MDI Child Firing Wrong Event - Visual Basic Discussion Boards

Hi,
I am using VisualBasicExpress Edition, In my VB.NET Win forms application I declared textbox as Shared in order to access it from other Forms and am getting this warining upon building my application.

-------------------------------------------------------------------------
Access of shared member, constant member, enum member or nested type thr
ough an instance; qualifying expression will not be evaluated.
-------------------------------------------------------------------------

My Code
-------------------------------------------------------------------------
Partial Class frmMain
Inherits System.Windows.Forms.Form
Public Shared WithEvents txtNameAs System.Windows.Forms.TextBox
Me.txtName = New System.Windows.Forms.TextBox 'warning on this line
Me.Controls.Add(Me.txtName) 'warning on this line
End Class
-------------------------------------------------------------------------

How can I avoid these warnings?

Thanks in advance
Sujan

.Net Programmer, Software Engineer

You can't use the "Me" keyword to access shared members.
If a member is declared as shared then it does not belong to any instanc.
SImply refrence it by it's name...

--------------------------------------------------------
Q:What does the derived class in C# tell to it's parent?
A:All your base are belong to us!

Hi,

I have a CAB file which contains a dll file...it is present in the web server.The downloaded from the users PC get registered Automatically.

Now I have modified the DLL code...made a new dll(same name) ,made one new cab file and want to replace with the old CAB file in the server.

shall I make the dll with different name and make the new CAB file

thanks bye

Paritosh

hi
I had downloaded a dll from web and I want to unregister it.
I didn't found in sysyem32 folder..also regsvr32 /u "dllname" is not working.

That dll is present in c:\winnt\Downloaded Program Files

So can I delete it ??or tell me the process to unregister. Smile | :)

thanks

Paritosh

I fail to see what this has to do with VB.NET, but...

To unregister the .DLL, if it has such a capability, try supplying the full path to the .DLL to REGSVR32:

regsvr32 /u "C:\documents and settings\someone\somepath\dllname.dll"

If it comes back and says that the "DLLUnregisterServer entry point was not found", then you could just delete the file.

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

hi i built a treeview with data binding that reads the nodes and add it to the tree by Recursion and i took the code from this web site (FillTree) now i want to select a node by its text not the index couse i cant know the index of the nodes becouse its un limited tree plz i need a help and thx

HADEEL BARAKAT

You'll have to enumerate through all the treenodes and their child nodes collections to find the Text your looking for. Just write a small little method that calls itself recusrively to find the node and select it.

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

Environment
---------------
Visual Studio.NET 2003 Version 7.1.3088
.NET Framework 1.1 Version 1.1.4322 SP1
XP Professional 5.1.2600 SP2 Build 2600

Problem Description
-----------------------

I have an mdi parent form.
When it opens it creates 2 instances of the same mdi child form.
The mdi child form contains a textbox and a button.

In the keydown event of the textbox I trap the enter key and display the
contents of the textbox.
In the button click event I display a message box "Click".

When the application runs the 2 child forms are created and the second child
form has focus.
Using the mouse set focus on the textbox and press enter. The message is
displayed as expected.

Now use the mouse to set focus on the first child forms textbox and press
enter.
This time the button click event fires !!

Next set focus on child 2 textbox and press enter - this again works ok.
Finally return to child1 and press enter in the textbox - this now works and
displays the correct message.

If you take the button off the child form the problem doesn't occurr. Also
when both textboxes are working correctly it breaks again if you click the
button, select the other child form and then return to the original child
form.

I have included the source for a test app using VB.NET but the same problem occurs when using C#.

Looks like a bug to me but I would be interested to know if anyone else has
experienced this problem or know how to prevent it from hapenning ?

--------------------------------------------------------------------
Source Code
--------------------------------------------------------------------
MDI Parent Form
--------------------------------------------------------------------

Public Class frmMain
Inherits System.Windows.Forms.Form

#Region " Windows Form Designer generated code "

Public Sub New()
MyBase.New()

'This call is required by the Windows Form Designer.
InitializeComponent()

'Add any initialization after the InitializeComponent() call

End Sub

'Form overrides dispose to clean up the component list.
Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
If disposing Then
If Not (components Is Nothing) Then
components.Dispose()
End If
End If
MyBase.Dispose(disposing)
End Sub

'Required by the Windows Form Designer
Private components As System.ComponentModel.IContainer

'NOTE: The following procedure is required by the Windows Form Designer
'It can be modified using the Windows Form Designer.
'Do not modify it using the code editor.
<system.diagnostics.debuggerstepthrough()> Private Sub
InitializeComponent()
'
'frmMain
'
Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
Me.ClientSize = New System.Drawing.Size(718, 350)
Me.IsMdiContainer = True
Me.Name = "frmMain"
Me.Text = "frmMain"

End Sub

#End Region

Private Sub frmMain_Load(ByVal sender As Object, ByVal e As
System.EventArgs) Handles MyBase.Load

'Create 2 child forms at startup...
Dim frm1 As New frmChild
With frm1
.MdiParent = Me
.TextBox1.Text = "CHILD1"
.Show()
End With

Dim frm2 As New frmChild
With frm2
.MdiParent = Me
.TextBox1.Text = "CHILD2"
.Show()
.Left = frm1.Width + 50
.Top = frm1.Top
End With

End Sub

End Class

--------------------------------------------------------------------
MDI Child Form
--------------------------------------------------------------------
Public Class frmChild
Inherits System.Windows.Forms.Form

#Region " Windows Form Designer generated code "

Public Sub New()
MyBase.New()

'This call is required by the Windows Form Designer.
InitializeComponent()

'Add any initialization after the InitializeComponent() call

End Sub

'Form overrides dispose to clean up the component list.
Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
If disposing Then
If Not (components Is Nothing) Then
components.Dispose()
End If
End If
MyBase.Dispose(disposing)
End Sub

'Required by the Windows Form Designer
Private components As System.ComponentModel.IContainer

'NOTE: The following procedure is required by the Windows Form Designer
'It can be modified using the Windows Form Designer.
'Do not modify it using the code editor.
Friend WithEvents Button1 As System.Windows.Forms.Button
Friend WithEvents TextBox1 As System.Windows.Forms.TextBox
<system.diagnostics.debuggerstepthrough()> Private Sub
InitializeComponent()
Me.Button1 = New System.Windows.Forms.Button
Me.TextBox1 = New System.Windows.Forms.TextBox
Me.SuspendLayout()
'
'Button1
'
Me.Button1.Location = New System.Drawing.Point(21, 48)
Me.Button1.Name = "Button1"
Me.Button1.TabIndex = 0
'
'TextBox1
'
Me.TextBox1.Location = New System.Drawing.Point(9, 12)
Me.TextBox1.Name = "TextBox1"
Me.TextBox1.TabIndex = 1
Me.TextBox1.Text = ""
'
'frmChild
'
Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
Me.ClientSize = New System.Drawing.Size(127, 86)
Me.Controls.Add(Me.TextBox1)
Me.Controls.Add(Me.Button1)
Me.Name = "frmChild"
Me.Text = "frmChild"
Me.ResumeLayout(False)

End Sub

#End Region

Private Sub Button1_Click(ByVal sender As Object, ByVal e As
System.EventArgs) Handles Button1.Click

MsgBox("Click")

End Sub

Private Sub TextBox1_KeyDown(ByVal sender As Object, ByVal e As
System.Windows.Forms.KeyEventArgs) Handles TextBox1.KeyDown

If e.KeyCode = Keys.Enter Then
MsgBox(TextBox1.Text)
End If

End Sub
End Class

If I remember correctly, the first click will set the focus to the new form, the second click will actually give the focus to the control on it.

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

Yes - thats right but when I run this test app I can click as many times as i like on the form to give it focus but the button_click event always fires instead of the textbox_keydown event when I press enter in the textbox.

Also - the fact that I am trapping the enter key press is not important - it behaves the same when trapping any other key so I don't think that accept button behaviour is important here.

Once in this state the opnly way to recover the correct events firing is to move focus to a different child form and then move focus back. At this point everything is magically ok again until you perform the following steps again

click the button on child1 and say ok to the 'click' message
move focus to child2 (click the window handle for example)
move focus back to child1 (click anywhere on the form)
give focus to the textbox on child 1 and press enter (you should see the contents of the textbox displayed in a messagebox but instead you see the click message meaning that the button_click event fired when the textbox_keydown event should have fired.)

This happens every time i run this app and does the same thing when written in C#.

I tested your app in VB.Net 2005, I didn’t find anything wrong, but when I set to child form’s AcceptButton property to Button1 your problem occurred.

Chatura from Pearl of the Indian Ocean.

Thanks for checking but I am definitely getting this problem every time i run the app (unless i've lost it completely !!).
I'm using the 2003 version of VS.NET so it is possible it has been fixed in your version.

I'll try get hold of 2005 to test it.

Thanks again...

Ok -I have tested this using VS.NET 2005 and the problem doesn't happen. I guess this is a bug in the Windows Forms dll of the .NET framework v1.

Was looking for a good reason to upgrade so this will do.

Thanks for the help :¬)

Hello all,
I m new to the VB.NET WEB Application. I just wanna know a simple thing that how to open a WEB page from another web page? Which is that Page's property which i will have to use to link it to other page?

Thanks for your help....
Rohit.P

First: this should be in the ASP.NET section.
Second: define what you mean by open. This can be interpreted in various ways...

--------------------------------------------------------
Q:What does the derived class in C# tell to it's parent?
A:All your base are belong to us!

as i understand your question and answer shoukld be this.

in your webform1 (Default.aspx) drag and drop one control (example button) and on click of contril write code below

Response.Redirect("Default2.aspx")

_____________________

Proud to be Albanian
_____________________

Hi Guys,

I'm trying to develop a simple pocket pc app and want to use an xml file to store the data of my custom settings class.

I can't find a way to use the built-in xml functionality of vs2005. I can use system.xml etc in a normal (ie desktop) app but mobile is being a pig.

Is the xml functionality at all supported in vs2005 mobile sdk?

Thanking in advance for your time

PS: Aplgz if this is a dumb qstn! Unsure | :~

This was a dumb qstn!!! Blush | :O

The damn reference to system.xml was not set.

My aplgz!

business intelligence project type is missing in vs 2003.How do i get it

Install VS 2005 and SQL Server 2005 - gotta go to 2005 sometime.

...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 Smile | :)

(Translation: I'll show you the way, but not write the code for you.)

Hi there ,
I have just joined this forum . I want to access the serial and parallel
port through Visual Basic . Where can i get the free software to do that
and the respective drivers (in case needed).

Thanx a lot for ur help

Welcome to The Code Project.

Depends which version of VB you are using. If VB 6.0 you'll need extra bits. If VB .NET 2005 (.NET 2.0) I believe that there is inbuilt support for those ports.

In any case, there is a whole lot of info on The Code Project. Just search for parallel port or serial port articles (Search function at top of page). That'll reveal many good articles and "how-to's".

...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 Smile | :)

(Translation: I'll show you the way, but not write the code for you.)

Hi there,

I want to load the input xml,xsl and the transformed xml while loading the project. for example in any of the java application we store them as project files, can we do the same thing in vb.net also????
Thanks in advance..

Bharath.s

You want to make the xml/xsl part of your project file ? You can do that if you want, but I don't see any reason to, unless of course you want to embedd them in the exe. In that case, just add to the project, and then change their type to 'embedded resource'.

Christian Graus - Microsoft MVP - C++

My applcation is selecting a file on a list box.
When click the file, the image file will display in a picture box.
The type of image maybe .jpg, .bmp, .png, .tif.
The size of the image around 2000*2000
How can they use me 100MB memory to render each time?
What I do is just image.fromfile(filePath)
How to improve the memory usage?