WindowsApplication C# constructor: Form1 could not be found

Question

I'm a new c# user, while creating Win-App I got error and I search here on Stackoverflow but couldn't fix my problem. I looked at Type or namespace could not be found 'Form1'

Error 1 The type or namespace name 'Form1' could not be found

Code:

namespace WindowsApplication3
{

public partial class Form1 : Form
{

    System.Net.Sockets.TcpClient clientSocket = new System.Net.Sockets.TcpClient();

    public Form1()
    {

        InitializeComponent();

    }

1. I tried to rename my Form1 to something else but it gives me the same error.

2. I checked all the references and they seem to be in order.

Answer 1

I suspect a namespace error.

Is the Form in a namespace called WindowsApplication3 and the Program class in a namespace called WindowsFormsApplication3 by any chance?

Ensure you are using the same namespace for both, or alternatively add a using to Program.cs to specify the correct namespace.