How to insert null in datetime field

How to insert null in datetime field, I want to pass it as a parameter from front end.
and then how to read null date value from table.
searchsanjaysharmaAsked:
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appariCommented:
from front end to pass null value to db assign dbnull.value to the parameter value.
for more help can you post existing code?
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searchsanjaysharmaAuthor Commented:
It worked, Now how to retrieve it.
Covertaken and coverdate are two fields.

select Covertaken+'-'+convert(varchar,coverdate,106) from emp
not works if coverdate is null
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appariCommented:
try this

select Covertaken+isnull('-'+convert(varchar,coverdate,106),'') from emp
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searchsanjaysharmaAuthor Commented:
ok
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Microsoft SQL Server 2005

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