By default, markers cannot be hidden based on the condition, only the whole series can be hidden.
To achieve the required behavior, you can hide the markers of the existing LineSeries and add a second LineSeries
with markers only (bound to the same data source). The idea of the additional LineSeries is to display the data points conditionally using the required expression in DataPointConditionalFormatting property.
Legend item of the additional series can be hidden with LegendItem.Style.Visible property set to false
The attached report demonstrates the above approach. It can be opened in Standalone Designer R2 2017 and it uses some sample data from AdventureWorks SQL database.
Hope this will help.
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