i want to protect my application for decompiling. does a free packer exists or some cheap packer
This is the wrong section, but I will answer you anyways. ConfuserEx is pretty much the best and free .NET code obfuscation tool. The modified versions of it are even better. Here is the download:
https://github.com/yck1509/ConfuserEx/releases
https://github.com/yck1509/ConfuserEx/releases
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