Look at the TraceEventCache.Callstack property and the StackTrace class.
From the MSDN:

The Callstack property gets the call stack from the StackTrace property of
the Environment class. The property value lists method calls in reverse
chronological order. That is, the most recent method call is described
first. One line of stack trace information is listed for each method call on
the stack. For more information, see StackTrace.

Hi,
If you're writing a tracing and logging component you may well want to pass
the current method name to your logging component. Rather than hard code it
(then forget to change it when you change the method name) you can use
reflection and the MethodBase class to retrieve the name.

System.Reflection.MethodBase currentMethod =
System.Reflection.MethodBase.GetCurrentMethod();
System.Diagnostics.Debug.WriteLine(currentMethod.Name);
System.Diagnostics.Debug.WriteLine(currentMethod.DeclaringType.Name);
System.Diagnostics.Debug.WriteLine(currentMethod.DeclaringType.Namespace);

ref:http://idunno.org/archive/2004/12/03/163.aspx