remove errors in the logfile

Read the entire file into a string, modify the string, write string back to file

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            string file = File.ReadAllText("filename");
            //make changes
            File.WriteAllText("filename",file);
        }
    }
}

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jdweng