public event BeforeExportDocumentWebEventHandler BeforeExportDocument

Public Event BeforeExportDocument As BeforeExportDocumentWebEventHandler

using DevExpress.DashboardWeb;
// ...
DashboardConfigurator.Default.BeforeExportDocument += Default_BeforeExportDocument;
// ...
private static void Default_BeforeExportDocument(object sender, BeforeExportDocumentWebEventArgs e) {
    // Hides a dashboard item with the specified name from the exported document.
    e.HideItem("gridDashboardItem1");

    // Hides all filter elements from the exported document.
    e.HideItem((DashboardItem item) => item is FilterElementDashboardItem);
}

Imports DevExpress.DashboardWeb
' ...
Private DashboardConfigurator.Default.BeforeExportDocument += Default_BeforeExportDocument
' ...
Private Shared Sub Default_BeforeExportDocument(ByVal sender As Object, ByVal e As BeforeExportDocumentWebEventArgs)
    ' Hides a dashboard item with the specified name from the exported document.
    e.HideItem("gridDashboardItem1")

    ' Hides all filter elements from the exported document.
    e.HideItem(Function(TypeOf item As DashboardItem) item Is FilterElementDashboardItem)
End Sub