S>var myFile = File.OpenWrite("C:\temp\0asdask12.txt");
S>Thread.Create(o=>myFile.Write(Encoding.UTF-8.GetBytes(o.ToString())).Start(myBigObject);
S>

var myFile = File.OpenWrite("C:\temp\0asdask12.txt");
Thread.Create(o=>
{
    try     { myFile.Write(Encoding.UTF-8.GetBytes(o.ToString()); }
    finally { myFile.Dispose(); }
}).Start(myBigObject);