The following example shows how to specify default parameter values on dashboard loading. To do this, handle the DashboardViewer.DashboardLoaded event, get access to the dashboard object using the DashboardLoadedEventArgs.Dashboard event parameter and specify the default value(s) using the Dashboard.Parameters["parameterName"].Value property.
See also: How to pass a hidden dashboard parameter to a custom SQL query in the WinForms Viewer
See also: How to pass a hidden dashboard parameter to a custom SQL query in the WinForms Viewer