of entries to be removed.</param>
/// <returns>
/// Returns the resized and updated destination array.
/// </returns>
/// <exception cref="ArgumentOutOfRangeException">index</exception>
public static T[] RemoveRange<T>(this T[] array, int index, int length)
{
    if (length < 1)
    {
        return array;
    }

    if (index < 0 || index > array.Length - 1)
    {
        throw new ArgumentOutOfRangeException("index");
    }

    if (index + length > array.Length - 1)
    {
        Array.Resize(ref array, index);
        return array;
    }

    var endLength = Math.Max(0, Math.Min(array.Length - index, array.Length - (index + length)));
    var tempArray = new T[endLength];
    Array.Copy(array, index + length, tempArray, 0, endLength);
    Array.Resize(ref array, array.Length - length);
    tempArray.CopyTo(array, array.Length - endLength);
    return array;
}