Argument problem with an XSD stored proc with output parameter

[Guest]

I am trying to use an XSD generated function which needs a parameter of type
'ref System.Guid?' I am passing it a 'ref System.Guid', but am getting the
following error: "cannot convert from 'ref System.Guid' to 'ref System.Guid?'
" So the question is what does the question mark mean and how can I make the
variable I am passing to the correct type?

Thanks

 

[Graeme Bradbury]

System.Guid? is a nullable type
ie. It's System.Guid that can also accept null.
The MSDN for it is at
http://msdn2.microsoft.com/en-us/library/1t3y8s4s(VS.80).aspx

Assuming you're creating the guid and then calling your method.
rather than:

Guid g = Guid.NewGuid();
SomeMethod (ref g);

you would
Guid? g = Guid.NewGuid();
SomeMethod (ref g);

 

[Guest]

Thanks Graeme, I'm going to do some reading on nullable types now.