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Nothing I have tried so far has worked...
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Comments in SSRS Expressions are implemented with a single quote. Comments can be added either on the same line as the expression or on the next line. Comments cannot be added in the beginning or middle of the expression. There is no concept of multi-line comments.
Functions are almost always used at some point within an expression. A particular function we are going to touch on in this article is called IsNothing. This function will let you inspect the value of an object to find out if it is NULL or not.
Report expressions are the powerful features of JasperReports, which allow us to display calculated data on a report. Calculated data is the data that is not a static data and is not specifically passed as a report parameter or datasource field.
To add SSRS Report Parameters, Right Click on the Parameters Folder present in the Report Data tab will open the Context Menu to select Add parameters.. option. Once you click on Add parameters.. option opens a new window called Report parameter Properties to configure the parameter properties in SSRS.
To comment out source code that is placed within the code section of the Page Properties of a Reporting Services .rdl file simply place an apostrophe in front like so.
'ADD YOUR CODE HERE
Take a look at the following article on SQL Server Central:
Adding Custom Code to Reporting Services
You can also use an apostrophe to place comments in an Expression withing Reporting Services controls. This only appears to work if the comments come after the expression defintion. For example:
= "Test"
'Add Your comments here
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