Compiler Error CS0150

A constant value is expected

A variable was found where a constant was expected. For more information, see switch (C# Reference).

The following sample generates CS0150:

// CS0150.cs
namespace MyNamespace
{
   public class MyClass
   {
      public static void Main()
      {
         int i = 0;
         int j = 0;

         switch(i)
         {
            case j:   // CS0150, j is a variable int, not a constant int
            // try the following line instead
            // case 1:
         }
      }
   }
}

This error is also produced when an array size is specified with a variable value and initialized with an array initializer. To remove the error, initialize the array in a separate statement or statements.

// CS0150.cs
    namespace MyNamespace
    {
        public class MyClass
        {
            public static void Main()
            {
                int size = 2;
                double[] nums = new double[size] { 46.9, 89.4 }; //CS0150
                // Try the following lines instead
                // double[] nums = new double[size];
                // nums[0] = 46.9; 
                // nums[1] = 89.4;
            }
        }

    }