Monday, 18 November 2013

C# :Passing Parameters by Reference Or How to use “ref” Keyword in C#.

Hi friends,in this article I will explain about C# Passing Parameters by Reference Or How to use “ref” Keyword in C#.
In Previous articles I explained about ASP.NET MVC Tutorial or Intro to ASP.NET MVC 4 or what is MVC (Model – View – Controller),Detecting sequence of at least n sequential/Consecutive Dates from a given List in ASP.NET using C# or VB.NET and CSS - Gmail-style progress bar when page is loading

A reference parameter is a reference to a memory location of a variable. When you pass parameters by reference, unlike value parameters, a new storage location is not created for these parameters. The reference parameters represent the same memory location as the actual parameters that are supplied to the method.
In C#.Net:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        int y = 1;
        ex(y);
        Response.Write(y + "<br/>");
        int y2 = 2;
        ex2(ref y2);
        Response.Write(y2);
    }
    protected void ex(int x)
    {
        x = 10;
    }
    protected void ex2(ref int x)
    {
        x = 10;
    }
}


The output of the above code as shown in the below figure.

10
The output of y after calling a method will be 1 because changes in the called method does not affect there.But the output y2 after calling a method will be 10 because changes in the called method does effect there.




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