Delegates and Multicast Delegates

Delegates is a type which hold the reference of a method in an object.
Mutlicast delegate is a type which hold the reference of multiple methods in an object. In order to work with Mutlicast delegates, the method should return void, otherwise run-time error will throw.

Below is the code snippet of a CodeBehind aspx page, simply copy-paste this in code behind (below the namespace) and run.

public partial class _Default : System.Web.UI.Page
{
    delegate int CalculateDelegate(int a, int b);
    delegate void MutliCastDelegate(int a, int b); 

    protected void Page_Load(object sender, EventArgs e)
    {
        Response.Write("Delegates: ");
        CalculateDelegate cDelegate = new CalculateDelegate(Add); 

        // call delegate
        Response.Write(cDelegate(6, 9000).ToString()); 
        Response.Write("<hr />");

        Response.Write("Mutlicast Delegates: ");
        MutliCastDelegate multi = new MutliCastDelegate(AddM);
        multi += new MutliCastDelegate(Subtract); 
        
        // call multicast delegate
        multi(50, 98999); 
        Response.Write("<hr />");
    }

    public void AddM(int a, int b)
    {
        Response.Write("Method 1: " + (a + b));
    }

    public void Subtract(int a, int b)
    {
        Response.Write("Method 2: " + (a - b));
    }

    private int Add(int a, int b)
    {
        return a + b;
    }
}

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