Example of delegate

A delegate is a reference type variable that holds the reference to one or multiple method(s). The reference can be changed at runtime.

public delegate int mdel(int a, int b);
    protected void Page_Load(object sender, EventArgs e)
    {
        mdel del = add;
        del += sub;
        del += mul;
        del -= add;
        Response.Write(del(20,10).ToString());
    }
    public int add(int m, int n)
    {
        return m + n;
    }
    public int sub(int m, int n)
    {
        return m - n;
    }
    public int mul(int m, int n)
    {
        return m * n;
    }