using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Text;
using System.Net;
using System.IO;
public partial class _Default : System.Web.UI.Page 
{
 //https://www.aspsnippets.com/Articles/How-to-transfer-data-from-one-website-to-another-in-ASPNet.aspx
 
 
 protected void Button1_Click(object sender, EventArgs e)
 {
 //string remoteUrl = "http://localhost:54358/PostDataFromOneWebsiteToAnother/Page2_CS.aspx";
 string remoteUrl = "http://localhost:12924/Dengue/getApi.aspx";
 string firstName = "Varun";
 string lastName = "Sharma";
ASCIIEncoding encoding = new ASCIIEncoding();
 string data = string.Format("FirstName={0}&LastName={1}", firstName, lastName);
 byte[] bytes = encoding.GetBytes(data);
 HttpWebRequest httpRequest = (HttpWebRequest)WebRequest.Create(remoteUrl);
 httpRequest.Method = "POST";
 httpRequest.ContentType = "application/x-www-form-urlencoded";
 httpRequest.ContentLength = bytes.Length;
 using (Stream stream = httpRequest.GetRequestStream())
 {
 stream.Write(bytes, 0, bytes.Length);
 stream.Close();
 }
 }
}
 
 
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here I am fetching data but not able to show in textbox
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
public partial class getApi : System.Web.UI.Page
{
 string firstName;
 string lastName;
 
 protected void Page_Load(object sender, EventArgs e)
 {
txtLname.Text = Request.Form["FirstName"];
 //lastName = Request.Form["LastName"];
 
 }
 
}