c# - LINQ to Entities does not recognize the method? -

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var tmp = productdbset.where(x => x.lastupdate >= datetime.minvalue && x.lastupdate.value.tostring("mm/yyyy") == curmonth).select(x => x.id);

while run above code, got error message:

linq entities not recognize method 'system.string tostring(system.string)' method, , method cannot translated store expression.

also tried, 

var tmp = productdbset.where(x => x.lastupdate >= datetime.minvalue && x.lastupdate.value.tostring("mm/yyyy") == curmonth).tolist().select(x => x.id);

but same,

how can solve that?

as error message telling you, tostring method of datetime isn't supported.

since you're trying determine if month , year of date match given value, can compare actual month , year, rather trying string containing month , year compare with.

x.lastupdate.value.year == yeartocomparewith &&      x.lastupdate.value.month = monthtocomparewith

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