C# supports two special keywords: const and readonly.
both of them try to prevent the modification of a field.
We can declare constants like a variable.
const values cannot be changed after the declaration.
We can assign a value to a readonly field during the declaration or through a constructor.
To declare a constant variable, prefix the keyword const before the declaration.
constants are implicitly static.
readonly values can be both static and non-static; whereas constants are always static.
using System; class Program//from w ww. j a v a2s. c o m { static void Main(string[] args) { const int MYCONST = 100; //Following line will raise error //MYCONST=90;//error Console.WriteLine("MYCONST={0}", MYCONST); } }
for readonly, we will get errors for these lines:
public readonly int myReadOnlyValue=105; //Following line will raise error myReadOnlyValue=110;//error