For compiling unsafe code, you have to specify the /unsafe command-line switch with command-line compiler.
For example, to compile a program named one.cs containing unsafe code, from command line, give the command −
csc /unsafe one.cs
Under Visual Studio IDE, enable use of unsafe code in the project properties. The following are the steps −
- Open Project properties by double clicking the properties node in the Solution Explorer.
- Click on the “Build” tab.
- Select the option "Allow unsafe code".