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Compiler Error CS0163

Control cannot fall through from one case label ('label') to another

When a switch statement contains more than one switch section, you must explicitly terminate each section, including the last one, by using one of the following keywords:

If you want to implement "fall through" behavior from one section to the next, use goto case #. For more information and examples, see switch (C# Reference).

The following sample generates CS0163.

// CS0163.cs
public class MyClass
{
    public static void Main()
    {
        int i = 0;

        switch (i)   // CS0163
        {
            // Compiler error CS0163 is reported on the following line.
            case 1:
                i++;
            // To resolve the error, uncomment one of the following example statements.
            // return;
            // break;
            // goto case 3;

            case 2:
                i++;
                return;

            case 3:
                i = 0;
                return;

            // Compiler error CS0163 is reported on the following line.
            default:
                Console.WriteLine("Default");
                // To resolve the error, uncomment the following line:
            //break;
        }
    }
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