how to get an exception message from thread...???

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C#2.0

C#

the method which runs in my thread gives an exception. i want to get that exception message to the main thread.
please tell me how to do this.
here is my code part

public void Import(string id)
{
try
{
Thread t1 = new Thread(ImportThread1);
Thread t2 = new Thread(ImportThread2);
t1.Start(obj1);
t2.Start(obj2);
t1.Join();
t2.Join();
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
}

private void ImportThread1(object info)
{
try
{
Method1(info.ToString);
}
catch (Exception ex)
{
throw ex; // i want to pass this exception to the main thread
}
}

private void ImportThread1(object info)
{
try
{
Method2(info.ToString);
}
catch (Exception ex)
{
throw ex; // i want to pass this exception to the main thread
}
}