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Can someone please explain to me the logic and theory of why we need to use Table adapters. I know they are important in terms accessing your data from your database (access database is what im using because our computers do not have SQL on them at uni)and putting it into a dataGrid on a windows application, but i still have no concept on how to do that as our tutors didnt go over then in details.
for example my Code: it will not run past since i hve not declaired CheckUserAdapter and CheckUserTable, but im not sure how to.
Public Function UserPasswordMatches(ByVal userName As String, ByVal password As String) As Boolean
CheckUserAdapter.Fill(CheckUserTable)
Dim CheckUserDataView As DataView = CheckUserTable.DefaultView
CheckUserDataView.RowFilter = "Name = '" + userName + "'"
With CheckUserDataView
If .Count > 0 Then
Dim SecretKey As String = "785&*(%HUYFteu27^5452ewe"
If .Item(0).Item("Password").ToString.Trim <> vbNullString Then
Dim EncryptedPassword As String = Encryptstring(password, SecretKey)
If .Item(0).Item("Password").ToString.Trim = EncryptedPassword Then
Return True
Else
Return False
End If
Else
If password = vbNullString Then
Return True
End If
End If
Else
Return False
End If
End With
End Function
Thankyou
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Can i call java code from vb.net , is there any way to do it ?
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Not directly.
You have to use something in common that the two runtimes can use to communicate through. In this case, I believe that's COM. Depending on which codebase you want to use as a server, that code would have to expose some kind of COM interface (wrapper) so the other runtime can call it. In VB.NET, this is relatively easy. In Java, I have no idea what's involved, or if it's even possible. But, the client would just instantiate the server just like any other COM-based component.
Dave Kreskowiak
Microsoft MVP - Visual Basic
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I think Java does CORBA and not COM.
Christian Graus - Microsoft MVP - C++
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Well, You can either use J#. Or, use IKVM to call the Java Code. But, don't expect it to be fast, since you're running a VM on a VM....
Yuvi Panda T
Microsoft Student Partner
Blogs at : http://yuvipanda.blogspot.com
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i think i will try to use IKVM cause my code is not big so it will run with normal speed
thanks all
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Hello!
The subject is not directly related to vb.net. However, I got the best answers from this forum so I decided to ask you.
My asp page shows pictures of the estates in the page. What I want is to put a transparent water mark on the pictures automatically if they have been rented or sold. How can I do that without developing an application to do it?
Can I put one transparent picture above another one in the same cell of the table?
Thanks
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B Journey wrote: My asp page shows pictures of the estates in the page. What I want is to put a transparent water mark on the pictures automatically if they have been rented or sold. How can I do that without developing an application to do it?
You can't. You'll be writing an ISAPI extension to handle the JPG extension to add the watermark. You can find an example here[^].
Dave Kreskowiak
Microsoft MVP - Visual Basic
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How can I convert a VB6 project to VB.Net
... Most people can speak several languages but I speak only one; that's 01010110 ...
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All you have to do is open the VB6 .VBP file from the File/Open menu. This will automatically launch the Visual Basic Upgrade Wizard to try and convert the project.
Be warned though! This will NOT convert every project to VB.NET and the code that code convert is not necessarily the best way to do things in VB.NET, nor is it the best performing code. Also, if you plan to alter the code in the converted app, be prepared to have a hard time getting questions answered. The VBU Wizard can generate code that's difficult to follow, let alone debug.
The BEST solution for upgrading a VB6 app to .NET is to scrap it and rewrite it from scratch!
Dave Kreskowiak
Microsoft MVP - Visual Basic
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 i am using richtextbox for input mathematical equations & formule. how can i access(place) ms eqaution editor in ritchtextbox? how can i access windows/ ms word toolbar in my application without open document?
-- modified at 1:00 Monday 24th April, 2006
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IN A PROJECT, i extended picturebox class, then added a context menu to picture box.
in a form , i used picturebox, how to add new contextmenuitems to picture box?
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The extact same way...
Create a ContextMenuStrip object and fill in the stuff you want, then go into the properties of the PictureBox control and change its ContextMenuStrip property to the name of your menu.
Dave Kreskowiak
Microsoft MVP - Visual Basic
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In my project i have to show a form using a string variable, that means
the form name is available in a string variable like,
strFormToShow = "Form2" and form2 is available in my project. How can i
show this form2 using this string variable ?
pls help me, urgent
regards
ajo
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First rethink your pbolem. Is this really the way you would like to open forms? I smell a bad design 
But anways, look at Reflection, that should be the solution for your problem.
--------------------------------------------------------
My development blog
Q:What does the derived class in C# tell to it's parent?
A:All your base are belong to us!
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I agree with CWIZO. There's NEVER a reason to tie data directly to the names of objects in your code. This reeks of a bad design waiting to explode in your face.
Dave Kreskowiak
Microsoft MVP - Visual Basic
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Hi. Does anyboy know how to make a plug-in with vb.net that works on browsers , like Yahoo! toolbar , Google toolbar ,.....
plesae help me!
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Can somebody please send me the steps to do the crystal reports
Thank You
Pankaj Garg
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You'll have to be a LOT more specific than that. You're just asked a question akin to something like, "Can someone please send me all the steps for driving a car?"
Crystal Reports docs on MSDN[^].
Dave Kreskowiak
Microsoft MVP - Visual Basic
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What is the difference between byval and byref?
What is the difference b/w c# and vb.net?
Thank You
Pankaj Garg
-- modified at 3:34 Sunday 23rd April, 2006
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pankajgarg12 wrote: What is the difference between byval and byref?
Passing a variable to a Procedure or Function ByVal means that the actual value of the variable is placed on the stack. If you pass it ByRef, only a reference (i.e. pointer) to the variable will be placed on the stack.
A ByRef will allow the called function to modify the actual source variable. A ByVal call never touches the original variable.
Depending on the size of the variable and/or its purpose, you can use either in your own code. If you have a large array for example, it would be better to pass it as ByRef so that you don't put too much information on the stack.
pankajgarg12 wrote: What is the difference b/w c# and vb.net?
They are both programming languages. VB.NET's ancestor is Visual Basic, C#'s ancestry is from C and C++. Use whichever you are most familiar and comfortable.
...Steve
1. quod erat demonstrandum
2. "Give a man a fish and you've fed him for a day. Teach him how to fish and you've fed him for life." I read that somewhere once
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Thanks for pointing out that passing by reference when you are dealing with large amounts of data is the way to go. I am going back to school after many years and the instructor said that passing by value is faster and more efficient. I do not want to tell the instructor (masters degree) that he does not know what he is talking about (grades are on the line), but that is a fact.
By the way, I am going back to school because 15 years of experience does not qualify me to teach.
INTP
“Testing can show the presence of errors, but not their absence.”
Edsger Dijkstra
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John R. Shaw wrote: the instructor said that passing by value is faster and more efficient.
Well yes - it depends on the nature of the data that you are processing. For small data (e.g. a single Integer) then passing ByVal is fine. An array of 100 Integers or a 128kB image is a bit too much.
One thing to keep in mind is that a ByVal parameter actually causes a COPY of that variable (Integer, Array, String etc...) to be made and placed onto the stack. A ByRef creates a pointer to the ORIGINAL variable so only one exists - and that's why ByRef variables can be modified by called functions, so you must be aware of this desired (or undesired) behaviour. It can cause program errors.
As an aside - ByVal variables can also be modified by the called function, but you are only modifying the copy and not the original so any changes are lost when the function returns to its caller.
...Steve
1. quod erat demonstrandum
2. "Give a man a fish and you've fed him for a day. Teach him how to fish and you've fed him for life." I read that somewhere once
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Thanks for the well written reply. I did not mean to give the impression that I did not know this already, just that the instructor made a blanket statement that is not always true.
I have been writting software for many years and prefer C++, but I do not have a degree. The class I just finished taking yesterday was on programming in VB.Net. I expect my total score to be 993 out of a possible 1000, do to a minor disagreement with the instructor. 
INTP
“Testing can show the presence of errors, but not their absence.”
Edsger Dijkstra
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I need to get a list of first and last names from a database. These names are together in one column and need to be split into two seperate columns. I can get the names from the database and I put them into a dataset. I can't figure out how to seperate the names so I can put them in seperate columns. Can anyone help? Thanks
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