Ways to send data using POST Method and Get/Read response in .NET, Using HTTPWebRequest and WebClient

Way 1:

NameSpace:

using System.Net;

using System.Collections.Specialized;

Source Code: 

To Post Form fields to respective site your must be pass the input fields with 

request page fields name with required values as per my below example first_name, 

last_name,gender.... these all are the request parameters/fields of target site 

and FName,LName, Gender... these are the my page input fields value using web client 

we can eassly call the service and capture the response from their end.
                
In my response i show how do we get the response id from the received JSON data. 

here unique id is my respose data that is received from the requested api using 

post method

using (WebClient client = new WebClient())
{
    client.UseDefaultCredentials = true;
    client.Headers.Add("Authorization", "BASIC " + AuthKey);

    byte[] response =
    client.UploadValues(URI, new NameValueCollection()
    {
        { "first_name", FName },
        { "last_name", LName },
        { "gender", Gender },
        { "date_of_birth",DOB },
        { "email", Email },
        { "variable_six", Var6 },
        { "variable_three", Var3 },
        { "variable_four", Var4 },
        { "marketing", Marketing},
        { "variable_two", Var2 },
        {"terms_and_conditions", TNC},
        { "validation_token", Token},
        { "variable_five", Var5 }                       
    });

    string result = System.Text.Encoding.UTF8.GetString(response);
    if (result.Length > 0) {
        var dict = new System.Web.Script.Serialization.JavaScriptSerializer()

                     .Deserialize>(result);
        var MyId = UniqueId = dict["id"].ToString();
    }
}   

Way 2:

Namespace:

using System.Net;
using System.Text;
using System.IO;

Source Code: 
To Post Form fields to respective site your must be pass the input fields with  

request page fields name with required values as per my below example first_name, 

 last_name,gender.... these all are the request parameters/fields of target site  

and FName,LName, Gender... these are the my page input fields value using 

HttpWebRequest we can call the service and capture the response from their

 end.
                
In my response i show how do we get the response id from the received JSON data. 

 here unique id is my response data that is received from the requested api using  

post method

string postString = string.Format("first_name:{0},last_name:{1},gender:{2},date_of_birth:{3},email:{4},variable_six:{5},variable_three:{6},variable_four:{7},marketing:{8},variable_two:{9},terms_and_conditions:{10},validation_token: {11},variable_five: {12}"
    , FName, LName, Gender, DOB, Email, Var6, Var3, Var4, Marketing, Var2, TNC, Token, Var5);

HttpWebRequest httpRequest =
(HttpWebRequest)WebRequest.Create(URI);

httpRequest.Method = "POST";
httpRequest.ContentType = "application/x-www-form-urlencoded";              
httpRequest.Headers.Add("Authorization", "BASIC " + AuthKey);
httpRequest.UseDefaultCredentials = true;

byte[] bytedata = Encoding.UTF8.GetBytes(postString);
httpRequest.ContentLength = bytedata.Length;

Stream requestStream = httpRequest.GetRequestStream();
requestStream.Write(bytedata, 0, bytedata.Length);
requestStream.Close();


HttpWebResponse httpWebResponse =
(HttpWebResponse)httpRequest.GetResponse();
Stream responseStream = httpWebResponse.GetResponseStream();

StringBuilder sb = new StringBuilder();

using (StreamReader reader =
new StreamReader(responseStream, System.Text.Encoding.UTF8))
{
    string line;
    while ((line = reader.ReadLine()) != null)
    {
        sb.Append(line);

        var dict = new System.Web.Script.Serialization.JavaScriptSerializer().Deserialize>(line);
        var  UniqueId = dict["id"].ToString();
    }
}