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Login Control UserName Only Accept the Initial Test Value of UserName and Password, Can't Test Any other set
Posted on 2012-12-28
Hi,
I am a beginner of .Net Web Developer.
I programmed a simple Web app in VB.NET 2005 to let an user log in at first, and the UserName will be passed to the next page for displaying his or her relevant information .
the Login Control connects to a data table in SQL Server 2005 for log in authentication. I used UserID stored in the database as value of UserName text field of the Login control.
The problem is, during my many tests, only the very first UserID and password (the password is actually an user's last name) got successfully log in, no matter how many time to repeat to use this set of value. Except this set of value, the Login process was never succeed when using any other pairs of UserID and LastName, even I ensured to type in correct value in the text fields.
Your advise will be very appreciate!
Part of my code: --------------------------
Private Function YourValidationFunction(ByV
Dim boolReturnValue As Boolean = False
Dim strConnection As String = "Data Source=myServerName;Initia
Dim sqlconnection As New SqlClient.SqlConnection(st
Dim SQLQuery As String = "SELECT distinct [UserId],[Last name] FROM myUserTable"
Dim command As New SqlClient.SqlCommand(SQLQu
Dim Dr As SqlClient.SqlDataReader
sqlConnection.Open()
Dr = command.ExecuteReader()
While Dr.Read()
If (UserName = Dr("UserID").ToString()) And (Password = Dr("Last name").ToString()) Then
boolReturnValue = True
End If
Dr.Close()
Return boolReturnValue
End While
Return boolReturnValue
End Function
I am a beginner of .Net Web Developer.
I programmed a simple Web app in VB.NET 2005 to let an user log in at first, and the UserName will be passed to the next page for displaying his or her relevant information .
the Login Control connects to a data table in SQL Server 2005 for log in authentication. I used UserID stored in the database as value of UserName text field of the Login control.
The problem is, during my many tests, only the very first UserID and password (the password is actually an user's last name) got successfully log in, no matter how many time to repeat to use this set of value. Except this set of value, the Login process was never succeed when using any other pairs of UserID and LastName, even I ensured to type in correct value in the text fields.
Your advise will be very appreciate!
Part of my code: --------------------------
Private Function YourValidationFunction(ByV
Dim boolReturnValue As Boolean = False
Dim strConnection As String = "Data Source=myServerName;Initia
Dim sqlconnection As New SqlClient.SqlConnection(st
Dim SQLQuery As String = "SELECT distinct [UserId],[Last name] FROM myUserTable"
Dim command As New SqlClient.SqlCommand(SQLQu
Dim Dr As SqlClient.SqlDataReader
sqlConnection.Open()
Dr = command.ExecuteReader()
While Dr.Read()
If (UserName = Dr("UserID").ToString()) And (Password = Dr("Last name").ToString()) Then
boolReturnValue = True
End If
Dr.Close()
Return boolReturnValue
End While
Return boolReturnValue
End Function
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2 Comments
The problem is that you have return statement within your While loop which means that while loop only executes once.
I would change your code to below
I would change your code to below
Private Function YourValidationFunction(ByVal UserName As String, ByVal Password As String) As Boolean
Dim boolReturnValue As Boolean = False
Dim strConnection As String = "Data Source=myServerName;Initial Catalog=myDatabaseName;Integrated Security=True;"
Dim sqlconnection As New SqlClient.SqlConnection(strConnection)
Dim SQLQuery As String = "SELECT Count(UserID) FROM MyUserTable Where [UserId]=@UserID AND [Last name]=@LastName"
Dim command As New SqlClient.SqlCommand(SQLQuery, sqlconnection)
sqlConnection.Open()
command.Parameters.AddWithValue("@UserID", UserName)
command.Parameters.AddWithValue("@LastName", Password)
Dim cnt As Integer = command.ExecuteScalar()
If cnt = 1 Then
boolReturnValue = True
End If
command.Dispose
sqlConnection.Dispose
Return boolReturnValue
End Function
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