title: the default search base directory is not appDomain.BaseDirectory?
body: <p>i created a appDomain in my application which base directory is different to my application directory, but it is under the application. i loaded an assembly in the created domain and create object instance from that domain. then i try to execute the method of the object. but i observe an odd behavior.</p>
  
  <pre><code>    public class Class1 : MarshalByRefObject
  {
      public void action()
      {
          Console.WriteLine(AppDomain.CurrentDomain.BaseDirectory);
          TextReader sr = new StreamReader(File.OpenRead(AppDomain.CurrentDomain.BaseDirectory + "\\test.txt"));
  
          Console.WriteLine(sr.ReadToEnd());
      }
  }
  </code></pre>
  
  <p>there's a 'test.txt' file under the appDomain.BaseDirectory. but if i only give the file name, the application still try to search the file from the application execution directory and failed to find the file.</p>
  
  <p>how can i make sure the code executed in another domain is using the base directory as the default search path.</p>