动态创建控件后如何取值

Question

代码如下：using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;

public partial class _Default : System.Web.UI.Page
{

protected void btnSubmit_Click(object sender, EventArgs e)
{

SqlConnection conn = DB.createcon();
conn.Open();
string cmdText = "insert into [Items] (Item_Content,Item_IsRadio,Theme_Id) values (@content,'" + this.rbtnl.Text + "','"+this.ddlTheme.SelectedValue+"') SELECT @@IDENTITY AS 'Id'";
SqlCommand mycmd = new SqlCommand(cmdText, conn);
SqlParameter paraCon = new SqlParameter("@content",SqlDbType.VarChar,1000);
paraCon.Value = this.txtContent.Text;
mycmd.Parameters.Add(paraCon);
int Id=Convert.ToInt32(mycmd.ExecuteScalar());
int Num = Convert.ToInt32(this.txtNum.Text);
for (int i = 1; i <= Num; i++)
{
string cmdChoAddtext = "insert into [Choice] (Cho_Content,Item_Id) values(@content,'"+Id+"')";
SqlCommand cmdChoAdd = new SqlCommand(cmdChoAddtext, conn);
SqlParameter paraCho = new SqlParameter("@content", SqlDbType.VarChar, 100);
paraCho.Value=((TextBox) this.Panel1.FindControl("txtCho"+i.ToString())).Text;//此处报错为为将对象实例化，也就是说没找到该控件
cmdChoAdd.Parameters.Add(paraCho);
cmdChoAdd.ExecuteNonQuery();
}
conn.Close();
}

protected void Page_Load(object sender, EventArgs e)
{

}

protected void btnCre_Click(object sender, EventArgs e)//单击这个按钮我创建出Num个TextBox
{
int Num = Convert.ToInt32(this.txtNum.Text);
for (int i = 1; i <= Num; i++)
{
TextBox txtCho = new TextBox();
this.Panel1.Controls.Add(txtCho);
txtCho.ID = "txtCho" + i.ToString();
Response.Write(txtCho.ID);

}

}
}
现在问题就是在我btnCre_Click动态创建TextBox之后，当单击btnSubmit_Click中想取出动态创建的控件中的值插入数据库，我该怎么找到该控件，然后再取出该值呢？？？谢谢大家了！！！急！

Answer 1

form的method为post时或没有设置时用Request.Form["控件ID"]就是了
form的method为get时用Request.QueryString["控件ID"]

Answer 2

取出txtCho 得ClientID然后存放起来
这个ID在Request里边有对应得值
Response[ClientID]就可以获得

ClientID你可以把这个存放在ViewStatus里边然后下去点按钮可以拿到ClientID

Answer 3

问题解决！！
有点麻烦，不知道你还需要不
你问的这个问题还真有点不好搞
上代码：
//声明静态List<TextBox>对象的array
private static System.Collections.Generic.List<TextBox> array = new System.Collections.Generic.List<TextBox>();
protected void Page_Load(object sender, EventArgs e)
{
//如果页面回调
if (IsPostBack)
{
if (array.Count > 0)//如果array包含有值
foreach (TextBox tb in array)
Panel1.Controls.Add(tb);//在Panel1上加上TextBox的对象
}
else//页面第一次加载先清一下array
{
array.Clear();
}
}
protected void Button1_Click(object sender, EventArgs e)
{
array.Clear();//清空
Panel1.Controls.Clear();//panel也要清
for (int i = 0; i < 10; i++)
{
TextBox tb = new TextBox();
tb.ID = "TextBox" + i.ToString();
array.Add(tb);
Panel1.Controls.Add(tb);
}
}
protected void Button2_Click(object sender, EventArgs e)
{
for (int i = 0; i < 10; i++)
{
TextBox tb = Panel1.FindControl("TextBox" + i.ToString()) as TextBox;
if (tb != null)
{
Response.Write(tb.Text);
}
}
}