I have written a code to be used as a appian plugin using C#.
Does Appian supports C# language ?
If yes, how can I deploy the code written using C# ?
Or do I need to convert the C# code to Java code ?
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Appian is written in Java. Simplest thing is to convert to Java code.
The other thing you could possibly do is write your C# on the web with an API that Appian could then consume. Appian could use THAT C#.