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e.g.
var employee=from _employee in _db.Employes
where _employee.birthay.value＝＝null
select _employee;
The above statement when the program stops responding when VS.NET.
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The following fragment can run:
var employee=from _employee in _db.Employes
where _employee.birthay.value.ToString()＝＝null
select _employee;

We can't reproduce this problem using dotConnect for Oracle 5.20 Beta.
Just a tip: the code you provided looks a bit redundant - it should be enough to check only whether _employee.birthay == null.