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About Syed Rizwan Muhammad Rizvi
Expertise
I can answers questions regarding web based and desktop based programming in VB.Net. Which can include SOAP, XML, Custom Controls, COM Interoperability etc.

Experience
Have been working in this specific area for last 2 years previously I was a VB 6 Developer with experties in other languages as well. Total 10 years of programming experience.

 
   

You are here:  Experts > Computing/Technology > Basic > VB.NET > Validation in user log in

Topic: VB.NET



Expert: Syed Rizwan Muhammad Rizvi
Date: 7/7/2008
Subject: Validation in user log in

Question
Hello Sir

Can you help me validate this code because even i tried to type the wrong password still it open my main form.

   Private Sub OK_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles okbutton.Click
       Dim ReadUsername As System.IO.StreamReader = New System.IO.StreamReader("C:\Accounts\Usernames.txt")
       Dim Uline As String
       Dim ReadPassword As System.IO.StreamReader = New System.IO.StreamReader("C:\Accounts\Passwords.txt")
       Dim Pline As String

       Do
           Pline = ReadPassword.ReadLine()
           Uline = ReadUsername.ReadLine()
           Console.WriteLine(Pline)
           Console.WriteLine(Uline)

       Loop Until Uline Is Nothing
       If usernametextbox.Text = "" Then
           MsgBox("Please enter a valid username")
           Exit Sub
       End If

       If passwordtextbox.Text = "" Then
           MsgBox("Please enter a valid password")
           Exit Sub
       End If

       
       If Uline = ReadUsername.ReadLine() = True Then
           MsgBox("Enter a Username")
       End If
       If Pline = ReadPassword.ReadLine() = False Then
           MsgBox("Enter a Password")
       Else
           MainFormApplication.Show()
           Me.Close()

       End If


   End Sub

Answer
      Do
          Pline = ReadPassword.ReadLine()
          Uline = ReadUsername.ReadLine()
          Console.WriteLine(Pline)
          Console.WriteLine(Uline)

      If usernametextbox.Text = "" Then
          MsgBox("Please enter a valid username")
          Exit Sub
      End If

      If passwordtextbox.Text = "" Then
          MsgBox("Please enter a valid password")
          Exit Sub
      End If

      if Uline = usernametextbox.text and pline=passwordtextbox.text Then
ReadPassword.close()
ReadUsername.close()
          MainFormApplication.Show()
          Me.Close()
          exit do
      End If
      Loop Until Uline Is Nothing
ReadPassword.close()
ReadUsername.close()

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