Question

I searched a while and found no solution or do I just not see the little error?

I wrote a program with Visual C# and have
Form1.cs
Program.cs
Server.cs

Server.cs

---

namespace WindowsApplication1 {
class testServer {
public Form1 form1;
form1.send("data");

Program.cs

---

using System;
using System.Collections.Generic;
using System.Windows.Forms;

namespace WindowsApplication1 
{
static class Program
{
    /// <summary>
    /// The main entry point for the application.
    /// </summary>
    [STAThread]
    static void Main()
    {
        Application.EnableVisualStyles();
        Application.SetCompatibleTextRenderingDefault(false);
        Application.Run(new Form1());
    }
}
}

Form1.cs

---

namespace WindowsApplication1
{
public partial class Form1 : System.Windows.Forms.Form
{


    public Form1()
    {
        InitializeComponent();

    }
    private testServer Server;

private void startServer_Click(object sender, System.EventArgs e)
    {

        Server = new Server(data);
        Server.form1 = this;

    }

Everything works but in Server.cs I get a nullexception with form1.send("data");
It seems form1 is really null but why?

Where did I forget something?

Answer 1

You have to create an instance of Form1, try

public Form1 form1 = new Form1();