getEntitySetMethod -> passing 2 filter values

Hi experts,

i want to pass to the getEntitySet method of my service 2 filter values

?$filter=PAR1 eq '01'&$filter=PAR2 eq '02'

But how can I access both filters in my service implementation. In the input filter string only the last value is inserted (PAR2 eq '02').

thanks for support.

br,

christoph