getting error from page load event while calling method

protected void Page_Load(object sender, EventArgs e)
  {
      EnvironmentSpecificRequestUrl();
  }
  private void EnvironmentSpecificRequestUrl()
  {
      throw new NotImplementedException();
  }

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class test123 : System.Web.UI.Page
{


    protected void Page_Load(object sender, EventArgs e)
    {


        EnvironmentSpecificRequestUrl();
    }
  
    public static Uri EnvironmentSpecificRequestUrl(HttpRequestBase request)
    {
//.........
//........
    }
}