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FileStream fs = new FileStream("D:\\test.txt", FileMode.Open, FileAccess.Read);
StreamReader sr = new StreamReader(fs);
string s = sr.ReadToEnd();
string t = s.Substring(8, s.Length - 8);
s=s.Remove(8);
sr.Close();
fs.Close();
StreamWriter w = new StreamWriter("D:\\test.txt");
w.Write(s);
w.Close();
FileStream fw = new FileStream("D:\\test1.txt", FileMode.Create, FileAccess.Write);
StreamWriter sw = new StreamWriter(fw);
sw.Write(t);
sw.Close();
fw.Close();