I have this code in a Panel control:

private void UserControl1_Paint(object sender, PaintEventArgs e)
{
    Rectangle BaseRectangle = new Rectangle(0, 0, this.Width - 1, this.Height - 1);
    Brush Gradient_Brush = new LinearGradientBrush(BaseRectangle, Color.Navy, Color.LightSlateGray, LinearGradientMode.Vertical);
    e.Graphics.FillRectangle(Gradient_Brush, BaseRectangle);
}

I want to change it to this, but I don't know the syntax to raise the Paint event.

private LinearGradientMode _GradientMode = LinearGradientMode.Vertical;
public LinearGradientMode GradientMode
{
    get { return _GradientMode; }
    set 
    {
        _GradientMode = value;
        // Raise the event here
    }
}

private Color _ColorStart = Color.White;
public Color ColorStart
{
    get { return _ColorStart; }
    set 
    { 
        _ColorStart = value;
        // Raise the event here
    }
}

private Color _ColorEnd = Color.White;
public Color ColorEnd
{
    get { return _ColorEnd; }
    set
    {
        _ColorEnd = value;
        // Raise the event here
    }
}

private void UserControl1_Paint(object sender, PaintEventArgs e)
{
    Rectangle BaseRectangle = new Rectangle(0, 0, this.Width - 1, this.Height - 1);
    Brush Gradient_Brush = new LinearGradientBrush(BaseRectangle, _ColorStart, _ColorEnd, _GradientMode);
    e.Graphics.FillRectangle(Gradient_Brush, BaseRectangle);
}