Readonly prevents a field to be changed.
When a field declaration includes a readonly modifier, assignments to the field introduced by the declaration can only occur as part of the declaration or in a constructor in the same class.
Readonly fields can be initialized at runtime, unlike const.
Example 1:
public readonly int x = 10;
Example 2:
public partial class Form1 : Form
{
public class Stack
{
readonly int m_Size;
public Stack()
: this(20)
{ }
public Stack(int size)
{
m_Size = size;
}
}
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
Stack st = new Stack();
}
}
