Take look on line string[] Columns = line.Split(‘,’);
You try to split line by comma, but no commas in the file. Try split by space.
Like
string[] Columns = line.Split(' ');
Or
string[] Columns = line.Split(new []{' '}, StringSplitOptions.RemoveEmptyEntries)
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solved How split space to fill dataGridView from file .txt in C#