Accessing a textbox created in the itemdatabound by the repeater's itemcommand

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C#

repeater

I have dynamically created several HtmlTableCell and several TextBox inside the ItemDataBound of my Repeater. I named inside the ForEach with txt1, txt2, etc. When I click the edit button, I need to access them via ItemCommand to put Enable=true, but I can not because, for some reason, my Repeater just lets me access the controls I inserted into the aspx page. I've tried everything, I can not access the TextBox ... If someone can help me, I'll be very grateful. In time: as you can see in the example below, I inserted the TextBox inside the HtmlTableCell object because the columns are dynamic too ...

What I have tried:

/* my Repeater ItemDataBound */
int i = 1;
for(int i = 1; i <= 24; ++i)
{
   double qtd = com.STRTODOUBLE(HI.ToString());
   
   TextBox txtQTD = new TextBox()
   {
      ClientIDMode = ClientIDMode.Static,
      ID = e.Item.ItemIndex.ToString() + "_" + i.ToString(),
      CssClass = "form-control text-center h5 small",
      MaxLength = 12,
      Text = qtd.ToString("n1"),
      Enabled = false
   };

   HtmlTableCell htc = new HtmlTableCell();
   htc.Attributes.Add("class", "text-right");
   htc.Controls.Add(txtQTD);
   tr.Controls.Add(htc);
   ++i;
}

/* my Repeater ItemCommand */
...
if (e.CommandName.ToString() == "HSG")
{
   for (int i = 1; i <= 24; ++i)
   {
      /* I can access any control that was added in the aspx page, but the dynamic control below always returns null value */ 
      TextBox txtQTD = (TextBox)e.Item.FindControl(e.Item.ItemIndex.ToString() + "_" + i.ToString());
      txtQTD.Enabled = true;
      ++i;
   }
}