Dynamic Controls events

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ASP.NET

I have added buttons and some others conrols dynamically as follows:

I want to handel events of button. Currently it gives me the error "Multiple Controls with same ID 'xx' found"..So how to deals with this situation...suppose i have create only one button then its event will be handel successfully. Problems occurs with multiple buttons...

for (int i = 0; i < dt1.Rows.Count-3; i++)
{
pnlTextBox = new Panel();
pnlTextBox.ID = "pnlTextBox" + i.ToString();
pnlTextBox.CssClass = "tagpanel";


TextBox txt = new TextBox();
txt.ID = (i + 1).ToString();
txt.CssClass = "txtb";
txt.Text = dt1.Rows[i][3].ToString();
txt.Enabled = false;
txt.AutoPostBack = true;

ImageButton img = new ImageButton();
img.ID = "img_" + i.ToString();
img.Click += new ImageClickEventHandler(img_Click);

img.ImageUrl = "~/images/TagClose.png";
img.CssClass = "icons";


Button Btn = new Button();
Btn.ID = "Btn_" + i.ToString();
Btn.Text = "Save";
Btn.CssClass = "btnCss";
Btn.Click += new EventHandler(Btn_test);

Literal ltbr1 = new Literal();
ltbr1.Text = "
";

Literal ltbr = new Literal();
ltbr.Text = "
";

Label lbl = new Label();
lbl.ID = i.ToString();
lbl.CssClass = "lblCss";
lbl.Text = dt1.Rows[i][0].ToString();


pnlTextBox.Controls.Add(txt);
pnlTextBox.Controls.Add(img);
pnlTextBox.Controls.Add(ltbr1);
pnlTextBox.Controls.Add(lbl);
}