Get value of dynamic controls

Hello,
I've put some controls dynamically on the page. Here's some code:
protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                Table table = new Table();
                TableRow row = new TableRow();
                TableCell cell = new TableCell();
                TextBox txt = new TextBox();
                txt.ID = "myTextBox";
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