程式碼提供在下方，照片為會跳出的錯誤，但是我確定list內有7個值(遊戲程式碼太長，就不提供了)，卻一直跳出錯誤訊息，有人能幫助我解答嗎?謝謝!

using System.Data;
using System.Data.OleDb;

List<int> yourLotto = new List<int>();

private void Insert_to_access()
        {
            //第一步：設定連線字串
            String strConnectionString = "Provider=Microsoft.ACE.OLEDB.12.0; Data Source=Database2.mdb";
            //第二步：建立資料庫連線物件
            OleDbConnection cn = new OleDbConnection();
            cn.ConnectionString = strConnectionString;
            //第三步：開啟資料庫連線
            cn.Open();
            //SQL
            String SqlStr = "";
            SqlStr = " INSERT INTO LOTTO([ball1], [ball2], [ball3], [ball4], [ball5], [ball6], [ball7])values(";
            //SqlStr &= "'" & Date.Now.ToShortDateString & "' ,"
            for (int z = 0; z <= 5; z++)
            {
                SqlStr += "'" + yourLotto[z] + "',";
            }
            SqlStr += "'" + yourLotto[6] + "' )";

            //建立Command物件
            OleDbCommand command_ = new OleDbCommand(SqlStr, cn);
            //執行SQL語法
            command_.ExecuteNonQuery();
                //關閉資料庫連線
            cn.Close();
        }

這是access 的 table