Not Find the control to show the value in textbox in c#

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using Gutil;

public partial class dynamicform1 : System.Web.UI.Page

{

string strValue = string.Empty;

protected void Page_Load(object sender, EventArgs e)

{

if (!IsPostBack)

{

// CreateTextBoxes();

//ViewState["count"] = 1;

}

btnSubmit.Visible = false;

}

protected void btnGenerate_Click(object sender, EventArgs e)

{

CreateTextBoxes();

}

protected void btnSubmit_Click(object sender, EventArgs e)

{

strValue = string.Empty;

string values = txtFields.Text;

string[] value = values.Split(',');

int n =value.Count();

for (int i = 0; i <= n; i++)

{

// value[i].Text = "txt" + value[i].ToString();

string boxName = "txt" + (i + 1).ToString();

TextBox txt = phTextBoxes.FindControl(boxName) as TextBox;`enter code here`

strValue += txt.Text + "\n";

//btnSubmit.Click += new EventHandler(btnSubmit_Click);

}

Response.Write(values);

}

private void CreateTextBoxes()

{

string values = txtFields.Text;

string[] value = values.Split(',');

for (int j = 0; j < value.Count(); j++)

{

TextBox txt = new TextBox();

//Add berek so the next textbox will create in next new line

Literal lit = new Literal();

lit.Text = "

";

Label lbl = new Label();

txt.ID = "txt" + value[j];

txt.EnableViewState = true;

//btnGenerate.Click += new EventHandler(btnGenerate_Click);

lbl.ID = "lbl" + value[j];

lbl.Text = value[j] + ": ";`enter code here`

form1.Controls.Add(lbl);

form1.Controls.Add(txt);

form1.Controls.Add(lit);

panelform.Controls.Add(lbl);

panelform.Controls.Add(txt);

panelform.Controls.Add(lit);`enter code here`

panelform.Controls.Add(btnSubmit);

}

panelform.Visible = true;

btnSubmit.Visible = true;

}

enter code here