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.Split will delete the delimiter characters, and the resulting output will not include them.
From MSDN:
Delimiter characters are not included in the elements of the returned
array.
If you need to find the length of a line, just use the .Length property of the string.
In any case, as mentioned in the comments, use the File.ReadAllLines method to avoid having to split the file contents yourself.
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solved Trouble with finding new line character from a string, Reading Text from .txt file