Compiling .NET code with Mono compiler is almost similar to compile with g++/gcc. The basic steps are as follows.
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1. Download and install the Mono for your platform from http://www.go-mono.com/mono-downloads/download.html\\
2. Then write the code (we are going to see how to use c# compiler) with your favorite editor or IDE.\\
3. Now to compile the code, we simply need to execute a file called mcs under the <installed location of mono>/bin, like this\\

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mcs <filename>.cs -out:<filename>.exe

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1. This will compile .cs file specified and produces the executable <filename>.exe\\

\\ But this compilation would produce only console application. That is whenever you execute the application, a terminal or a command window will be opened automatically. We may need to specify one or two options to ask the compiler to compile in forms mode.
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mcs <filename>.cs -out:<filename>.exe -target:winexe -r:System.Windows.Forms.dll -r:System.Drawing.dll

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The additional options used in this case are, -target and -r. -target specifies compiler that it has to generate a winexe type of application rather than console. -r option refers to the references. System.Windows.Forms.dll and System.Drawing.dll are the most common references needed when we start building applications with GUI support.
\\ NOTE: We can even build GUI applications in console mode, but the console/terminal window will show up and will not be closed until the application is running.