asp.net动态添加TextBox控件并获取这些动态添加的TextBox的Text属性
如题所示，能在服务器端实现吗？
[解决办法]
protected void Page_Load(object sender, EventArgs e)
{
TextBox txtbx= null;
DropDownList ddl = null;

for (int i = 0; i < 4; i++)
{
txtbx= new TextBox();
txtbx.ID = "mytxt" + i;
txtbx.Text = "mytxt" + i;

pnlButton.Controls.Add(txtbx);

ddl= new DropDownList();
ddl.ID = "mydropdown " + j;
ddl.Text = "mydropdown " + j;
ddl.Items.Add("Hii");
ddl.Items.Add("Hello");
ddl.AutoPostBack = true;
ddl.SelectedIndexChanged += new EventHandler(ddl_Click);

pnlButton.Controls.Add(ddl);

Literal lit = new Literal();
lit.Text = "</br></br>";
pnlButton.Controls.Add(lit);
}

}
[解决办法]
参考下面四篇，如果还不会，再继续讨论：
http://www.cnblogs.com/insus/archive/2012/09/24/2700658.html
http://www.cnblogs.com/insus/archive/2012/09/23/2698613.html
http://www.cnblogs.com/insus/p/3148345.html
http://www.cnblogs.com/insus/archive/2011/12/01/2270455.html
[解决办法]

using System;
using System.Collections.Generic;
using System.Web.UI.WebControls;

public partial class _Default : System.Web.UI.Page {
    protected Button btnCreate = new Button();
    protected Button btnRead = new Button();
    protected Label lblMessage = new Label();

    protected List<string> ControlsId {
        get {
            if (ViewState["ControlsId"] == null) {
                ViewState["ControlsId"] = new List<string>();
                }
            return (List<string>)ViewState["ControlsId"];
            }
        set { this.ViewState["ControlsId"] = value; }
        }

    protected override void OnLoad(EventArgs e) {
        base.OnLoad(e);

        btnCreate.Text = "在运行时刻添加一个按钮";
        btnCreate.Click += btnCreate_Click;
        this.form1.Controls.Add(btnCreate);
        this.form1.Controls.Add(lblMessage);
        btnRead.Text = "读取文本";
        btnRead.Click += btnRead_Click;
        this.form1.Controls.Add(btnRead);
        
        foreach (string _id in ControlsId) {
            TextBox _ctl = new TextBox(); 
 
            _ctl.ID = _id;
            this.form1.Controls.Add(_ctl);
            }
        }

    void btnCreate_Click(object sender, EventArgs e) {
        string _id = Guid.NewGuid().ToString();
        ControlsId.Add(_id);
        TextBox _ctl = new TextBox();
        _ctl.ID = _id;
        this.form1.Controls.Add(_ctl);
        }

    void btnRead_Click(object sender, EventArgs e) {
        lblMessage.Text = "";
        foreach (string _id in ControlsId) {
            lblMessage.Text += ((TextBox)this.FindControl(_id)).Text;
            }
        }
    
    }