事件处理程序不能处理由For循环创建的按钮

Question

我创建了文本框和两个按钮（编辑，删除）。我为每个按钮添加了一些代码来添加eventhandler。

for (int oo = 0; oo < mav.GetCategoriesSalary2(Emplvl.SelectedValue.ToString()).Rows.Count; oo++)
     {
         TextBox tb1 = new TextBox();
         tb1.ID = "textcat" + oo;
         tb1.Text = mav.GetCategoriesSalary2(Emplvl.SelectedValue.ToString()).Rows[oo][0].ToString();
         tb1.Width = 100;
         catresult.Controls.Add(tb1);

         Button newButton = new Button();
         newButton.ID = "btncatEdit" + oo;
         String aa = newButton.ID;
         newButton.Text = "Edit";
         catresult.Controls.Add(newButton);


         Button newButton1 = new Button();
         newButton1.ID = "btncatDelete" + oo;
         newButton1.Text = "Delete";
         catresult.Controls.Add(newButton1);
         newButton1.Click += new EventHandler(newButton1_Click);
    }

这是事件。

void newButton1_Click(object sender, EventArgs e)
{
    ClientScript.RegisterStartupScript(this.GetType(), "yourMessage", "alert('" + Emplvl.SelectedValue.ToString() + "');", true);
}

我跑了。当我单击按钮时事件不起作用它只是隐藏在for循环中创建的所有文本框和按钮。我的代码出了什么问题？