Parameters Panel 
The Parameters panel displays all Parameters configured for the print layout.
Clicking the Add Parameter 
button opens the Add Parameter dialog. In the dialog you will see the following properties:
- Name: The name assigned to the parameter.
- Description: A description of the parameter.
- Type: The data type expected as input. If using an OBJECTID field as your input, this should be set to Number (32 bit integer).
- Visible: Determines whether the parameter is visible in the client application running the report.
- Multi-Value: When enabled, this property allows multiple values to be passed to the parameter.
- Allow Null: Determines whether null values can be passed as an input.
- Expression: An optional expression used to set a Value.
- Value: Provides a pre-defined value or values to be used when running a
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