i am getting error as nullReferenceException

Question

i am getting error as Object reference not set to an instance of an object.
NullReferenceException was unhandled by user..


public partial class _Default : System.Web.UI.Page

{

    SqlConnection MyConnection = new SqlConnection(ConfigurationManager.AppSettings["ConnectionString"].ToString());

    SqlCommand MyCommand= new SqlCommand();

    string query;

    protected void Page_Load(object sender, EventArgs e)

    {

    }

    protected void submit_Click(object sender, EventArgs e)

    {

        query="INSERT INTO tablem (name,password) VALUES (" + name +"," + password +")";

        try

        {

        }

        catch (NullReferenceException)

        {

            Console.WriteLine("error ");

        }

    }  

}