Because the code has been obfuscated, it's a way of making the code so hard to understand that it deters reverse engineering.
Usually PreEmptive's Obfuscation tool comes in Visual Studio, check it out. You could also try Market Place, Nuget & Visual Studio Gallery for more.
If you wish to de-obfuscate the DLL it might be possible with an old copy of the code and refactoring based on that. Otherwise you will find that Obfuscation is typically one way, eg renaming a btnSave
to a1
is irreversible.
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