create text box dynamically by value of user and get value from this textboxes

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ASP.NET

C#3.5

C#5.0

text

i try to create dynamic text box and get the data from this textboxes and its successfully if i put the number of textboxes that i need in the C# code

but if i created textbox to receive the repeated number from the user i have an error told me Input string was not in a correct format.

this my code with fixed number in the code

protected void Page_PreInit(object sender, EventArgs e) { List keys = Request.Form.AllKeys.Where(key => key.Contains("txtDynamic")).ToList(); int i = 1; foreach (string key in keys) { this.CreateTextBox("txtDynamic" + i); i++; } }

protected void AddTextBox(object sender, EventArgs e)
{
    int index = pnlTextBoxes.Controls.OfType<TextBox>().ToList().Count + 1;
    this.CreateTextBox("txtDynamic" + index);
}

private void CreateTextBox(string id)
{

        TextBox txt = new TextBox();
        txt.ID = id;
        pnlTextBoxes.Controls.Add(txt);

        Literal lt = new Literal();
        lt.Text = "<br />";
        pnlTextBoxes.Controls.Add(lt);

}

protected void GetTextBoxValues(object sender, EventArgs e)
{
    string message = "";
    foreach (TextBox textBox in pnlTextBoxes.Controls.OfType<TextBox>())
    {
        message += textBox.ID + ": " + textBox.Text + "\\n";
    }
    ClientScript.RegisterClientScriptBlock(this.GetType(), "alert", "alert('" + message + "');", true);
}

this is my change to receive the number of textboxes from the user

private void CreateTextBox(string id) { int x = Convert.ToInt32(txtNum.Text); for (int i = 0; i < x; i++) { TextBox txt = new TextBox(); txt.ID = id; pnlTextBoxes.Controls.Add(txt);

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

please advice