Changing the Label1.Text of Form1 from Form2 Button1

I am trying to change the Label1.Text on my Form1 (owner) by Button1_Click triggered from Form2, but there are no changes on Label1.Text. It is still empty string (""). I have double/triple checked my code. I could not find anything wrong.

Here's what I have done so far:

Form1
    // Label1 is inside the TabControl Page 0
    // Label1.Modifier property already set to public
    // and Label1.Text = ""

    public static FrmOwner Self;

    public FrmOwner()
    {
        InitializeComponent();
        Self = this;        
    }

    private void Button2_Click()
    {
        FrmForm2 frm = new FrmForm2 ();
        frm.ShowDialog();
    }

Form2
    public FrmForm2()
    {
        InitializeComponent();      
    }

    private void Button1_Click(object sender, EventArgs e)
    {
        FrmOwner.Self.Label1.Text = "Changed Text";
    }

I am sure there's something wrong with my code, definitely. Please help.

CodePudding user response：

You can pass Form1 instance to Form2. Then access From1 public methods and properties from From2.

Form1

public static FrmOwner Self;

public FrmOwner()
{
    InitializeComponent();
    Self = this;        
}

private void Button2_Click()
{
    FrmForm2 frm = new FrmForm2 (this);
    frm.ShowDialog();
}

public void SetLabel(string txt)
{
   Label1.Text = txt
}

Form2

private FrmForm1 _frm1;

public FrmForm2(FrmForm1 frm1)
{
    _frm1 = frm1;

    InitializeComponent();      
}

private void Button1_Click(object sender, EventArgs e)
{
    _frm1.SetLabel("New Text");
}