C# Convert System.Array to a List keeping all indexes in the List from System.Array.

I'm converting a System.Array to a list.  Reason I'm doing this is because I can't check the values I want with _excelvalues[1,5].

System.Array excelvalues = (System.Array)_excelsheet.get_Range("A" + index.ToString(), 
    "K" + index.ToString()).Cells.Value;

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var values = excelvalues.OfType<object>().Select(o => o.ToString()).ToList();

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How do I convert BUT migrate everything from the System.Array to the list.  If it is empty the length of the List does not match the System.Array and I want it to always match.

Example:
System.Array[1,12] -> List[12]

Right now I can get System.Array[1,12] -> List[6]