i searched for a method to split strings and i found one.
Now my problem is that i can´t use the method like it is described.

Stackoverflow answer

It is going to tell that i

cannot implicitly convert type 'System.Collections.Generic.IEnumerable' to 'string[]'.

The provided method is:

public static class EnumerableEx
{
    public static IEnumerable<string> SplitBy(this string str, int chunkLength)
    {
        if (String.IsNullOrEmpty(str)) throw new ArgumentException();
        if (chunkLength < 1) throw new ArgumentException();

        for (int i = 0; i < str.Length; i += chunkLength)
        {
            if (chunkLength + i > str.Length)
                chunkLength = str.Length - i;

            yield return str.Substring(i, chunkLength);
        }
    }
}

How he said it is used:

string[] result = "bobjoecat".SplitBy(3); // [bob, joe, cat]