Aspose::Words::MailMerging::IMailMergeDataSource::GetChildDataSource method. The Aspose.Words mail merge engine invokes this method when it encounters a beginning of a nested mail merge region in C++....Aspose::Words::MailMerging::IMailMergeDataSource::GetChildDataSource method. The Aspose.Words mail merge engine invokes this method when it encounters a beginning of a nested mail merge region in C++.