How load F1 for a main form & How to link topic from help file (.chm) with a specific form

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C#

Hi All

I have created a help file (.chm) for my system. When I call it in my application and click on the help icon, the help file loads but when i press F1 on the keyboard-the help file doesnt load.I designed my main form using ribbon.

Here is my code for F1:

private void MainForm_KeyUp(object sender, KeyEventArgs e)
        {

 if (e.KeyCode == Keys.F1)
            {
                try
                {
                    string filePath = "NMMU Residence System Help.chm";
                    System.Windows.Forms.Help.ShowHelp(null, filePath);

                }

                catch
                {
                    MessageBox.Show("Error displaying help", " ", MessageBoxButtons.OK, MessageBoxIcon.Error);

                }
            }
}

-this code doesnt give me errors when i run it.. What could i be doing wrong?

Also,how do i go about linking a specific topic to a selected form?

Thanks