Differences between 'const' and 'read-only' in C#

Const	Read-Only
Can't be static. Value is evaluated at compile time Initialized at declaration only	Can be either instance-level or static. Value is evaluated at run time. Can be initialized in declaration or by code in the constructor.

Example on Const and Read-Only

public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
class constvalue
{
public const int conval = 10; //constant initialization
public readonly int tempvalue = conval; //read-only initialization
public constvalue(int rvalue)
{
tempvalue = tempvalue + rvalue; //read-only initialization in constructor
MessageBox.Show(tempvalue.ToString());
}
}

private void button1_Click(object sender, EventArgs e)
{
constvalue objconstvalue = new constvalue(100);
}

}