how to add web page in windows forms project

You can't "add a web page" to a windows forms project - web pages needs IIS or similar to support them. However, you can open a web page within your application, or via the user browser.
To open it in your app, you need a form with a WebBrowser[^] control on it - you then use the link to pass the URL to the control, and it displays the web page. Just handle the LinkClicked event and:

private void myLinkLabel_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)
    {
    myWebBrowser.Navigate("www.CodeProject.com");
    }

To open it via the user browser is just as easy: handle the LinkClicked event for the LinkLabel and use:

System.Diagnostics.Process.Start("http://www.CodeProject.com");

Right Click on project > Add New Item > WebForm1.aspx
now on link button click,

Reponse.Redirect("WEbForm1.aspx");

-KR