打开模式，表格中有按钮

Question

我在cs文件中创建了一个按钮，其代码如下所示，并尝试触发表格内按钮的事件处理程序。但是，它不起作用。我可以知道该怎么办？

protected void feesinfo_Click(object sender, EventArgs e)
{
    //Hidden field for checking in .aspx file
    ClientScript.RegisterHiddenField("typeButton", "FEE_INFO");
    System.Diagnostics.Debug.WriteLine("School Fees Details");
    Table tbl = new Table();

    for (int i = 0; i < 5; i++)
    {

        TableRow tRow = new TableRow();


        Table1.Rows.Add(tRow);

        for (int j = 1; j <= 6; j++)
        {
            TableCell tCell = new TableCell();


            if (j == 4)
            {

                Button btn = new Button();
                btn.CssClass = "btn btn-success";
                btn.ID = "btndetails";
                btn.Text = "400";
                tCell.Controls.Add(btn);
                btn.Click += new EventHandler(btnClick);

            }
            else
            {
                tCell.Text = "Row " + i + ", Cell " + j;
            }

            tRow.Cells.Add(tCell);

        }

    }
}

protected void btnClick(object sender, EventArgs e)
{
    ClientScript.RegisterHiddenField("typeButton", "Details");
    System.Diagnostics.Debug.WriteLine("School Fees Details");

    mpe.Show();
}