Making a Control transparent (WinForms Application)

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C#2.0

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C#4.0

Hey there,

I was originally trying to add a background image to a Richtextbox when I quickly found out it could not be simply achieved. I kept reading on online and stumbled upon someone who said something about creating a new usercontrol adding a richtextbox and then implementing this code to work with a textbox rather than a label:

public class TransparentLabel : Label {
  public TransparentLabel() {
    this.SetStyle(ControlStyles.Opaque, true);
    this.SetStyle(ControlStyles.OptimizedDoubleBuffer, false);
  }
  protected override CreateParams CreateParams {
    get {
      CreateParams parms = base.CreateParams;
      parms.ExStyle |= 0x20;  // Turn on WS_EX_TRANSPARENT
      return parms;
    }
  }
}

So I tried:

public class UserControl1 : RichTextbox
    {
        public UserControl1()
        {
            this.SetStyle(ControlStyles.Opaque, true);
            this.SetStyle(ControlStyles.OptimizedDoubleBuffer, false);
        }
        protected override CreateParams CreateParams
        {
            get
            {
                CreateParams parms = base.CreateParams;
                parms.ExStyle |= 0x20;
                return parms;
            }
        }
    }

But I end up with the following error and I am unsure how to fix it:
Error 1 Missing partial modifier on declaration of type 'Stickies.UserControl1'; another partial declaration of this type exists

This error is on the following line:
public class UserControl1 : RichTextbox

Any help with my error or any help on another approach would be really helpful.
Thank you.