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FileStream filest = new FileStream(@"d:\test.txt", FileMode.Open, FileAccess.Read);
StreamReader sr = new StreamReader(filest);
string s = sr.ReadToEnd();
sr.Close();
FileStream filest1 = new FileStream(@"d:\test.txt", FileMode.Open, FileAccess.Write);
StreamWriter sw = new StreamWriter(filest1);
sw.WriteLine("test");
sw.Write(s);
sw.Close();