How to initialize a StringBuilder to null 
<p>Hi all I am facing a problem with <code>StringBuilder</code>. While automating, I will assign the value of <code>testfailed</code> to a <code>StringBuilder</code> as</p>

<pre><code>private  StringBuilder testFailed=new StringBuilder();
public void Test1()
{
  testFailed= SomeTest();
}

public void Test2()
{
   testFailed=null;
  //testFailed=testFailed.Clear();
  //testFailed= new StringBuilder();
  testFailed=someTest1();
}
</code></pre>

<p>when ever first test fails, the testFailed <code>StringBuilder</code> will append the next test result or if test passes then <code>testFailed</code> string will display the testFailed b result value. As I used commented methods and tried it didn't work for that. Let me know any other ways. Thanks in advance.</p>
