Lable is not displaying row_updating event in gridview

<div>

    <asp:GridView runat="server" ID="gridEmp" DataKeyNames="empid" AutoGenerateColumns="false" OnRowEditing="GridviewEmpEditing" OnRowUpdating="GridviewEmpUpdating" OnRowCancelingEdit="GridviewEmpCanceling" >

      <Columns>

        <asp:TemplateField HeaderText="Edit">

           <ItemTemplate>
            <asp:LinkButton runat="server" ID="linkEdit" Text="Edit" CommandName="Edit"></asp:LinkButton>
           </ItemTemplate>
           <EditItemTemplate>
             <asp:LinkButton runat="server" ID="linkUpdate" Text="Update" CommandName="Update"> </asp:LinkButton>
             <asp:LinkButton runat="server" ID="linkCancel" Text="Cancel" CommandName="Cancel"> </asp:LinkButton>

           </EditItemTemplate>

        </asp:TemplateField >


         <asp:TemplateField HeaderText="EmpId">

            <ItemTemplate>
                <%# Eval("empid")%>
            </ItemTemplate>
            <EditItemTemplate>
               <asp:TextBox runat="server" ID="txtEmpid" Text='<%# Eval("empid")%>'></asp:TextBox>
            </EditItemTemplate>

         </asp:TemplateField>

         <asp:TemplateField   HeaderText="EmpNo">

            <ItemTemplate>
                <%# Eval("empno")%>
            </ItemTemplate>
             <EditItemTemplate>
              <asp:TextBox runat="server" ID="txtEmpNo" Text='<%# Eval("empno")%>'></asp:TextBox>
            </EditItemTemplate>
         </asp:TemplateField>

         <asp:TemplateField HeaderText="EmpName">

            <ItemTemplate>
               <%# Eval("empname")%>
            </ItemTemplate>
            <EditItemTemplate>
             <asp:TextBox runat="server" ID="txtEmpName"  Text='<%# Eval("empname")%>'></asp:TextBox>
            </EditItemTemplate>

         </asp:TemplateField>

      </Columns>




    </asp:GridView>

      <asp:Label runat="server" ID="lblError"></asp:Label>

   </div>

int Empid = int.Parse(gridEmp.DataKeys[e.RowIndex].Value.ToString());

        GridViewRow row = gridEmp.Rows[e.RowIndex] as GridViewRow;

        TextBox txtEno = row.FindControl("txtEmpNo") as TextBox;
        TextBox txtEname = row.FindControl("txtEmpName") as TextBox;

        if (txtEno.Text == "20" || txtEno.Text == "21")
        {

            string updateCommand = "update empcode set empno=@empno, empname=@empname where empid=@empid";


            SqlConnection con = new SqlConnection(Connstr);
            {

                SqlCommand cmd = new SqlCommand(updateCommand, con);
                {
                    cmd.Parameters.AddWithValue("@empid", Empid);
                    cmd.Parameters.AddWithValue("@empno", txtEno.Text);
                    cmd.Parameters.AddWithValue("@empname", txtEname.Text);
                    con.Open();
                    cmd.ExecuteNonQuery();
                    con.Close();
                }

            }

            gridEmp.EditIndex = -1;
            this.GetData();

        }
     
        else
        {
            lblError.Text = "Error occured please enter 20 or 21";
        }