Question

Would like to know if methods need to be static in a C# assemble to be access from SSRS?

Answer 1

No, you can use both public methods and static methods in a c# class library and reference them from your SSRS report.

You do need to add static methods in a different way than your public instance methods though. You should check out this MS article on custom code use in SSRS. Here is the gist of how to add a static method:

The Classes section is only for
instance-based members. It is not for
static members. Static (also referred
to as "shared" in some of our
Reporting Services documentation)
means that the member is available to
every instance of the class and every
instance uses the same storage
location. Static members are declared
by using the shared keyword in
Microsoft Visual Basic and the static
keyword in C#. This can be a bit
confusing. What this means is, if your
custom assembly contains instance
members that you need to access, you
will have to specify the class name
and instance name in the Classes
section. Because the method I will be
calling from Reporting Services was
defined as static by using the shared
keyword in Visual Basic, I’ll use the
References section instead of the
Classes section.

So, if you want to do an instance method, make sure to add the refrence, but also specify a "Class" and "Instance name" in the Classes section of Report Properties for every method you need. Then call them using an expression of =Code. Like so:

=Code.InstanceName.Method

Hope that will help you out.