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Compiler Error CS0463

Evaluation of the decimal constant expression failed with error: 'error'

This errors occurs when a constant decimal expression overflows at compile time.

Typically you get overflow errors at run time. In this case, you defined the constant expression in such a way that the compiler could evaluate the result and know that an overflow would happen.

The following code generates error CS0463.

// CS0463.cs 
using System; 
class MyClass 
    public static void Main()    
        const decimal myDec = 79000000000000000000000000000.0m + 79000000000000000000000000000.0m; // CS0463