Hello,
I set some default values though Code for a few parameters in my report, is
there any way I can relate parameters to each other such as once I change one
parameter I want to pass it to the code and define default value for another
parameter and refresh the screen.
Thanks,

I don't think so. You can have cascading parameters for the choices for the
users but not the defaults. The reason is that defaults are used for
subscriptions where there is no user interaction.

As a test, try putting in an expression for a default that looks like this:

=Parameters!ADifferentParameter.value

If it lets you do this then you can do what you want. My guess is that it
won't allow it.


--
Bruce Loehle-Conger
MVP SQL Server Reporting Services

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