Using the built-in properties of the report parameters (during report design-time)
you are able to configure one or more parameters to be required by setting their AllowNull
properties to False
However, these properties do not offer an option to make a group of parameters required e.g., at least
one parameter of the whole group to have a value. Thus, in order to achieve the described effect, you will need to hide the default report parameters area (set Visible
for all report parameters) and implement your own custom parameters UI and validation in your application.
After the values from the custom UI have been validated, you can pass them via the Report Source
to the report.
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