TextBox TextChange not working

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ASP.NET

I havs a TextBox_TextChange depending on the user Level it will do the math function that is set up for that user. I have an If Else statement in place. When I enter a number into a textbox and hit tab or click ti the next textbox it should fire the Textbox_Textchange and fire the math operators if the user has semester level or a quarter level. The math operator or If Else statement is not working. What is wrong with the code?

protected void TextBoxNCC_TextChanged(object sender, EventArgs e)
   {
       SqlConnection con = new SqlConnection(System.Configuration.ConfigurationManager.ConnectionStrings["HotConnectionString"].ConnectionString);
       con.Open();

       if (true)
       {
           SqlCommand level = new SqlCommand("Select INST_ID, Calendar from Table44 where INST_ID = @INST_ID", con);
           level.Parameters.Add(new SqlParameter("INST_ID", TextBoxINST_ID.Text));


           SqlDataReader reader = level.ExecuteReader();
           DataTable dt1 = new DataTable();
           dt1.Load(reader);

           foreach (DataRow dr1 in dt1.Rows)
           {
              string returnedLevel = (dr1[0].ToString());
               int inst_id = Convert.ToInt32(dr1[2].ToString());
               Session["inst_id"] = inst_id;

               if (returnedLevel == "Semester")
              {
                  int i = Convert.ToInt32(TextBoxNCC.Text);
                  int j = 168;
                  TextBoxNCCDR.Text = Convert.ToString(i / j);

              }
              else if (returnedLevel == "Quarter")
              {
                  int i = Convert.ToInt32(TextBoxNCC.Text);
                  int j = 120;
                  TextBoxNCCDR.Text = Convert.ToString(i / j);
              }
               }
           }
       }
   }

<td class="style27">
                <asp:TextBox ID="TextBoxNCC" runat="server" Width="180px" 
                    ontextchanged="TextBoxNCC_TextChanged" AutoPostBack="True"></asp:TextBox>
            </td>