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' For complete examples and data files, please go to https://github.com/groupdocs-viewer/GroupDocs.Viewer-for-.NET
' Create new instance of GroupDocs.Viewer.Metered class
Dim metered As New Global.GroupDocs.Viewer.Metered()

' Set public and private keys
Dim publicKey As String = "***"
Dim privateKey As String = "***"

' Set public and private keys to metered instance
metered.SetMeteredKey(publicKey, privateKey)