Get a token from a rest api with vbnet. Method POST

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Visual-Studio

I am trying to get a token from a ws but so far I have not succeeded. From postman if I get the token but from my vbnet application no. The code I use in vbnet is:

Dim client = New RestClient("https://xxxxxxxx.com/IntegrationAPI_2/api/login")
Dim request2 = New RestRequest(Method.POST)
request2.AddParameter("application/json", ParameterType.RequestBody)
request2.RequestFormat = DataFormat.Json
request2.AddParameter("Username", UserVar)
request2.AddParameter("Password", PasswVar)
Dim response2 As RestResponse = client.Execute(request2)

What I have tried:

The result obtained in vbnet in statuscode is 0, but in postman it is 200 ok

I am programming in visual studio 2015. Thanks