"It's up to you to find the "using" you need..."

Except when the starting solution uses a List<string>

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Lol, at first I thought it was the number of tiems you were supposed to iterate over the array. Needless to say, with "while count < n", it timed out.

Suggestion/Question not Issue

Not really an issue is it? Just ignore it.

I thought it was nice piece of misdirection. :]

Marked issue as resolved.

using System.Collections.Generic;

It's up to you to find the "using" you need...

According to the standard C# naming convention, method names should start with a capital (i.e. EncodeStr and Decode).

I know but at that time in my team we used to write function this way. I think it's rather a suggestion than an issue:-)

This is a frequent issue with different Kata. Refresh the page ([F5]) and re-submit.