simultaneous read-write a file in C#

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Ok, two edits later…

This should work. The first time I tried it I think I had forgotten to set FileMode.Append on the oStream.

string test = "foo.txt";

var oStream = new FileStream(test, FileMode.Append, FileAccess.Write, FileShare.Read); 
var iStream = new FileStream(test, FileMode.Open, FileAccess.Read, FileShare.ReadWrite); 

var sw = new System.IO.StreamWriter(oStream);
var sr = new System.IO.StreamReader(iStream); 
var res = sr.ReadLine(); 
res = sr.ReadLine();
sw.WriteLine("g"); 
sw.Flush(); 
res = sr.ReadLine();
res = sr.ReadLine();
sw.WriteLine("h"); sw.Flush();
sw.WriteLine("i"); sw.Flush(); 
sw.WriteLine("j"); sw.Flush(); 
sw.WriteLine("k"); sw.Flush(); 
res = sr.ReadLine(); 
res = sr.ReadLine(); 
res = sr.ReadLine();
res = sr.ReadLine();
res = sr.ReadLine();
res = sr.ReadLine();

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