msgbox (Thread was being aborted) ด้านในเกิดขึ้นมาได้เพราะอะไร ทั้งที่ไม่ได้มี error อะไรนะครับ ...

<%@ Control Language="vb" AutoEventWireup="false" CodeBehind="loginUser.ascx.vb" Inherits="TEST.loginUser" %>
<%@ Import Namespace="System.Data" %>
<%@ Import Namespace="System.Data.SqlClient" %>
<script runat="server">    
    Sub submit_click(ByVal sender As Object, ByVal e As EventArgs)
        Dim user As String = Me.txtuser.Text
        Dim pass As String = Me.txtpass.Text
        Dim objCon As SqlConnection
        Dim objCmd As SqlCommand
        Dim sql As String
        Dim strConnection As String = ConfigurationManager.ConnectionStrings("strConnection").ConnectionString
        Dim intNumRows As Integer
        Try
            sql = "select count(*) from username where uid = '" & user & "' and password = '" & pass & "'"
            objCon = New SqlConnection
            With objCon
                .ConnectionString = strConnection
                .Open()
            End With
            objCmd = New SqlCommand
            With objCmd
                .Connection = objCon                    
                .CommandText = sql
                .CommandType = CommandType.Text
            End With
            intNumRows = objCmd.ExecuteScalar
            If intNumRows > 0 Then                
                Session.Add("username", user)
                Response.Redirect("addData.aspx")
            Else
                MsgBox("username or password is incorrect !!!")
            End If            
        Catch ex As Exception
            MsgBox(ex.message)
        End Try
        objCon.Close()
        objCon = Nothing
    End Sub  
</script>
<asp:Panel ID="PaneLogin" runat="server">
    <asp:Label ID="Label1" runat="server" Text="username: " Width="100px"></asp:Label>
    <asp:TextBox ID="txtuser" runat="server" MaxLength="12" Width="200px"></asp:TextBox>
    <asp:RequiredFieldValidator ID="checktxtuser" runat="server" 
        ErrorMessage="*Username Require" ControlToValidate="txtuser"></asp:RequiredFieldValidator>
    <br />
    <asp:Label ID="Label2" runat="server" Text="password: " Width="100px"></asp:Label>
    <asp:TextBox ID="txtpass" runat="server" MaxLength="12" Width="200px" 
        TextMode="Password"></asp:TextBox>        
    <br />
    <asp:Label ID="Label3" runat="server" Text="" Width="100px"></asp:Label>
    <asp:Button ID="btnsubmitLogin" runat="server" Text="Login" OnClick="submit_click" />
    <br />
    <a href="start.aspx">Register</a>
</asp:Panel>