bin/*.dll file missing method after build and rebuild

[vise systems]

Hello,

I inherit a website and it was written in an old version of VS (I have vs express 10), when i try to load the solution it try to convert it to compatible vs 10 version with no success.

then I added the website into the empty solution.

I added some member functions (C#) and then try to build it, but got the following error

Error 63 'ASP.admin_categoryedit_aspx' does not contain a definition for 'test' and no extension method 'test' accepting a first argument of type 'ASP.admin_categoryedit_aspx' could be found (are you missing a using directive or an assembly reference?) C:\Users\Dvir\Documents\My Web Sites\IstrubalNew\admin\CategoryEdit.aspx 16 18 C:\...\IstrubalNew\

then i look inside the dll to see that the new function was not added ("test" function) i try to delete the dll file and complie again, no success.

anyone have idea about how to add my new function into this old DLL file ?

I'm adding an iamge to shade more light on my problem

http://i52.tinypic.com/34ifcyx.png

[Frinavale]

You can't add code into a compiled DLL.
But, you can write a new DLL that includes the old DLL.

Start a new project, include the old DLL into this project. Add a new class to the project and in that class be sure to import/use the old DLL.

Now you can expand upon the existing code.

-Frinny