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One of the developers posed me a question about “filters” in the ExactTarget web service. You can use
simplefilterpart() to specify what data point you want to filter on, and of course the value. For example, to filter on CustomerKey -

SimpleFilterPart sfp = new SimpleFilterPart();
sfp.Property = “CustomerKey”;
sfp.SimpleOperator = SimpleOperators.equals;
sfp.Value = new string[] { “TransactionalSendKey” };

Here you are first creating an instance of SimpleFilterPart. Then indicating that you want to filter using “CustomerKey”, indicating the operator and finally the value of the CustomerKey.

Now, if you have two filter criteria, you create two instances of the SimpleFilterPart and join the two using ComplexFilterPart (see code example in the Webserivces API guide, pg. 36)

Going back to the question that came up at client site - they wanted to know how they would add a third filter criteria. Well, it’s simple enough. Create a third instance of SimpleFilterPart and set the property and values as appropriate. Then create another instance of a ComplexFilterPart and assign you first ComplexFilterPart to the LeftOperand and the third SimpleFilterPart to the RightOperand.

ComplexFilterPart ComplexFilter2 = new ComplexFilterPart();
ComplexFilter2.LeftOperand = ComplexFilter1;
ComplexFilter2.LogicalOperator = LogicalOperators.AND;
ComplexFilter2.RightOperand = ThirdSimpleFilterPart;