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Unable to Create the Azure devops pipeline using REST Api call with .net code with c#
with out using integrated tool of VSTS

What I have tried:

httpWebRequest.ContentType = "application/json";
httpWebRequest.Method = "POST";

//passing PAT token in the header

httpWebRequest.Headers["Authorization"]= "Basic" + Convert.ToBase64String(System.Text.ASCIIEncoding.ASCII.GetBytes($"{personalaccesstoken}:{personalaccesstoken}"));

using (var streamWriter = new


string json = "";
var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();
using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
var result = streamReader.ReadToEnd();

//Request Body

    "definitionId": 1,
    "description": "test release",
    "artifacts": [
    "alias": "_ApplicationName",
    "instanceReference": {
    "id": "GUID",
    "name": "Environment like Dev OR QA "
    "isDraft": false,
    "reason": "none",
    "manualEnvironments": null

//once i run the code in the postman i am getting the repose as 200 Ok

//but when i check, release is not creating

//Please help me out how to proceed and need to creating Release pipeline through .net code

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