[c#] How do I make an Event in the Usercontrol and have it handled in the Main Form?

I have a custom usercontrol and I want to do something relatively simple.

When ever a numeric up down in that usercontrol's value changes, have the main form update a display window.

This is not a problem if the NUD was not in a usercontrol but I can't seem to figure out how to have the event handled by the mainform and not the usercontrol.

one of the easy way to do that is use landa function without any problem like

userControl_Material1.simpleButton4.Click += (s, ee) =>
            {
                Save_mat(mat_global);
            };

For those looking to do this in VB, here's how I got mine to work with a checkbox.

Background: I was trying to make my own checkbox that is a slider/switch control. I've only included the relevant code for this question.

In User control MyCheckbox.ascx

<asp:CheckBox ID="checkbox" runat="server" AutoPostBack="true" />

In User control MyCheckbox.ascx.vb

Create an EventHandler (OnCheckChanged). When an event fires on the control (ID="checkbox") inside your usercontrol (MyCheckBox.ascx), then fire your EventHandler (OnCheckChanged).

Public Event OnCheckChanged As EventHandler

Private Sub checkbox_CheckedChanged(sender As Object, e As EventArgs) Handles checkbox.CheckedChanged
    RaiseEvent OnCheckChanged(Me, e)
End Sub

In Page MyPage.aspx

<uc:MyCheckbox runat="server" ID="myCheck" OnCheckChanged="myCheck_CheckChanged" />

Note: myCheck_CheckChanged didn't fire until I added the Handles clause below

In Page MyPage.aspx.vb

Protected Sub myCheck_CheckChanged (sender As Object, e As EventArgs) Handles scTransparentVoting.OnCheckChanged
    'Do some page logic here
End Sub

you can do like this.....the below example shows text box(user control) value changed

   // Declare a delegate 
public delegate void ValueChangedEventHandler(object sender, ValueChangedEventArgs e);
public partial class SampleUserControl : TextBox 
{    
    public SampleUserControl() 
    { 
        InitializeComponent(); 
    }

    // Declare an event 
    public event ValueChangedEventHandler ValueChanged;

    protected virtual void OnValueChanged(ValueChangedEventArgs e) 
    { 
        if (ValueChanged != null) 
            ValueChanged(this,e); 
    }    
    private void SampleUserControl_TextChanged(object sender, EventArgs e) 
    { 
        TextBox tb  = (TextBox)sender; 
        int value; 
        if (!int.TryParse(tb.Text, out value)) 
            value = 0; 
        // Raise the event 
       OnValueChanged( new ValueChangedEventArgs(value)); 
    }    
}

Try mapping it. Try placing this code in your UserControl:

public event EventHandler ValueChanged {
  add { numericUpDown1.ValueChanged += value; }
  remove { numericUpDown1.ValueChanged -= value; }
}

then your UserControl will have the ValueChanged event you normally see with the NumericUpDown control.