C# .net 3.5 post json httpclient

 System.Net.WebClient client = new System.Net.WebClient();
 client.Headers.Add("content-type", "application/json");//set your header here, you can add multiple headers
 string s = Encoding.ASCII.GetString(client.UploadData("http://localhost:1111/Service.svc/SignIn", "POST", Encoding.Default.GetBytes("{\"EmailId\": \"admin@admin.com\",\"Password\": \"pass#123\"}")));

Source: stackoverflow.com

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