login form for web services vb.net


I'm trying to create a windows form with  web services that check if the user and password are the same within the SQL SERVER DATABASE, if its the same then your a valid user if not your an invalid user. That is working ok, but I want to implement a try statement which only allows the user to enter in the details 3 times then the windows form shuts down. also if they do have it correct then another window opens up. ANY HELP PLEASE OR IF SOME 1 KNOWS HOW TO DO IT IN  ASP.NET :>


<WebMethod()> _
        Public Function CheckUserDetails(ByVal UserName As String, ByVal Password As String) As String

        Dim strConnBuild As New SqlConnectionStringBuilder
        Dim strsql As String

        With strConnBuild
            .DataSource = "BUSDEV"
            .InitialCatalog = "StudentTrig"
            .UserID = "vbasic"
            .Password = "vbasic"
        End With

        strsql = "SELECT * FROM UserDetails WHERE UserName = '" & UserName & "' AND " & "Password = '" & Password & "'"
        Dim cmd As SqlCommand
        Dim rdr As SqlDataReader

        Using conn As New SqlConnection(strConnBuild.ConnectionString)

                cmd = New SqlCommand(strsql, conn)

                rdr = cmd.ExecuteReader()

                If rdr.HasRows Then
                    Dim user As String = rdr.Item(0)
                    Dim userpassword As String = rdr.Item(1)
                    If user = UserName And Password = userpassword Then
                        Return "Valid User"
                    End If

                    Return "Invalid User"

                End If

            Catch ex As Exception

        End Using

        Return "Invalid User"
        Else Trys < 2 'Not 3rd try yet
                    Try catch + = 1
            MsgBox("Incorrect details")
            elseif 'Third try so kick them out
            Dim i As Integer = MsgBox("incorrect details, please try again later")
        End Try
    End Function




1/29/2009 3:41:36 PM
asp.net.xml-web-services 7071 articles. 0 followers. Follow

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You should implement the retry logic on the client. The service cannot display a message box on the client, and could not shut down the windows form.

Besides, web services are better off if they have no state. So it's best if the service doesn't know how many times the login attempt has failed.

John Saunders | MVP – Connected System Developer
1/29/2009 6:11:50 PM

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