Creating an Optional Date Parameter

[Learning SQL Server]

What should the default value for an optional Date parameter be in a
function if I want it to default to Nothing?

Setting the optional value to "" fails, so does setting it to Nothing.

Function blah(byval User as string, Optional byval UserDate as Date = ?????)

Thanks (again)

 

[Russell Jones]

Use DateTime.MinValue, and then check to make sure the passed value is
greater than that inside the function body.