Update Function

السلام عليكم

private int UpdateFile(string oldString, string newString)
   {
	   int found = 0;
	   //string oldString = "Yaman";
	   //string newString = "Amman";
	   string line = string.Empty;
	   string path = @"c:\myfilename.txt";
	   string temppath = @"c:\myfilename1.txt";

	   StreamWriter sw = new StreamWriter(temppath);
	   StreamReader sr = new StreamReader(path);

	   while (sr.Peek() >= 0)
	   {
		   line = sr.ReadLine();
		   if (line.IndexOf(oldString) > -1)
		   {
			   line = line.Replace(oldString, newString);
			   found++;
		   }
		   sw.WriteLine(line);
	   }
	   sr.Close();
	   // delete the original file
	   File.Delete(path);
	   sw.Close();
	   //set the name of the original file to the temporary
	   FileInfo Finfo = new FileInfo(temppath);
	   if (Finfo.Exists)
	   { Finfo.MoveTo(path); }

	   return found; 
   }

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