private BranchOfKnowledge GetTheSameBranch(BranchOfKnowledge branch)
 {
     return((from b in db.BranchOfKnowledges where b.Name == branch.Name select b).ToList()[0]);
 }
 private bool IsBranchExist(BranchOfKnowledge branch)
 {
     return((from b in db.BranchOfKnowledges where b.Name == branch.Name select b).ToList().Count != 0 ? true : false);
 }