The following example demonstrates how to create a new dashboard parameter and pass it to a custom SQL query.
In this example, the dashboard parameter is passed to the custom SQL query parameter's expression. This allows you to dynamically change the query passed to the server.
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Added By: Markus Kvist at: 7/5/2015 3:30:19 AM
A much simpler way is to use the Query Builder directly, which also allows expressions exactly as was done in code below, unless you need the dynamic SQL: https://documentation.devexpress.com/#Dashboard/CustomDocument113947