Question

I have a UserControl, that contains a panel, the panel contains a picture box.
When I MouseMove over the Picture Box, I want to update a label on the MainForm.
I have a get/set method on the main form, but how do I use it?? thanks

  public partial class MainForm : Form
    {
        public MainForm()
        {
            InitializeComponent();
        }
        public String MouseCords
        {
            get { return this.MouseCordsDisplayLabel.Text; }
            set { this.MouseCordsDisplayLabel.Text = value; }
        }
    }


    public partial class ScoreUserControl : UserControl
    {
        public ScoreUserControl()
        {
            InitializeComponent();
        }

        private void ScorePictureBox_MouseMove(object sender, MouseEventArgs e)
        {
            // MainForm.MouseCords("Hello"); //What goes here?
        }
    }

Answer 1

Actually it’s possible to do in your case like:

((MainForm)this.ParentForm).MouseCords = "Some Value Here";

But the right way is with events like Felice Pollano mentinoed:

public partial class MainForm : Form
{
    public MainForm()
    {
        InitializeComponent();

        this.myCustomControlInstanse.PicureBoxMouseMove += new EventHandler<StringEventArgs>(myCustomControlInstanse_PicureBoxMouseMove);
    }

    private void myCustomControlInstanse_PicureBoxMouseMove(object sender, StringEventArgs e)
    {
        this.MouseCordsDisplayLabel = e.Value // here is your value
    }
}


public class StringEventArgs : EventArgs
{
    public string Value { get; set; }
}

public partial class ScoreUserControl : UserControl
{
    public event EventHandler<StringEventArgs> PicureBoxMouseMove;

    public void OnPicureBoxMouseMove(String value)
    {
        if (this.PicureBoxMouseMove != null)
            this.PicureBoxMouseMove(this, new StringEventArgs { Value = value });
    }

    public ScoreUserControl()
    {
        InitializeComponent();
    }

    private void ScorePictureBox_MouseMove(object sender, MouseEventArgs e)
    {
        this.OnPicureBoxMouseMove("Some Text Here");
    }
}