Reporting services validating parameters
When you run the report, the report processor evaluates each expression as it combines report data and report layout elements such as tables and charts.
As you design a report, many expressions for report items are set for you.
Three fields have been added to the table: [Name], [Code], and [Sales].
The notation [Name] on the design surface represents the underlying expression .
Note You can create and modify paginated report definition (.rdl) files in Report Builder and in Report Designer in SQL Server Data Tools.
If a text box contains multiple expressions, each expression is the value of placeholder text in the text box.By default, expressions appear on the report design surface as .Formulas are calculations performed on values in a report that are based on data from a report model.Expressions help you control the content, design, and interactivity of your report.Expressions are written in Microsoft Visual Basic, saved in the report definition, and evaluated by the report processor when you run the report.