What's wrong with this?

public partial class crlRoles : System.Web.UI.UserControl
{
    private DataSet dsRoles = null;
    private DataAccess DataLayer = null;

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            dsRoles = new DataSet();
            DataLayer = new DataAccess();
            DataLayer.ConnectionString = ConfigurationManager.ConnectionStrings["ConnString"].ConnectionString;

            _LoadList();
        }
    }

    private void _LoadList()
    {

        dsRoles = DataLayer.ExecuteQuery("as_GetRole", CommandType.StoredProcedure);

        lstRoles.DataSource = dsRoles.Tables[0];
        lstRoles.DataMember = "RoleName";
    }
}

I have tried moving the instantiations into _LoadList, and it still fails. DataLayer is an object. dsRoles is null. When I run the
ExecuteQuery line it errors.