Changing a string literal (connection string) in a program without being able to access the original source

I need to change the connection string that is hard-coded in a single class for a program I created. I no longer have the original source code for the program in question, but I have decompiled it and have access to that.

I've tried re-compiling the decompiled source, but run into issues with the decompiled code being slightly different and requiring numerous changes. I've also tried recre开发者_C百科ating the class as a DLL without success. I think either of these approaches could work, but there is something I'm missing. Can anyone point me in the right direction, or suggest something simpler that I'm not thinking of?

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If your corrected connection string is the same size or shorter than the old one, you should be able to edit the bytecode directly in a hex editor and overwrite the string with your new one. Just remember to change the string length and add 00 00 at the end:

In the .NET CLR, strings are laid out in memory pretty much the same way that BSTRs were implemented in OLE Automation: as a word-aligned memory buffer consisting of a four-byte integer giving the length of the string, followed by the characters of the string in two-byte chunks of UTF-16 data, followed by two zero bytes.