Retrieving values from Contact table

Content

Hai,

I am trying to fetch the name of the contact from Contacts table. For that I created a button and on button click i wrote the fetch queries. I used RNObject for retrieving data. While I run the below mentioned code it throws an exception. The exception was " Object reference not set to an instance of an object"

Can anybody tell what wrong with my code. Please give me an answer. 

I wrote the code in Visual studio 2012/ C# project.

Code Snippet

             public void _usrCtrl_btnClicked()
        {
            ClientInfoHeader clientInfoHeader = new ClientInfoHeader();
            clientInfoHeader.AppID = "Retrieve Data";
            //String queryString = "SELECT Contact FROM Contact LIMIT 1";
            Contact contactTemplate = new Contact();