Not geting textbox value

protected void lnk_Click(object sender, EventArgs e)
       {


           for (int i = 0; i < 10; i++) // Loop for Row
           {
               string txtvalue1 = "TextBoxCol_" + i.ToString();

               TextBox txt1 = (TextBox)Page.FindControl(txtvalue1);


                if (txt1 != null)
           {
               try
               {

                   string strText1 = txt1.Text;
                  // int ItemId = TaxItemMasterPayrollDB.AddItem(str);

               }
               catch (Exception ex)
               {
                   throw ex;
                   //lbl_error.Text = "There is a Problem while creating Account ";

               }
           }