does not support System.UI namespace in C#?
AmirBayramaliev (0)

Error message from compiler:

Mono C# compiler version
 mcs -out:main.exe main.cs
main.cs(2,14): error CS0234: The type or namespace name UI' does not exist in the namespaceSystem'. Are you missing an assembly reference?
main.cs(4,13): error CS0246: The type or namespace name TextWriter' could not be found. Are you missingSystem.IO' using directive?

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SixBeeps (2872)

@AmirBayramaliev TextWriter uses System.IO, not System.UI