How can I get the value of a custom property from a resource object?

I am trying to get the value(s) of a custom property, called "status" within a method. The method has an object of type IResource available to it.
I have tried the following:
PropertyName propName = new PropertyName("","status");
value = res.getProperty(propName).toString();
However, I am getting a NullPointerException when I try to create the PropertyName instance.
Is there a better way to get the value of a specific property from a resource object?
Thanks,
Tom

Thanks Praveen.
I was missing the default namespace of "http://sapportals.com/xmlns/cm" - I thought I could just pass an empty string for the namespace, but it looks like I must always specifiy, even if it is default.
Tom

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