Visual Basic

Re: recently migrated from VB6...debating on C# or VB.NET

5-Aug-05 4:38

JoeySpimoley wrote:
But which is a better language to pursue first VB or C#.

Like anything else, it's a matter of preference. If you're going to learn both, neither is that much better than the other. There are some things that VB.NET supports that C# doesn't and there are things that C# supports that VB.NET doesn't.

For instance, I'm writing an application that has a front end written in VB.NET and all the image processing code behind it is written in C#. (Christian -> Thanks for the image processing articles! Big Grin | :-D

)

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Dave Doknjas5-Aug-05 14:54

Dave Doknjas

5-Aug-05 14:54

As the other reply stated, both are very close as far as features and power.

It really is a matter of style and preference. VB.NET will be easier for you since you have a VB6 background. On the other hand, C# is also very easy to pick up if you have a VB background.

To sum up the different styles:
VB.NET: Descriptive syntax and multiple syntax alternatives
C#: Concise and elegant code with virtually no ambiguous syntax

David Anton
Tangible Software Solutions
www.tangiblesoftwaresolutions.com
Home of:
Instant C#: VB.NET to C# Converter
Instant VB: C# to VB.NET Converter
Instant J#: VB.NET to J# Converter

Re: recently migrated from VB6...debating on C# or VB.NET

JoeySmith5-Aug-05 16:56

JoeySmith

5-Aug-05 16:56

I think I am going to go with VB.NET then learn C# at a later time.

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Spimoles.NET

clean and elegant. a beautiful craft

how can i load data back onto treenodes

fareee4-Aug-05 20:59

fareee

4-Aug-05 20:59

can anyone tell me how can i load data back onto treenode from access database ???
thanku

Re: how can i load data back onto treenodes

Dave Kreskowiak5-Aug-05 4:32

Re: how can i load data back onto treenodes

5-Aug-05 4:32

If you're adding a single level of nodes to the TreeView...assuming VB.NET...

TreeView1.Nodes.Clear()
objCon.Open()
adapter1 = New Odbc.OdbcDataAdapter("Select * from RemoteHost", objCon)
data = New DataSet
adapter1.Fill(data, "RemoteHost")

' This part assumes that a table called "RemoteHost" actually exists in the dataset,
' and the a column called "General" exists in that table!
Dim I As Integer
With data.Tables("RemoteHost")
    For I = 0 To .Rows.Count - 1
        Dim newNode As New TreeNode( .Rows(I).Item("General").ToString() )
        newNode.ImageIndex = 0
        TreeView1.Nodes.Add(newNode)
    Next
End With
objCon.Close()

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Anonymous6-Aug-05 6:09

Anonymous

6-Aug-05 6:09

still havin error on this line of code objCon.Open()

An unhandled exception of type 'System.NullReferenceException' occurred in tab.exe

Additional information: Object reference not set to an instance of an object.

XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

TreeView1.Nodes.Clear()
objCon.Open()
adapter1 = New Odbc.OdbcDataAdapter("Select * from RemoteHost", objCon)
data = New DataSet
adapter1.Fill(data, "RemoteHost")
' This part assumes that a table called "RemoteHost" actually exists in the dataset,
' and the a column called "General" exists in that table!
Dim I As Integer
With data.Tables("RemoteHost")
For I = 0 To .Rows.Count - 1
Dim newNode As New TreeNode(.Rows(I).Item("General").ToString())
newNode.ImageIndex = 0
TreeView1.Nodes.Add(newNode)
Next
End With
objCon.Close()

Re: how can i load data back onto treenodes

Dave Kreskowiak6-Aug-05 6:45

6-Aug-05 6:45

Uhhh...Did you actually create a Connection object?

Where is objCon defined? Was it actually created with a New? Was it assigned somewhere else, but not filled in with the connection details?

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

DLL from project VB

Roirin4-Aug-05 20:59

Roirin

4-Aug-05 20:59

It is possible to open to an application NET (DLL) from a project VB6?
It would interest to send from an application VB a .NET form

Thanks

Dave Kreskowiak5-Aug-05 4:24

5-Aug-05 4:24

You're not being very clear about what you want.

But, it is possible to use a VB.NET .DLL in a VB6 application. The opposite is also true.

How to call a Visual Basic .NET assembly from Visual Basic 6.0 and how to call a call Visual Basic COM component from Visual Basic .NET[^]
Accessing the Event Log from VB6 using the .NET Framework (using a COM wrapped .NET class)[^]

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Roirin7-Aug-05 20:19

Roirin

7-Aug-05 20:19

Thanks, but this was not exactly what I wanted. I have a MdiContainer form in a project VB6 and have an application (form) in NET. What I wanted I was to be able to call to the form of NET from VB6 doing it MDIChildren.

I have been able to call the form NET from VB6, but what with himself he is that habra like a new window and not like a MdiChildren.

Thanks in advance

Dave Kreskowiak8-Aug-05 1:53

8-Aug-05 1:53

Roirin wrote:
Thanks, but this was not exactly what I wanted. I have a MdiContainer form in a project VB6 and have an application (form) in NET.

You didn't post any specifications like this at all, in fact, you didn't post ANY specifications. You got links to documents that generally covered your very general specs.

Roirin wrote:
I have a MdiContainer form in a project VB6 and have an application (form) in NET. What I wanted I was to be able to call to the form of NET from VB6 doing it MDIChildren.

You have to do the very same thing that's covered in those documents. Your classes, and even a Form is a class, must be exposed to COM so VB6 can use it. Without that, you're sunk.

I've never done it, because I've never had the requirements to do it. In theory, it should work. But I there are potential problems, simply because VB6 and VB.NET manage Forms so differently.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Roirin8-Aug-05 20:48

Roirin

8-Aug-05 20:48

I was able yesterday to do what wanted.
In this page http://www.codecomments.com/archive293-2004-7-228359.html they indicate like opening a form to you within another one, the only thing that I had to replace "hChild" by the "Handle" of the form NET For it I made a method I publish:
Form VB .NET in a project of libreria of classes
Public Function getHandle() As System.IntPtr
getHandle = Me.Handle
End Function

ActiveX Document
'To create the reference to the class .NET

Private Sub initialize()
Dim hChild As Long
Dim hParent As Long
Dim f As New ClassLibrary2.Form1
Dim b As Boolean
hChild = f.getHandle()
hParent = UserDocument.hwnd
b = SetAsParent(hChild, hParent) 'this function is in the Web
f.Show
End Sub

Thanks

Dave Kreskowiak9-Aug-05 1:54

9-Aug-05 1:54

Cool!

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

parse treeview

fareee4-Aug-05 20:56

fareee

4-Aug-05 20:56

can anyone tell me how to parse treeview

Re: parse treeview

Dave Kreskowiak5-Aug-05 4:20

Fractions in Visual Basic.Net

5-Aug-05 4:20

That all depends on what you mean by parse?

Parse a string returned by a TreeViewNode? Walk the Tree? What?

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Re: parse treeview

Anonymous6-Aug-05 5:58

Anonymous

6-Aug-05 5:58

i m so sorry that i didnt mention ..
yeah i mean how to Parse a string returned by a TreeViewNode...

Re: parse treeview

Rob Graham7-Aug-05 15:31

Rob Graham

7-Aug-05 15:31

Parse the string to what end? are you tying to convert it to a number or what?

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parse treeview

fareee4-Aug-05 20:32

fareee

4-Aug-05 20:32

can anyone tell me how to parse treeview data ????

Desi Bravo4-Aug-05 19:00

Desi Bravo

4-Aug-05 19:00

I am using visual basic.net only.
I need some help in fractions. How can I use the fractions in system.math to create a fraction program?
I will use two textboxes and a label for the answer within a form
and i will be adding, subtracting, multiplying, and dividing. Can anyone assist with a sample code?
Smile | :)

bravo659

Christian Graus4-Aug-05 19:02

Christian Graus

4-Aug-05 19:02

What fractions in System.Math ? VB.NET has numeric types, your core need is Convert.ToDouble(), to convert the text entered into a non-whole number, and ToString, to convert back to a string to put in the label. The rest is trivial.

Christian Graus - Microsoft MVP - C++

Desi Bravo4-Aug-05 20:49

Desi Bravo

4-Aug-05 20:49

I appreciate for your time. I am an intermediate programmer, I am not an expert like you. So being trivial I really dont think so in my part. I am trying to learn this solution. I enter a numerator and denominator in the textboxes. There is no text to convert. Trying to figure out how to use the numerator and denominator in a fractional sense in a program. Don't know if i would use the abs or just something else to get the result in the label as a fraction.

Christian Graus7-Aug-05 13:14

Christian Graus

7-Aug-05 13:14

There is nothing in the Math namespace to show fractions as fractions. You need to convert to numbers, work out a whole number part, and render it all as text yourself.

Christian Graus - Microsoft MVP - C++