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C# open file for reading and writing

C# open file

System.Diagnostics.Process.Start(filePath);

C# open file for reading and writing

static void Main(string[] args)
    {
        var text = File.ReadAllText(@"C:\words.txt");
        File.WriteAllText(@"C:\words.txt", text + "DERP");
    }

Source: stackoverflow.com

C# read file while writing

using (var fs = new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
using (var sr = new StreamReader(fs, Encoding.Default)) {
    // read the stream
    //...
}

Source: stackoverflow.com

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System.IO.FileNotFoundException: 'Could not load file or assembly 'Microsoft.Bcl.AsyncInterfaces, Version=1.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'.
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