When you use the In operator the right side of the filter must contain a collection of objects. Such can be created from listed values by using the built-in Array utility function
In your code snippet, you specify the values as follows:
to create a valid collection of the above values, the expression must be modified to:
The recommended approach is to test creating sample reports with the VS Report Designer, which will let you check all required settings and validate your code through the code auto-generated in the report's designer.cs|vb file.
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