namespace ReadSPListData
{
    class ProductInfo
    {
        public string productName { get; set; }
        public string productSKU { get; set; }
        public string productPrice { get; set; }
    }
}

        private void btnExit_Click(object sender, EventArgs e)
        {
            Application.Exit();
        }

首先要加入合适的引用。右击项目。加入引用Microsoft.SharePoint.Client.dll和Microsoft.SharePoint.Client.Runtime.dll。并在代码中加入using。