How can I insert an image with id to a richtextbox in .NET?

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C#

.NET

image

RichTextBox

I just came across a problem with RichTextBox in .NET.

Using Insert Plain Text and Images into RichTextBox at Runtime[^] I can insert an image to the RichTextBox. Then what I want is that when the image in the RichTextBox is clicked, a MessageBox pops-up showing its name or id.

My question is: how can I embed the name or id of the image into the rtf of the RichTextBox?

I have tried to add parameters into the rtf string using: {\pict{\pictName myName}{\pictID myID}\wmetafile8...} and then set to richtextbox1.Rtf; but I found that there are still no parameters in

richtextbox1.Rtf:{\pict\wmetafile8...}
Is there any other way, except comparing the whole WmfBits to the list in the background, to get the image's name or id?

Thanks in advance.