C# object does not contain a definition for method

Question

I apologize for the stupid question but I'm new to C# and have not been able to find help from the other questions related to this error.

I've created a class called "Sender" but I can't access my method when I instantiate an object. When I try and call my method I get the error: "object does not contain a definition for sendMessage." I don't know where I am going wrong. Please point me in the right direction.

Thanks for your help!

This is my Sender class:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Net;
using System.Net.Sockets;
using System.Net.NetworkInformation;

namespace CS5200_HW1_GUI
{
    public class Sender
    {
        private UdpClient myUdpClient;
        private IPEndPoint localEP;
        string ipAddress = "129.123.41.1";
        string _port = "12001";

        public void sendMessage()
        {

        }
       // byte[] sendBuffer = Encoding.Unicode.GetBytes(command);
       // int result = myUdpClient.Send(sendBuffer, sendBuffer.Length, localEP);

     }
 }

This is where I'm trying to call the method:

    using System;
    using System.Collections.Generic;
    using System.ComponentModel;
    using System.Data;
    using System.Drawing;
    using System.Linq;
    using System.Text;
    using System.Threading.Tasks;
    using System.Windows.Forms;
    using System.Net;
    using System.Net.Sockets;
    using System.Net.NetworkInformation;

    namespace CS5200_HW1_GUI
    {
         public partial class Form1 : Form
         {
              //private UdpClient myUdpClient;
              IPEndPoint localEP = new IPEndPoint(IPAddress.Any, 0);
              string command = string.Empty;
              string newWord = String.Empty;
              string guess = String.Empty;
              string dashes = String.Empty;
              string newAddress = string.Empty;
              string newPort = string.Empty;
              int score = 0;
              int length = 0;
              StringBuilder sb = new StringBuilder();
              Random random = new Random();

              Sender sender = new Sender();

              private void button1_Click(object sender, EventArgs e)
              {
                   command = "NewGame";
                   sender.sendMessage(command);             //I get the error here
                   newWord = receiver.receiveMessage();
                   length = newWord.Length;
              }
        }
    }

Answer 1

This happens because sender is both an Sender object and also one of the arguments of the click handler.

Pay attention to the method signature:

private void button1_Click(object sender, EventArgs e)

You are referring to the closest sender, which is of type object . To solve this you have to rename either or call it with this .

Example:

this.sender.sendMessage()

Answer 2

You are calling sender.sendMessage with a argument ( command )

The only function called sendMessage on the Sender object does not take any parameters, so a matching method is not found.

You also are using the sender variable, which is a variable within the Click method (due to the signature). You should use a different name.