Re: MDI Problem - Visual Basic Discussion Boards

nitin_ion3-Nov-04 20:06

3-Nov-04 20:06

Hi,
In my project i have 4 forms the starting form is MDI Container.what i want to do is, to open a child form from another child form e.g. a search form opens another child form for the main MDI container. I have tried a lot of things but to no sucess. Help!
Thanks
Nitin

Re: MDI Problem

Mekong River3-Nov-04 20:54

Mekong River

3-Nov-04 20:54

Can you post the code that you face the problem on this forum?

A thousand mile of journey, begin with the first step.

APO-CEDC
Save Children Norway-Cambodia Office

Re: MDI Problem

nitin_ion3-Nov-04 21:56

nitin_ion

3-Nov-04 21:56

Dim ChildForm1 As frmChildForm = New frmChildform
Dim MDIForm as frmMDIForm = New frmMDIForm
ChildForm1.MdiParent = MDIForm
ChildForm1.Show()

The MDIForm is the main form and i am calling this code from another ChildForm but it's not working, instead it opens ChildForm1 as a new form with no MDIParent.Help!
Thanks.

Re: MDI Problem

Dave Kreskowiak4-Nov-04 3:49

Dave Kreskowiak

4-Nov-04 3:49

The problem is that your creating a new instance of your MDIParent form and passing that to the child. Instead, pass the MdiParent of the current child form to the new child form. (In a proper MDI application, all child form creation should be left up to the MDIParent, not it's child forms!)

Dim ChildForm1 As frmChildForm = New frmChildform
ChildForm1.MdiParent = Me.MdiParent
ChildForm1.Show()

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

Re: MDI Problem

nitin_ion4-Nov-04 16:47

nitin_ion

4-Nov-04 16:47

Thanks Dave I have tried ur code but the problem is still the same it is not opening as a child window.

Re: MDI Problem

Dave Kreskowiak5-Nov-04 2:49

Dave Kreskowiak

5-Nov-04 2:49

Like I said, it's better to have the child creation code in the Parent.

But, we'd have to see more of your code. There's something else you're doing/not doing that we can't see.

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

Re: MDI Problem

nitin_ion5-Nov-04 20:26

nitin_ion

5-Nov-04 20:26

Thanks Dave for working on my problem.

This is what i am writing in my MDI form after setting it IsMdiContainer property to true.

Dim ChildForm As frmFind = New ChildForm
ChildForm.MdiParent = Me
ChildForm.Show()

Rest U know what I am doing in child form.

Thanks a lot.

Re: MDI Problem

Dave Kreskowiak6-Nov-04 2:22

Dave Kreskowiak

6-Nov-04 2:22

The not what I was looking for...

What else is happening in your child form code, around the place where the new form is created? I'm looking for things like, are you closing the child form that creates your second child form?

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

Re: MDI Problem

nitin_ion7-Nov-04 23:50

nitin_ion

7-Nov-04 23:50

Yes I'm closing the childform which creates a new child form but only alter creating and showing the new childform.

Dim ChildForm As frmFind = New ChildForm
ChildForm.MdiParent = Me
ChildForm.Show
Me.Close()

Re: MDI Problem

Dave Kreskowiak8-Nov-04 2:48

Dave Kreskowiak

8-Nov-04 2:48

That's the problem! The old child form holds the reference that is keeping the new child form alive. Once the old child form is destroyed, any objects that it created are also destroyed! That's why I said leave the child form creation up to the parent and not another child!

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

Re: MDI Problem

nitin_ion8-Nov-04 23:50

nitin_ion

8-Nov-04 23:50

Problem is solved thanks

Re: MDI Problem

nitin_ion8-Nov-04 23:50

nitin_ion

8-Nov-04 23:50

Problem solved thanks

.NET Registered COM

Chris Quick3-Nov-04 17:32

Chris Quick

3-Nov-04 17:32

I'm looking to create a COM component to run on my Web App. The Web App is server ASP pages and needs to access a COM component for retrieving items from a database. The reason I'm considering COM is because I would like to use DB Connection Pooling to interact with SQL server. I know there is a way to register a .net assembly as a COM component. My question is, I would like to know if I will be able to access the COM using VBScript.

For example, can I use something like

Set PageRenderer = Server.CreateObject("MyCompany.PageRenderer")

and then call methods on it?

Thanks for any input!

Re: .NET Registered COM

Dave Kreskowiak4-Nov-04 1:03

Dave Kreskowiak

4-Nov-04 1:03

So long as the target machine has the appropriate version of the .NET Framework installed, this will work. Once the component is registered, it works just like any other COM component.

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

Delete all sub item in child table

Mekong River3-Nov-04 17:08

Mekong River

3-Nov-04 17:08

Hi, My database has two table:

1. tblMain<br />
2. tblChild

tblMain is the main table and tblChild is the child table which has relationship (one to many) from tblMain to tblChild.

In VB.Net I use COM ADO 2.0 to access my access database. In this project, one item in tblMain can have many item in tblChild. The problem that i face is I want to delete one item from tblChild, but it delete all item that relate to tblMain. Example: in tblMain I have the reocrd as befow.

SubjID (Primary key)    SubjName
s001                    Computer
s002                    Mathematic
s003                    Economic

and tblChild have the following field and data:

SubjID (Foreign Key)    FilePath
s001                    C:\VB.doc
s001                    C:\Doc\VBdotNet.doc
s002                    D:\Prog\Algo.txt
s003                    C:\Eco\SoutEas.doc
s003                    C:\Eco\Elect.txt
s003                    C:\Eco\Oil.doc

And then I want to delete

s003                    C:\Eco\Oil.doc

But I after I delete my tblChild table remain only:

SubjID (Foreign Key)    FilePath
s001                    C:\VB.doc
s001                    C:\Doc\VBdotNet.doc
s002                    D:\Prog\Algo.txt

The record:

s003                    C:\Eco\SoutEas.doc
s003                    C:\Eco\Elect.txt

Also delete too, I don't know why??? Can any one told me to solve this prblem... Cry | :((

A thousand mile of journey, begin with the first step.

APO-CEDC
Save Children Norway-Cambodia Office

Re: Delete all sub item in child table

Anonymous4-Nov-04 4:03

Anonymous

4-Nov-04 4:03

Probably your sql statement isn´t right.
For this case, the sql statement should be:

DELETE * FROM tblChild WHERE FilePath='C:\Eco\Oil.doc'

Re: Delete all sub item in child table

Mekong River4-Nov-04 13:45

Mekong River

4-Nov-04 13:45

Now I have an idea but did not try yet. I will do this:

DELETE * FROM tblChild WHERE tblChild.SubjID='s003' AND tblChild.FilePath='C:\Eco\Oil.doc'

A thousand mile of journey, begin with the first step.

APO-CEDC
Save Children Norway-Cambodia Office

Re: Delete all sub item in child table

Anonymous5-Nov-04 0:57

Anonymous

5-Nov-04 0:57

That´s right. But if you let me give you an advice: You could put an PK field in tblChild and work with that field. I don´t know if this would make things easier but...

Good luck.

Re: Delete all sub item in child table

Mekong River5-Nov-04 3:14

Mekong River

5-Nov-04 3:14

Thank you very much for your advice. May be I need to try with this way, I really worry because the deadline of my project is comming soon. Cry | :((

A thousand mile of journey, begin with the first step.

APO-CEDC
Save Children Norway-Cambodia Office

how to call datagrid_currentCellChanged event on a button Click

Jeevan anjna3-Nov-04 16:31

Jeevan anjna

3-Nov-04 16:31

I have a grid suppose it have Three row and one column
and three row have "Hi"
when I changed first row means Hi to "Hello"
and come on Second row then Grid_currentCellChanged Event fire its ok But the Problem is that

" when I changed Second row again "Hi to Hello
and withOut Any Other Click I click a button "Save"
And Again Fill The Datagrid Then InSecond row the Changes
no perform Even not in Data Base."

So what Should I do.

SoftWare Engineer

tic tac toe

Tow Jam3-Nov-04 15:52

Tow Jam

3-Nov-04 15:52

i've been trying to figure out how to make a tic tac toe game using control arrays , but no luck , it's not as easy it was in VB 6 . Please help me .

Re: tic tac toe

Dave Kreskowiak3-Nov-04 17:24

Dave Kreskowiak

3-Nov-04 17:24

Control Array's don't exist in the .NET Framework. But, they can be simulated. Check out Creating Control Arrays in Visual Basic .NET and Visual C# .NET[^] on MSDN.

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

open file *.*

pht99993-Nov-04 15:25

pht9999

3-Nov-04 15:25

Please help me! how to open file *.* Ex: file.pdf; file.doc... Thank U Rose | [Rose]

Re: open file *.*

Dave Kreskowiak3-Nov-04 17:22

Dave Kreskowiak

3-Nov-04 17:22

You're going to have to further explain what you mean by "opening file *.*"... Are you trying to launch the application that handles these files or what?

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

Re: open file *.*

Mekong River3-Nov-04 21:06

Mekong River

3-Nov-04 21:06

In this case you have to annalyse an extension of the file that you are open and write the code open it in the correct way. Example:

1. To open word document see this information.[^]
2. To open excel spread sheet see this information.[^]
3. To open acrobat read file (pdf) see this information.[^]
4. To open text file see this information.[^]
...
For more file support try to check website for more information.

A thousand mile of journey, begin with the first step.

APO-CEDC
Save Children Norway-Cambodia Office

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