Report parameters can be configured in the ReportParameter Collection Editor
and they need to be visible in order to be shown in the parameters area: screenshot
The parameters area will be positioned above the report and may have different UI depending on the used Report Designer
or the used Report Viewer
In case you see a warning message that the required parameters do not have values you need to provide default values for them or set their AllowNull
properties to True
Check out the Telerik Platform - the only platform that combines a rich set of UI tools with powerful cloud services to develop web, hybrid and native mobile apps.