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Visual Studio 2005 VB.Net Variable Values Showing in Hex

Posted on 2009-05-06
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Last Modified: 2013-11-26
I developing a windows project in visual studio 2005.  I noticed some code is not getting the right results.  In the following code sample,  If Not IsNothing(ID) Then, is always true.  I checked the Value of ID and it was &H0.

How can I fix this?  Thanks in advance
Public Sub Login(ByVal UserName As String, ByVal Password As String, ByVal RememberMe As Boolean)
        Dim ID As Integer
        ID = clsDatabase.GetReaderSingleValue("SELECT ID FROM tblUsers WHERE Username = '" & UserName & "' AND Password = '" & Password & "'", CommandType.Text)
        If Not IsNothing(ID) Then
            GetUserByID(ID)
            Authenticated = True
        End If
    End Sub

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Question by:moraleskp
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3 Comments
 
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Expert Comment

by:JackOfPH
ID: 24321490
Try this approach:




Public Sub Login(ByVal UserName As String, ByVal Password As String, ByVal RememberMe As Boolean)
        Dim ID As Integer
        ID = clsDatabase.GetReaderSingleValue("SELECT ID FROM tblUsers WHERE Username = '" & UserName & "' AND Password = '" & Password & "'", CommandType.Text)
        If Not ID is noting Then
            GetUserByID(ID)
            Authenticated = True
        End If
    End Sub

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LVL 15

Expert Comment

by:JackOfPH
ID: 24321497
opps, typing error, It should be ...

If Not ID is nothing Then

so the code should be like this



Public Sub Login(ByVal UserName As String, ByVal Password As String, ByVal RememberMe As Boolean)
        Dim ID As Integer
        ID = clsDatabase.GetReaderSingleValue("SELECT ID FROM tblUsers WHERE Username = '" & UserName & "' AND Password = '" & Password & "'", CommandType.Text)
        If Not ID is nothing Then
            GetUserByID(ID)
            Authenticated = True
        End If
    End Sub

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Accepted Solution

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moraleskp earned 0 total points
ID: 24321927
thanks for the reply jack.
The clsDatabase procedure was returning nothing with converted to 0 in ID.  I changed the datatype of ID to nullable (of integer)  and the if worked.  The hex values was because the hexadecimal display button was depressed.  until a few minuets ago, I did not know about this.
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