Report expressions support a variety of references to built-in functions and built-in collections. Expressions must have valid Visual Basic syntax before a report can be published or processed.
To develop complex expressions or expressions that use custom code or custom assemblies, we recommend that you use Report Designer in SQL Server Data Tools (SSDT). For more information, see Custom Code and Assembly References in Expressions in Report Designer (SSRS).
You can create and modify paginated report definition (.rdl) files in Report Builder and in Report Designer in SQL Server Data Tools. Each authoring environment provides different ways to create, open, and save reports and related items.
Use the topics in this section to help write simple expressions in a report.