Json parse - logstash VB.net

Hi, I have a problem with parsing JSON data.
My source code:

> Dim xPoslatUmo As String = ConfigurationManager.AppSettings.Item("UMOPoslat")
>                If xPoslatUmo = "Ano" Then
>                    Dim request As WebRequest = WebRequest.Create(ConfigurationManager.AppSettings.Item("UMOServer"))
>                    request.Method = "POST"
>                    Dim postdata As String = "{""GENCELEK"":""SAS_CALLC""},{""GENMSGTEXT"":""info""},{""Volat"":" + xvolat + "},{""Stav"":""" + xstav + "},{""Info"":""" + Left(xinfo, 255) + "}"
>                    Dim byteArray As Byte() = Encoding.UTF8.GetBytes(postdata)
>                    request.ContentType = "application/x-www-form-urlencoded"
>                    request.ContentLength = byteArray.Length
>                    Dim dataStream As Stream = request.GetRequestStream()
>                    dataStream.Write(byteArray, 0, byteArray.Length)
>                    dataStream.Close()
>                    Dim response As WebResponse = request.GetResponse()
>                    mlog.LogujKontroly(postdata)
>                    mlog.LogujKontroly("Poslani UMO " + (CType(response, HttpWebResponse)).StatusDescription)
>                    response.Close()
>                Else
>                    mlog.LogujKontroly("Poslani UMO  - je nastaveno neposilat")
>                End If

at logstash parsing error:
{"timestamp":"20220525","tags":["_jsonparsefailure"],"message":"{"Volat":Volat},{"Stav":"KO},{"Info":" Kampan: out_prodej_lead_pad_vypis_poplatku je ve stavu Activated}","headers":{"http_host":"12.34.56.78:9771","request_path":"/","connection":"Keep-Alive","http_user_agent":null,"http_accept":null,"content_length":"104","http_version":"HTTP/1.1","content_type":"application/x-www-form-urlencoded","request_method":"POST"},"host":"12.34.56.78","@timestamp":"2022-05-25T19:02:43.723Z"}

Thank you for advice.

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