Answer Posted / sandya

Constant fields or local variables must be assigned a value at the time of declaration and after that they cannot be modified. By default constant are static, hence you cannot define a constant type as static.
A const field is a compile-time constant. A constant field or local variable can be initialized with a constant expression which must be fully evaluated at compile time.
public const int X = 10;
A readonly field can be initialized either at the time of declaration or with in the constructor of same class. Therefore, readonly fields can be used for run-time constants.

class MyClass
{
readonly int X = 10; // initialized at the time of declaration
readonly int X1;
}

public MyClass(int x1)
{
X1 = x1; // initialized at run time
}
}

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