Making A Login Form On .net For A2 Computing Coursework?

Feb 4, 2010

I'm struggling with making a log in form on vb.net for my A2 computing coursework.

Public Class DbConn
Dim connection As OleDbConnection
Dim cmd As OleDbCommand
Dim dataReader As OleDbDataReader

[code].....

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Making A Login Screen

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I am trying to make it so when a user logs in the code can tell, if they are a user or not, if they are a user, then if they are a teacher or not. I have SQL in there to identify if the person is a user or not, but it won't bring up an error message if they aren't. And if both the users logging in are not teachers they are still able to view a screen they are not meant to.

[Code]...

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The login box is the first box to appear, but after I successfully enter the right username/pass combo it goes to the next form, but the login form stays open as well? I've tried doing this:

Private Sub OK_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles OK.Click
Dim username As String
Dim password As String

[code]....

However, after I click Login it closes down both windows. I've also tried LoginForm.Close() but that comes up with an error.

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This is my current login system:

Sub LogIn()
'A log in system to prevent unwanted users from acsessing the system
Console.Write("Username: ")
Dim username As String = Console.ReadLine.ToLower
If username = "sian" Then

[Code]...

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Public Class Form1
Function MD5Hash(ByVal strToHash As String) As String
Dim md5Obj As New Security.Cryptography.MD5CryptoServiceProvider

[code].....

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Private Sub OK_btn_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles OK_btn.Click
Dim Message As String

[Code].....

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VS 2008 - Making Secure Login System With PHP

Oct 11, 2010

I have making login system using with php. Now I want to hide the link by using strongest MD5 hash, but the one I have got is uncrackable. I want to decrypt them in the runtime, but I couldn't.

Here's the
Public Class Form1
Function MD5Hash(ByVal strToHash As String) As String
Dim md5Obj As New Security.Cryptography.MD5CryptoServiceProvider
Dim bytes() As Byte = System.Text.Encoding.ASCII.GetBytes(strToHash)
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[Code] .....

The GetMD5Hash's method is using for to decrypt the MD5 hash to turns into the actual strings and MD5Hash's method is using for encrypt the strings into md5... However, the connection strings can be sniff the packets sent out. How to decrypt the MD5 hash and how to blocked the connection strings in the packets sent out??

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[Code]...

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I try to make one application that will first show login form (with textbox for username and password) and when I press login client application send request to server side application that make SQL query (local) and return some values and that values will be listed in main form. I try something with TCP chat source codes but I don't manage what I want.

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as this one:

Imports System.Data.OleDb
Public Class LoginForm1
' OK button

[Code].....

but i want to run my application from desktop and will get confirmation if the user name and password correct by checking them in MS Access Database in the server.

so the the application in the desktop and the tabel of user name and password in the server.

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I'm currently making a code that will login to a cisco router, and show the version, then return the version to me. The connection to the cisco router is using telnet, and I'm using Dimac's w3Sockets code to Connect, login, and return data. Reference

But currently I'm having some problems, since the router sometimes need the login typed 2 times, or having a key pressed to update the terminal(telnet),meaning i have to check if it gets logged in or not. But the problem is that using dimac code, i can only wait() and waitFor(), and if it none data comes whilst waiting, it keeps on waiting. Is there away to do like: "if wait fails goto"

I've tryed "on error goto", but since its not a error, but just keeps waiting, that dont work. Also, To locate where it gets stuck I have it write to my textbox everytime it takes a step in the code, but its like the dimac code overtakes vb.net. ex: If i send some text to a textbox in the same sub as the connect code is, and it gets stuck at a wait, it dont even write to the textbox, eventhough the textbox.text command was suppose to execute before the wait().

Code:

Private Sub telnet(ByVal port)

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Try

[CODE]...

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Dim factorial As ULong = 1
Dim i As Integer
For i = 1 To n

[code]....

Unfortunately, running this with the value of 100 for n rseults in

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So, is there a larger data type for holding numbers? Am i mistaken in my methods?

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If it is not possible, then is there any FREE service that provides computing power? Maybe a hosting trial or something. I know that Windows Azure offers a 30-day trial, but it has a very slow CPU module and in my country, MS partners cannot be expected to fix service sites when they go down.

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Private Sub btnPercentage_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnPercentage.Click
Dim team As String

[Code].....

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what must i do? also where would this data be stored...

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I have looked through the code so far and made some guesses to what I think may be on the test:

[code...]

if there is anything I am missing which they think I could be asked on the test. I then have to go away and figure out how to program.

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Assuming as sample dataset of 'byte' with a length of 5
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[Code] .....

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