csharp 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");
    }
                    
                

csharp open file

                        
                                System.Diagnostics.Process.Start(filePath);
                            
                        

csharp 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
    //...
}
                            
                        

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