找不到类型或命名空间“系统”。 您是否缺少程序集参考？

Question

I am compiling my first "Hello World" program of C# in mono compiler persist error

The type or namespace 'system' could not be found. Are you missing an assembly reference?

I googled it and it says I need to add reference and it isn't available for mono compiler. I don't know where and what to add. Kindly guide me.

Answer 1

The error message you've posted indicates that you are attempting to reference something in a namespace called system (note: lowercase).

C# namespaces are case-sensitive. The namespace System needs to be capitalized when you reference it, either in a using statement as in:

using System;

or in a fully-qualified reference like this:

System.Console.WriteLine("Hello, World!");