protected void button_Click(object sender, EventArgs e)
    {
        foreach (RepeaterItem rpi in Repeater1.Items)
        {
            TextBox texQuantity = rpi.FindControl("TextBox1") as TextBox;
            Button texWareId = rpi.FindControl("Button1") as Button;
            if (texQuantity != null)
            {
                int quan = Convert.ToInt32(texQuantity.Text);
                int wid = Convert.ToInt32(texWareId.CommandArgument);

                CartTableAdapters.DisplayCartTableAdapter upnumber = new CartTableAdapters.DisplayCartTableAdapter();
                upnumber.UpdateCartWareNumber(quan,CartId,wid);
            }
        }

    }

static void Main()
    {
        string str = null;
        int i;
        bool bl = int.TryParse(str, out i);
        Console.WriteLine(i);//0
        str = "10";
        bl = int.TryParse(str, out i);
        Console.WriteLine(i);
        bl = int.TryParse(str, out i);--out签名的参数不是说只能为null吗???为什么这段程序仍然可以编译,并且测试成功.....
        Console.WriteLine(i);
        Console.ReadKey();

    }