namespace _11 
    { 
    public partial class Form1 : Form 
        { 
         Config config;//加这一句
        public Form1() 
            { 
            InitializeComponent(); 
            } 
        
        private void button1_Click(object sender, EventArgs e) 
            { 
            //Config config = new Config(this .dataGridView1 ); //这一句不要了
             DataTable dt = config.DT; 
             
             DataRow xinhang = dt.NewRow();  //这是要增加的行 
             xinhang["姓名"] = "陈中";  //到这里就通不过了. 
             xinhang["性别"] = "男"; 
             dt.Rows.Add(xinhang); 
              

            } 

        private void Form1_Load(object sender, EventArgs e) 
            { 
            config = new Config(this.dataGridView1); //前面的声明去掉
           config . LoadFromFile(); 
            } 
        } 
    }