C#: fix code
C#: fix code

ONLYOFFICE/document-server-integration,ONLYOFFICE/document-server-integration,ONLYOFFICE/document-server-integration,ONLYOFFICE/document-server-integration,ONLYOFFICE/document-server-integration,ONLYOFFICE/document-server-integration,ONLYOFFICE/document-server-integration,ONLYOFFICE/document-server-integration