winforms - Setting a Panel's background color from a class, Windows Forms - C# -

i have relating setting panels background color class.

the class not within form of panel, side class.

the panel on main form called pnlcanvas.

i don't know missing. if have values or methods in main form, can access values class. but, panel seems acts different.

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public form1() {     initializecomponent();     changecolor changecolor = new changecolor(this);      changecolor.redpanel(); } 

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class changecolor  {     public form1 form1 { get; set; }     public changecolor(form1 form1)     {         this.form1 = form1;     }     public void redpanel()     {         form1.pnlcanvas.backcolor = color.red;     } } 

try this: make member of form1

    public void redpanel()     {         this.pnlcanvas.backcolor = color.red;     }