There are times, where we need to create an application page to be accessed anonymously by the user, instead of the user signing-in and accessing the page. Here is the code-snippet to create an unsecure application page for sharepoint.

    public partial class UnsecureApplicationPage : Microsoft.SharePoint.WebControls.UnsecuredLayoutsPageBase
    // inherit the page from Microsoft.SharePoint.WebControls.UnsecuredLayoutsPageBase instead of Microsoft.SharePoint.WebControls.LayoutsPageBase    

    {

        protected void Page_Load(object sender, EventArgs e)
        {                   

        }       

    //override the allow anonymous property to true
        protected override bool AllowAnonymousAccess
        {
            get { return true; }
        }

        protected override bool AllowNullWeb { get { return true; } }

        protected override void OnPreInit(EventArgs e)
        {

            SPSecurity.RunWithElevatedPrivileges(delegate()
            {

                base.OnPreInit(e);
                Microsoft.SharePoint.SPWeb _Web = SPControl.GetContextWeb(Context);
                this.MasterPageFile = _Web.MasterUrl;
            });

        }

    }

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Creating an application page for sharepoint is fairly simple and straight-forward. To make that application page secure, just do some extra steps in the code. Here is the code-snippet for creating secure application page in sharepoint .

public partial class SampleSecurePage : Microsoft.SharePoint.WebControls.LayoutsPageBase    

    {

        public SampleSecurePage()
        {
           //In the constructor define rights check mode to be done on the pre-init event  
            this.RightsCheckMode = RightsCheckModes.OnPreInit;

        }

        //get the permission set from spbase permission enumeration
        protected override SPBasePermissions RightsRequired
        {
        get
        {
        SPBasePermissions permissions = base.RightsRequired;
        return permissions;
        }
        }

        protected override void OnPreInit(EventArgs e)
        {

                 base.OnPreInit(e);
                 Microsoft.SharePoint.SPWeb _Web = SPControl.GetContextWeb(Context);

        //dynamically assign the master of the current spweb to the application page
                 this.MasterPageFile = _Web.MasterUrl;

             if (!HttpContext.Current.User.Identity.IsAuthenticated)
                {
                    //re-direct the user to log-in page and authenticate

                }                  

        }       

        protected void Page_Load(object sender, EventArgs e)
        {
            //do some logic here             

        }        

    }

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Many a times, we’d find the need for leveraging the javascript in sharepoint web parts. It could be a simple requirement of opening up a pop-up window or could be  a complex requirement to invoke a web service from javascript. Here is code-snippet and steps to leverage java script inside sharepoint web parts. The crux is to embeed or register the javascript function in the PreRender event of the web part and invoke this registered javascript, from wherever desired.

//In the constructor of the web part, define a delegate of the PreRender method.
    public SampleWebPart()
        {
            this.PreRender += new EventHandler(SampleWebPart_ClientScript_PreRender);

        }

        #region register javascript methods

//In the delegate method of PreRender, call the another method that does the registering of javascript
        // Client script registration event
        private void SampleWebPart_ClientScript_PreRender(object sender, System.EventArgs e)
        {
            RegisterJavaScript();
        }

//Use the RegisterClientScriptBlock method of the Page object, to register the javascript
        //Function will embedded script
        protected void RegisterJavasScript()
        {

            //format the string to hold the javascript
            string embeedscript = "   <script>" +
                                    "function openNewWin(url) {" +
                                        //"var x = window.open(url, 'mynewwin', 'width=1200,height=800');" +
                                        "var x = window.open(url);" +
                                        "x.focus();" +
                                            "} " +
                                   "</script>";

            string OpenScriptKey = "OpenNewWin";

            //check whether the javascript has been already registered to the page
            if (!Page.IsClientScriptBlockRegistered(OpenScriptKey))
            {
                Page.RegisterClientScriptBlock(OpenScriptKey, embeedscript);

            }

        }

protected void Button1_click(object sender, ImageClickEventArgs e)

        {

//invoke the javascript function that opens the application page  in new window
                this.Page.ClientScript.RegisterStartupScript(this.GetType(), "OpenWin", "<script>openNewWin('" + url + "')</script>");                

}

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