De-compile DLL file to source code

Hi Experts.

I have a problem like this: i have a DLL file without source code from the previous programmer who build our business system.

How can I de-compile this DLL file to source code, I have use dotPeek and get the defined variables, but the function is unable to de-compile with the message:

// ISSUE: unable to decompile the method.

Is there anyway to solve this problem?

Thanks for reading this.
LVL 2
ldvhaiAsked:
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ste5anSenior DeveloperCommented:
"Decompiling" gives you maybe a working source, you still need to rewrite it (building the solution structure, unit tests, correct naming, documentation). So it will be a lot of work.. I would ask the previous developer, where the source is located. Otherwise, do a clean (green field) rewrite.
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Dr. KlahnPrincipal Software EngineerCommented:
The success of decompilation depends quite a bit on how much debugging and trace support was left in the DLL, and what level of code optimization was applied.

<opinion>
If the original author was competent, as much debug and trace support as possible would have been removed in favor of quicker executing code, and a high level of code optimization would have been applied.  That is the nature of a DLL; it should be well debugged first, then compiled to execute as fast as possible.  The resulting code could prove very difficult to decompile intelligibly.
</opinion>
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ldvhaiAuthor Commented:
Thank you for all the help!

Sincerely.
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