I have a related multilinugal site in umbraco 4.7.2 trying to delete and unpublish the documents using their relation in application base .cs file : 

My code is :

    var allDocId = SqlHelper.ExecuteScalar<Object>("Select nodeId from cmsDocument");

            Document currDoc = new Document(sender.Id);

            Relation[] relations = Relation.GetRelations(sender.Id);

            //Relation[] re = sender.Relations;

            foreach (var cDocId in allDocId.ToString())

            {

               foreach (var r in relations)

               {

                   int cId = int.Parse(cDocId.ToString());

                   if( cId == r.Child.Id)

                    {

                        Document delDoc = new Document(r.Child.Id);

                        if (delDoc.Published)

                        {

delDoc.UnPublish();

}

                        delDoc.delete();

                    }

                }

            }

I dont know why , but related document does not get deleted. can anyone help me for this problem.

thanks in advance.