Visual Basic

Passing Arraylists of Objects to Child Form

20-Feb-07 7:00

Right-click the Toolbox and click on Add/Remove Items... In the dialog that comes up, click on the COM tab and find the Windows Media Player. Double click that to add it to the toolbox. You can then just drag and dorp an instance of it to your form.

Dave Kreskowiak
Microsoft MVP - Visual Basic

Geoff_300120-Feb-07 5:33

Geoff_3001

20-Feb-07 5:33

Hi,

I am trying to pass an arrylist to a child form as below. I get an error saying not posible to cast Stockobj to Stockobj.
If I change the arraylist to contain strings not objs it works fine.
Any clues welcome

Thanks

Parent Form

Public Class Stockobj<br />
        Public Id As Integer<br />
        Public Name As String<br />
        Public Plex As String<br />
    End Class<br />
<br />
Private WithEvents MixForm As MixForm<br />
<br />
Dim StockNameList As New ArrayList<br />
<br />
'Code Populates StockNameList<br />
<br />
Me.MixForm = New MixForm(StockNameList)<br />
Me.MixForm.Show()

Child Form

Public Class Stockobj<br />
        Public Id As Integer<br />
        Public Name As String<br />
        Public Plex As String<br />
End Class<br />
<br />
Dim StockNameList As New ArrayList<br />
<br />
Public Sub New(ByVal StockAliquots As ArrayList)<br />
        InitializeComponent()<br />
End Sub

Re: Passing Arraylists of Objects to Child Form

Dave Kreskowiak20-Feb-07 6:30

Re: Passing Arraylists of Objects to Child Form

20-Feb-07 6:30

You can't have two classes with the same name in the same assembly. You're defining Stockobj twice...

Dave Kreskowiak
Microsoft MVP - Visual Basic

Geoff_300120-Feb-07 7:16

Geoff_3001

20-Feb-07 7:16

Dave I have renamed both destination obj and arraylist i still get the following error
Unable to cast object of type StockObj to NewStockObj. Excepy for the name they are indentical.

Cheers

Re: Passing Arraylists of Objects to Child Form [modified]

TwoFaced20-Feb-07 18:44

TwoFaced

20-Feb-07 18:44

They aren't identical because they are completly different objects Having the same properties and methods doesn't make two objects the same. What you need to do is define StockObj once publicly so that both forms know about it.

Re: Passing Arraylists of Objects to Child Form

Geoff_300120-Feb-07 21:01

Geoff_3001

20-Feb-07 21:01

Ok Thanks, Makes sense wil give it a whirl.

dateandtimepicker in vb.net 2003

kendo1720-Feb-07 5:00

20-Feb-07 5:00

got 1 form with dateandtimepicker on it but trying to send that info to another dtp on another form but the message reads that you cannot convert string to dateandtimepicker.

thank you before hand.

Dave Kreskowiak20-Feb-07 7:09

20-Feb-07 7:09

What's the code you're using to get the value of your first DTP and send it to the next form?

Dave Kreskowiak
Microsoft MVP - Visual Basic

kendo1720-Feb-07 9:22

20-Feb-07 9:22

this code is for the add button on my performance form that will send the details to the reservation form but it says that value of string cannot be converted to 'system windows form.TextBox

frmNewBooking.txtDateOfPerformance = dtpPerformDate.Text

jcrussell20-Feb-07 14:20

jcrussell

20-Feb-07 14:20

the code you want is
frmNewBooking.txtDateOfPerformance.TEXT = dtpPerformDate.Text

you're reading the text out of the DateTimePicker and then you need to assign it to the Text Property of the Textbox. Textboxes are more than just text - they have other properties available

Jason

kendo1721-Feb-07 0:19

21-Feb-07 0:19

yes i dont know what i was thinking had text on the others but missed on the date and time picker cheers. Laugh | :laugh:

VB.NET Certification

Jonathan Gibbs20-Feb-07 4:36

Jonathan Gibbs

20-Feb-07 4:36

Hello folks,
I am working in VB.NET for the last six months and thinking about getting certified, As the structure for certification has changed a bit, would you please point me in the right direction to start with and WHAT WOULD BE THE BEST BOOK FOR PREPARATION.

Cheers!

Re: VB.NET Certification

sathesh pandian20-Feb-07 18:47

sathesh pandian

20-Feb-07 18:47

you can use these materials for your certification preparetion.

1.MCAD/MCSD Self-Paced Training Kit: Developing Windows-Based Applications with Microsoft Visual Basic .NET and Microsoft Visual C# .NET, Second Edition

2.MCAD/MCSD Self-Paced Training Kit: Microsoft .NET Core Requirements, Exams 70-305/70-315, 70-306/70-316, 70-310/70-320, and 70-300

The link for the 70-306 is given below.

http://www.microsoft.com/learning/exams/70-306.mspx#ETC[^]

Sathesh Pandian

Re: VB.NET Certification

Jonathan Gibbs23-Feb-07 2:59

Jonathan Gibbs

23-Feb-07 2:59

As the structure for the certifications have changed to MCTS (70-526, 70-536), I was wandering if there are any other resources than Microsofts own, provided on their website and would it be suitable for me to have a go on the certification with 6 months of expereience.

cheers!

link list

amaneet20-Feb-07 4:04

amaneet

20-Feb-07 4:04

Sir/Madam,
i made the compression program using Huffman Encoding algorithm
in C++ . There i was using the link list concept to store the address of in another variable and it's information part.

I think VB.net does not support these things .
Will intptr an alternative for that .

If Yes please explain with example how to store the address of a variable having an information part.

I am doing a compression program in vb.net

Currently I am using arrays to implement this .

But that is a very lengthy process
Please help.
Thanks and regards
Pankaj

Re: link list

Dave Kreskowiak20-Feb-07 7:08

20-Feb-07 7:08

VB.NET doesn't support pointers, but a linked list is very easy to implement in .NET. Just Google for "VB.NET Linked List" and you'll find a bunch of examples.

Dave Kreskowiak
Microsoft MVP - Visual Basic

aqpplication.run

amaneet20-Feb-07 3:57

amaneet

20-Feb-07 3:57

Sir/Madam,

I was writing the following code on the button click .I am presently on form1

application.run(new form2)
bcos i wanted to navigate to form2
Is the above code correct.
I don't want to use the variable.

Thanks and regards

Re: aqpplication.run

Marcus J. Smith20-Feb-07 4:01

20-Feb-07 4:01

If you do this you are essentially trying to run another application but starting on Form2. You should create an instance of the form such as Dim frmForm2 as new Form2 then any number of variations of hiding the main form, setting it as the owner etc... but then frmForm2.Show().

I hope that helps!

Cleako

Re: aqpplication.run

amaneet20-Feb-07 4:07

amaneet

20-Feb-07 4:07

Sir/Madam,
I am currently on form1
What is the basic meaning of using the following code then
application.run(new form2)
Please help.
Thanks and regards
Pankaj

Re: aqpplication.run

Marcus J. Smith20-Feb-07 4:58

Because a form actually is a class

20-Feb-07 4:58

You would use Application.Run if you ran the whole setup from something like a Module with a Sub Main() in it. But from form to form you would do the .Show/etc... Cool | :cool:

Cleako

JUNEYT20-Feb-07 11:01

JUNEYT

20-Feb-07 11:01

Cleoko gave you the right answer. A form resides inside an application. Actually it is a class. If your aim is to call another form while the first forms is displayed, you can create an instance for the second form. It is very simple as shown below. application.run statement is used to run another application what resides under the same or a different directory.

Dim 2ndForm as new Form2

2ndForm.show
'If you want to hide first form, use the followin statement.

1stForm.Hide

Journey

joining two tables together in vb.net

kendo1720-Feb-07 3:17

Re: joining two tables together in vb.net

20-Feb-07 3:17

I have 2 tables in database 1 called performance and 1 shows require to connect the 2 through primary key performanceNo and showNo in vb.net.

thanks before hand.

Marcus J. Smith20-Feb-07 3:33

20-Feb-07 3:33

Couple of links.

http://vb-helper.com/howto_net_datagrid_relations.html[^]
http://www.informit.com/guides/content.asp?g=dotnet&seqNum=321&rl=1[^]

Cleako

FileOpen/FileClose????

Marcus J. Smith20-Feb-07 3:07