C# - How to change the text of the label1 by another class?

Declare label1 as global

HOW?

BuggyCoder

Error does not appear, but also not working.

Form1.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace testeXX
{
    public partial class Form1 : Form
    {
        Class1 c = new Class1();

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            c.metodo();
        }
    }
}

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Class1.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace testeXX
{
    public class Class1
    {
        private void metodo(Label label1 )
        {
            //label1.ForeColor = Color.Red;
            label1.Text = "Hello World !! ";
        }

        internal void metodo()
        {
            //throw new NotImplementedException();
        }
    }
}

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Idle_Mind, I use this example in the future.

In this time I need an example as above in my last answer.

I think you have a good and rational reason to discourage me to use a global label!
Why?
I do not want to put the hand in the house of the snake in the dark.
But my reason for wanting to do this?

My form1.cs with this 12000 lines.
It`s getting difficult to maintain.
So I want to divide it into 4 pieces or:
form1.cs, part2.cs, part3.cs, part4.cs.

Thanks for always helping me.
ocaccy

I try, but.

It worked.
In the next question will extend this question,
Thanks for the great help and advice too.
ocaccy