Drawing a custom shape icon

I am creating a custom control in c # winforms. I added ICON to the resource, this icon is then drawn on the control using the following code:

using (Icon oIcon = Properties.Resources.DropDownCustom)
{
    Rectangle RectangleIcon = new Rectangle((DropDownRectangle.X + ((DropDownRectangle.Width / 2) - (oIcon.Width / 2))),
        (DropDownRectangle.Y + (((DropDownRectangle.Height / 2) - (oIcon.Height / 2)) + 1)),
        oIcon.Width,
        oIcon.Height);
    graphics.DrawIcon(oIcon, RectangleIcon);
}

All this works fine, but I decided to add a parameter to the control properties, to allow the developer to load his own icon, and not use the one that I posted in the resource. I created a private icon variable:

private Icon _DropDownCustom;

changed the "using" line in the above code as follows:

using (Icon oIcon = _DropDownCustom)

and then added the following line to the constructor to set the default value to the value specified in the resources.

_DropDownCustom = Properties.Resources.DropDownCustom;

Then I added the Icon property so that the developer can use his icon:

[Category("Appearance"), DisplayName("IconDropDown")]
public Icon IconDropDownCustom
{
    get { return _DropDownCustom; }
    set { _DropDownCustom = value; this.Invalidate(); }
}

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EDIT: "Using(){}" :

Icon oIcon = _DropDownCustom;
Rectangle RectangleIcon = new Rectangle((DropDownRectangle.X + ((DropDownRectangle.Width / 2) - (oIcon.Width / 2))),
    (DropDownRectangle.Y + (((DropDownRectangle.Height / 2) - (oIcon.Height / 2)) + 1)),
    oIcon.Width,
    oIcon.Height);
graphics.DrawIcon(oIcon, RectangleIcon);

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