get changed values of dynamic control on webform

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C#3.5

I'm changing the values of dynamic controls, but not able to get those values after static button click event

I'm binding dynamic controls on page load here it is

page load()
{
   int id = 1;
                    //get field names
                    cmd = new SqlCommand("GetDynamicFields", con);
                    con.Open();
                    cmd.CommandType = CommandType.StoredProcedure;
                    cmd.Parameters.Add("@DeviationID", SqlDbType.Int);
                    cmd.Parameters["@DeviationID"].Value = id;
                    SqlDataAdapter da = new SqlDataAdapter(cmd);
                    da.Fill(ds);
                    dt = ds.Tables[0];
                    //get field values
                    cmd = new SqlCommand("GetDatafromXML", con);

                    cmd.CommandType = CommandType.StoredProcedure;
                    //xml
                    XmlReader reader = cmd.ExecuteXmlReader();
                    con.Close();

                    XmlDocument doc = new XmlDocument();
                    doc.Load(reader);
                    XmlElement rootElem = doc.DocumentElement;
                    if (dt.Rows.Count > 0)
                    {
                        for (int i = 0; i < rootElem.ChildNodes.Count; i++)
                        {
                            string typedata = dt.Rows[i][1].ToString();
                            switch (typedata)
                            {
                                case "int":
                                case "string":
                                    TextBox tx1 = new TextBox();
                                    tx1.ID = dt.Rows[i][0].ToString();
                                       tx1.Text = rootElem.ChildNodes[i].InnerText;
                                    td.Controls.Add(tx1);
                                    tr.Controls.Add(td);
                                    dynamictable.Controls.Add(tr);
                                    Cache["tt"] = tr;
                                    break;
                                case "combo":

                                    string hh = rootElem.ChildNodes[i].InnerText;
                                    Ddl.Items.Add(hh);
                                    td.Controls.Add(Ddl);
                                    tr.Controls.Add(td);
                                    dynamictable.Controls.Add(tr);
                                    Cache["tt"] = tr;
                                    break;
                            }
                        }
                    }
}

And I tried using cache to get changed values of dynamic controls but it showing me previous values.because its in page load event i hope.

So how do i get the change values of dynamic controls.