how do i remove a value?

Hi,
I have the following line of code.
What I would like to do is if any of the _ Order.value are empty then not to have the "," displayed at the end of it because if they were all empty then it would look like ,,,
Does anyone know how I can remove the "," if the value before it is empty?
Thank you very much
string Address = _Order.Address1 + "," + _ Order.Address2 + "," + _ Order.Address3 + "," + _ Order.Postcode;
 
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