Add Reference failed

[zhshqzyc]

Hi,

I want to add a reference to a project.
The steps are:

On the Project menu,

click References. 
Click to select the check box next to the component you want to add. If the component is not listed, locate the .dll or .ocx file using Browse. 
Click OK.

Then I opened the project menu again, check the reference but no change.

Why?


Thanks