Changing a label’s text in another form in C#?

You need to expose your label or its property.

In form 2:

public string LabelText
{
    get
    {
        return this.labelX1.Text;
    }
    set
    {
        this.labelX1.Text = value;
    }
}

Then you can do:

form2 frm2 = new form2();
frm2.LabelText = this.button1.text;

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