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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.
public static void Main()
const decimal myDec = 79000000000000000000000000000.0m + 79000000000000000000000000000.0m; // CS0463