vb.net - Betfair NG API Navigation Application Menu error -


i trying create betfair app written in vb.net using betfair ng api. trying request navigation menu in vb.net utilizing following instructions, here, error 400 bad request. send me code doing so? 

sub getnavigatormanu(byval sesstoken string, byval appkey string)      dim request httpwebrequest = nothing     dim response httpwebresponse = nothing       dim strresponsestatus string = ""     try         request = webrequest.create(new uri("https://api.betfair.com/exchange/betting/rest/v1/en/navigation/menu.json"))          request.accept = "application/json"         request.method = "get"         request.keepalive = true         request.contenttype = "application/json"         request.automaticdecompression = decompressionmethods.gzip or decompressionmethods.deflate         request.headers.add("accept-encoding", "gzip,deflate")         request.headers.add("x-authentication", sesstoken)         request.headers.add("x-application", appkey)          response = request.getresponse()         display status below          strresponsestatus = "status " & ctype(response, httpwebresponse).statuscode      catch ex exception         msgbox("createrequest error" & vbcrlf & ex.message)     end try     msgbox(strresponsestatus)  end sub


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