c# - The function 'CreateTime' is not supported by SQL Server Compact -

i wanted change code-first project sql server compact 4.0.

but have problem following linq expression

db.test.orderby(t => t.name)        .thenby(t => t.dayofweek)        .thenby(t => dbfunctions.createtime(t.timefrom.hour, t.timefrom.minute, t.timefrom.second)) 

it throws following error

the function 'createtime' not supported sql server compact

is there way write expression without using createtime method?

i'm using code-first sql server compact. in model have property called timestamp of type datetime. @ do:

db.test.orderby(t => t.name)    .thenby(t => t.timestamp.dayofweek)    .thenby(t => t.timestamp.hour)    .thenby(t => t.timestamp.minute)    .thenby(t => t.timestamp.second)    .thenby(t => t.timestamp.millisecond); 

or

db.test.orderby(t => t.name)    .thenby(t => t.timestamp.ticks);