Object reference is not non static member

Question

Hi Team

 

I need some help here below with my code, the code is trying to use servicebus message in order to receive output from power bi desktop. But i am getting the following error on this object reference;

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Configuration;
using Microsoft.Azure.ServiceBus;
using Microsoft.ServiceBus.Messaging;
namespace ACTS083ConsoleApplication
{
class Program
{
string ConnectionString = ConfigurationManager.AppSettings["Microsoft.ServiceBus.ConnectionString"];
EventHubClient client = EventHubClient.CreateFromConnectionString(ConnectionString, "pbidata");
static void Main(string[] args)
{
Int32 unixTimestamp = (Int32)(DateTime.UtcNow.Subtract(new DateTime(2019, 1, 1))).TotalSeconds;
Random r = new Random();
int currentValue = r.Next(0, 100);
string postData = String.Format("[{{\"ts\":{0},\"value\":{1}}]", unixTimestamp, currentValue);
client.Send(new EventData(Encoding.UTF8.GetBytes(postData)));
Console.WriteLine("Message sent. Press Enter to Continue");
Console.ReadLine();
}
}
}