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= Switch(Fields!YourField.Value = "Value1", "The result of the first condition",
         Fields!YourField.Value = "Value2", "The result of the second condition",
         Fields!YourField.Value = "Value3", "The result of the third condition",
         1 = 1                            , "That is for the default value" )

1=1 refers to default in switch case.

IF you want to use IIF then You will have to nest IIF statements like this:

 = IIF (expression = 1, "Is 1", IIF (expression = 2, "Is 2"))