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Compiler Error CS0822

Visual Studio 2008

Implicitly typed locals cannot be const

Implicitly typed local variables are only necessary for storing anonymous types. In all other cases they are just a convenience. If the value of the variable never changes, just give it an explicit type. Attempting to use the readonly modifier with an implicitly typed local will generate CS0106.

To correct this error

  • If you require the variable to be constant or readonly, give it an explicit type.

The following code generates CS0822:

// cs0822.cs
class A

    public static int Main()
        const var x = 0; // CS0822.cs
        return -1;
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