How do I convert a dictionary/List to a JSON String in C#?

using System.Web.Script.Serialization;

 Dictionary<string, string> name = new Dictionary<string, string>();
        name.Add("1", "GKSamy");
        name.Add("2", "Rakshitta");
        string myJsonString = (new JavaScriptSerializer()).Serialize(name);

How can I block F12 keyboard key, CTRL+SHIFT+i and Prevent from Right Click

<script src="http://code.jquery.com/jquery-1.9.1.js" type="text/javascript"></script>
    <script language="JavaScript">

        //////////F12 disable code////////////////////////
        document.onkeypress = function (event) {
            event = (event || window.event);
            if (event.keyCode == 123) {
                //alert('No F-12');
                return false;
            }
            else if (event.ctrlKey && event.shiftKey && event.keyCode == 73) {
                return false;  //Prevent from ctrl+shift+i
            }

        }
        document.onmousedown = function (event) {
            event = (event || window.event);
            if (event.keyCode == 123) {
                //alert('No F-keys');
                return false;
            }
            else if (event.ctrlKey && event.shiftKey && event.keyCode == 73) {
                return false;  //Prevent from ctrl+shift+i
            }
        }
        document.onkeydown = function (event) {
            event = (event || window.event);
            if (event.keyCode == 123) {
                //alert('No F-keys');
                return false;
            }
            else if (event.ctrlKey && event.shiftKey && event.keyCode == 73) {
                return false;  //Prevent from ctrl+shift+i
            }
        }

     ////////////////////Prevent from Right Click Inspect Element /////////////////////////////
        $(document).on("contextmenu", function (e) {
            e.preventDefault();
            alert('Right Click is not allowed');
        });
        /////////////////////end///////////////////////
    </script>