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Editorial Team
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Editorial Team
Asked: May 12, 20262026-05-12T10:08:30+00:00 2026-05-12T10:08:30+00:00

I need to delete an exact line from a text file but I cannot

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I need to delete an exact line from a text file but I cannot for the life of me workout how to go about doing this.

Any suggestions or examples would be greatly appreciated?

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Efficient way to delete a line from a text file (C#)

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1 Answer

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  1. Editorial Team
    Editorial Team
    2026-05-12T10:08:31+00:00Added an answer on May 12, 2026 at 10:08 am

    If the line you want to delete is based on the content of the line:

    string line = null;
    string line_to_delete = "the line i want to delete";
    
    using (StreamReader reader = new StreamReader("C:\\input")) {
        using (StreamWriter writer = new StreamWriter("C:\\output")) {
            while ((line = reader.ReadLine()) != null) {
                if (String.Compare(line, line_to_delete) == 0)
                    continue;
    
                writer.WriteLine(line);
            }
        }
    }
    

    Or if it is based on line number:

    string line = null;
    int line_number = 0;
    int line_to_delete = 12;
    
    using (StreamReader reader = new StreamReader("C:\\input")) {
        using (StreamWriter writer = new StreamWriter("C:\\output")) {
            while ((line = reader.ReadLine()) != null) {
                line_number++;
    
                if (line_number == line_to_delete)
                    continue;
    
                writer.WriteLine(line);
            }
        }
    }
    
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