DatePicker does not exist in the namespace in windows phone 8.0 -


when run application works fine design page giving error "invalid markup" , name "datepicker" not exist in namespace "clr-namespace:microsoft.phone.controls;assembly=microsoft.phone.controls.toolkit".

i think spelling mistake assembly 

xmlns:toolkit="clr-namespace:microsoft.phone.controls;assembly=microsoft.phone.controls.toolkit"

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