upload JSONobject to web server

I am writing a client application for a networked device. The device requires that control values are changed using html "POST" and sending form data containing a JSON object. The devices has some sample commands using CURL that work fine and I am able to capture the "POSTs" using Wireshark. Here is a capture of a good transaction:

Good Wireshark
I am using VB.NET to write my client application and using WebRequest I can send the value pair but the form data is missing the "json=" part of the data:

Failed Data
This is the code I have so far:

        Using sendto As New Net.WebClient
            Dim param As New Specialized.NameValueCollection
            param.Add(theName, theValue)
            Dim response_bytes = sendto.UploadValues(uri, "POST", param)
            Dim response_body = (New Text.UTF8Encoding).GetString(response_bytes)
        End Using

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The server rejects the post and closes the connection.

I have searched but cannot find a way to get this data correct. Any pointers would be much appreciated,
Sid PriceSoftware Systems Architect/DesignerAsked:
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ste5anSenior DeveloperCommented:
I would normally start coding POCO's to store the data which are covered by this JSON. Then I would use Newtonsoft.JSON (add the package with nuget).

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Rainer JeschorCommented:
how do go generate / get
param.Add(theName, theValue)

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They should look like:
theName = "json"
theValue = "{""value"" : ""1.18""}"
param.Add(theName, theValue)

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This should then look identical to your CURL.

Sid PriceSoftware Systems Architect/DesignerAuthor Commented:
st5an ... since this client application is very simple I decided to use the system.net.sockets API and generate the mostly fixed HTML header in my code. This has allowed me to resolve my issue.
Sid PriceSoftware Systems Architect/DesignerAuthor Commented:
The answer given by the expert was not a full solution and what I eventually implemented myself resolved the issue.
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