C＃“ Web”不包含“ GetList”错误的定义

Question

我想从共享点URL中获取数据，我将所有splist都移至treeview。最后，当我单击treeview并收到此错误时，我想从此splist获取数据。 “ Web”不包含“ GetList”的定义，找不到可以接受类型为“ Web”的第一个参数的扩展方法“ GetList”（是否缺少using指令或程序集引用？）

我该如何解决这个问题？

我的代码；

private void Form_Load(object sender, EventArgs e)
    {
        using (ClientContext spContext = new ClientContext(@"http://mysite/username/"))
        {
            Web spWeb = spContext.Web;
            ListCollection spLists = spContext.Web.Lists;
            spContext.Load(spLists);
            spContext.ExecuteQuery();

            List<Items> spListNames = new List<Items>();

            foreach(List listItem in spLists)
            {
                spListNames.Add(new Items {Title=listItem.Title }); ;
            }

            treeList1.DataSource = spListNames;
        }
    }




    private void treeList1_Click(object sender, EventArgs e)
    {
        var Title = treeList1.FocusedNode[treeList1.Columns[0]].ToString();

        BindGridFromSharePoint(Title);
    }

    private void BindGridFromSharePoint(string Title)
    {
        using (ClientContext spContext = new ClientContext(@"http://mysite/username/"))
        {
            Web spWeb = spContext.Web;


            CamlQuery camlQuery = new CamlQuery();
            camlQuery.ViewXml = "<View/>";

            List spLists = spContext.Web.GetList(@"http://mysite/username/" + Title.Replace(" ", " %20"));
            var spSelectedListItems = spLists.GetItems(camlQuery);
            spContext.Load(spLists);
            spContext.Load(spSelectedListItems);

            spContext.ExecuteQuery();

            DataTable dt = new DataTable();
            foreach (var item in spSelectedListItems)
            {
                try
                {
                    foreach (var item1 in item.FieldValues)
                    {
                        dt.Columns.Add(item1.Key, typeof(string));

                    }
                }
                catch (Exception)
                {

                    // throw;
                }
                DataRow dr1 = dt.NewRow();
                foreach (var item1 in item.FieldValues)
                {
                    dr1[item1.Key] = item1.Value;
                }
                dt.Rows.Add(dr1.ItemArray);
            }
            gridControl1.DataSource = dt;

        }
    }

    public class Items
    {
        public string Title { get; set; }
    }