Filter Dataset based on a boolean value

Hi,

I have implemented a multivalued filter in SSRS,which works fine . Now I am trying to set up a second filter such that based on a boolean condition i would like to filter the dataset based on  a series of values.

The boolean parameter is accomplished as :

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If the user selects "True" the dataset field "Location" has to be filtered based on 3 values "NY,NJ,DC" . If False is selected no filter will be applied on the dataset . The Parameter name is 'Param_Loc' and of datatype 'Integer' .

Can you help me with the Filter expression i have to use here : 

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Looking forward to hearing from you .

Thanks,

Grigory