[Solved] ASP.Net Error: object reference is required for the non-static field, method, or property Type.get

HI Dharmendr Sir;

i have run the code of google line chart and got an error;

Error:

Error 1 An object reference is required for the non-static field, method, or property 'redirectAnotherPageLineChart.WebForm1.Type.get' 

my code is here:

c# 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;
using System.Web.Services;

namespace redirectAnotherPageLineChart
{
    public partial class WebForm1 : System.Web.UI.Page
    {
        protected string Type { get; set; }
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                Type = !string.IsNullOrEmpty(HttpContext.Current.Request.QueryString["Type"]) ? HttpContext.Current.Request.QueryString["Type"] : "0";
            }
        }
        [WebMethod]
        public static List<object> GetChartData(string ipAddress)
        {
            string query = string.Format("SELECT [pingtime],[average] FROM [dbo].[graph] WHERE ipaddress='{0}' AND CONVERT(DATE,pingtime,103) BETWEEN CONVERT(DATE,DATEADD(DAY, -7, GETDATE()),103) AND CONVERT(DATE,GETDATE(),103) ORDER BY CONVERT(DATETIME,pingtime,103) ASC", ipAddress); ;
            switch (Type)
            {
                case "1":
                    query = string.Format("SELECT [pingtime],[average] FROM [dbo].[graph] WHERE ipaddress='{0}' AND CONVERT(DATE,pingtime,103) BETWEEN CONVERT(DATE,DATEADD(MONTH, -1, GETDATE()),103) AND CONVERT(DATE,GETDATE(),103) ORDER BY CONVERT(DATETIME,pingtime,103) ASC", ipAddress);
                    break;
                case "2":
                    query = string.Format("SELECT [pingtime],[average] FROM [dbo].[graph] WHERE ipaddress='{0}' AND CONVERT(DATE,pingtime,103) BETWEEN CONVERT(DATE,DATEADD(MONTH, -2, GETDATE()),103) AND CONVERT(DATE,GETDATE(),103) ORDER BY CONVERT(DATETIME,pingtime,103) ASC", ipAddress);
                    break;
                case "3":
                    query = string.Format("SELECT [pingtime],[average] FROM [dbo].[graph] WHERE ipaddress='{0}' AND CONVERT(DATE,pingtime,103) BETWEEN CONVERT(DATE,DATEADD(MONTH, -6, GETDATE()),103) AND CONVERT(DATE,GETDATE(),103) ORDER BY CONVERT(DATETIME,pingtime,103) ASC", ipAddress);
                    break;
                default:
                    break;
            }
            string constr = ConfigurationManager.ConnectionStrings["dbcs"].ConnectionString;
            List<object> chartData = new List<object>();
            using (SqlConnection con = new SqlConnection(constr))
            {
                using (SqlCommand cmd = new SqlCommand(query))
                {
                    cmd.CommandType = CommandType.Text;
                    cmd.Connection = con;
                    con.Open();
                    using (SqlDataReader sdr = cmd.ExecuteReader())
                    {
                        while (sdr.Read())
                        {
                            chartData.Add(new object[] { Convert.ToDateTime(sdr["pingtime"]), sdr["average"] });
                        }
                    }
                    con.Close();

                    return chartData;
                }
            }
        }
    }
}

please help me to fix it.