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As a side note, adding a reference only works for COM and .NET .DLL's. It won't work for library .DLL's.
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I have a Pegasus ImageXview control in a panel. I would like to scroll up/down using the mousewheel. I can receive the wheel events, however I can't seem to move the scroll bar. From my reading, I thought AutoScrollPosition was supposed to be set, but I have had no sucess. Even tried hard coding it.
How does one scroll programmatically? How do you detect if you are at the top / bottom of the form?
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first: a panel has a property 'autoscroll' set this to true maybe it will solve you're problem
second: there are 2 controls in vb.net you should look at: hscrollbar and vscrollbar maybe they can be of help
if not
three: you can try to propramme it by set the panels top bye -= 5 and height bye +=5 or something everytime there is a scroll event but this is far from the best way (and probably has al sorts of problems with it that I can't come up with right now)
so my advice try 1 then 2 and if you have ecausted every option go to 3 (only when absalutly no other way)
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The problem was Pegasus - they have the AutoScrollPosition property - but it isn't used. They use their own property called ScrollPosition, setting that works. Go figure?
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yeah that happens I'm currently working with datawindows control and the calender control of codejock and I ran into several of these 'wtf' moments 
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How can i call a form to show only one at a time or i mean not more than one instant of form without committing this error:
SystenNullReferenceException: object reference not set to an instance of an object.
**************************************************************
here's my form1 which is default mdiParent frmMain.vb:
Note: I just omitted some sub,functions and events code to minimize this code
**************************************************************************
Imports ADODB
Imports System.Diagnostics
-Public Class frmEmployeeProfile
Inherits System.Windows.Forms.Form
+ Windows Designer generated code
'there are some subs,functions and events i just omitted to minimize this code
- Private Sub menuEmployee_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles menuEmployee.Click
If frmEmployee Is Nothing Then
frmEmployee.Focus() 'My error occur here!
Else
frmEmployee = New frmEmployeeProfile
With frmEmployee
.MdiParent = Me.MdiParent
.ShowDialog()
End With
End If
End Sub
End Class
**************************************************************
here's my form2 which is non mdiParent frmEmployeeProfile.vb:
**************************************************************
Imports ADODB
Imports System.Diagnostics
-Public Class frmEmployeeProfile
Inherits System.Windows.Forms.Form
+ Windows Designer generated code
'there are some subs,functions and events i just omitted to minimize this code
End Class
*******************************
and this is my vb code in module.vb
***************************************
Imports System.Diagnostics
-Module mdlModule
Public frmParent As New frmMain
Public frmEmployee As frmEmployeeProfile
'there are some subs,functions and events i just omitted to minimize this code
End Module
*********************************
Please Help!!...
Please understand im a newbie in VB.NET
and this is my 1st question posting.. ahehe
Any reply shall be appreciated...
Thanks! 
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BlueCodeDiggerzzz wrote: If frmEmployee Is Nothing Then
frmEmployee.Focus() 'My error occur here!
Else
frmEmployee = New frmEmployeeProfile
...
End If
You figured which line is wrong, but you still need help ?
how can you call a method for a null reference ???
and replace it by something new when it is not Nothing?
Luc Pattyn [Forum Guidelines] [My Articles]
this weeks tips:
- make Visual display line numbers: Tools/Options/TextEditor/...
- show exceptions with ToString() to see all information
- before you ask a question here, search CodeProject, then Google
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BlueCodeDiggerzzz wrote:
If frmEmployee Is Nothing Then
seem like this line is wrong. you can't access any properties, methods (eg: Focus() ) or events if that control is Nothing.
So, maybe. it should be something like that.
If frmEmployee IsNot Nothing Then<br />
<br />
frmEmployee.Focus() 'My error occur here!<br />
<br />
Else<br />
<br />
frmEmployee = New frmEmployeeProfile<br />
<br />
With frmEmployee<br />
<br />
.MdiParent = Me.MdiParent<br />
.ShowDialog()<br />
<br />
End With<br />
<br />
End If<br />
<br />
Note: IsNot is VB.NET 2005 code. If you are using VS 2003 then it should be like that If Not frmEmployee Is Nothing Then
Hope it helps.
Thanks and Regards,
Michael Sync ( Blog: http://michaelsync.net)
If you want to thank me for my help, please vote my message by clicking one of numbers beside "Rate this message". Why vote? Plz Read it here. Thank you.
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Michael Sync wrote: Note: IsNot is VB.NET 2005 code. If you are using VS 2003 then it should be like that If Not frmEmployee Is Nothing Then
Wow - VB can't even standardise on this sort of stuff between versions ?
Christian Graus - Microsoft MVP - C++
"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )
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Christian Graus wrote:
Wow - VB can't even standardise on this sort of stuff between versions ?
Yeah. IsNot is new keyword for VS.NET 2005.. I think that this keyword is pretty cool. Even thought we can use IsNothing() or Not *** Is Nothing, I prefer to use IsNot that makes the code looks better.
Thanks and Regards,
Michael Sync ( Blog: http://michaelsync.net)
If you want to thank me for my help, please vote my message by clicking one of numbers beside "Rate this message". Why vote? Plz Read it here. Thank you.
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For me personally, I prefer !
Christian Graus - Microsoft MVP - C++
"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )
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and !VB!
Luc Pattyn [Forum Guidelines] [My Articles]
this weeks tips:
- make Visual display line numbers: Tools/Options/TextEditor/...
- show exceptions with ToString() to see all information
- before you ask a question here, search CodeProject, then Google
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Luc Pattyn wrote: and !VB!
Yeah.
Thanks and Regards,
Michael Sync ( Blog: http://michaelsync.net)
If you want to thank me for my help, please vote my message by clicking one of numbers beside "Rate this message". Why vote? Plz Read it here. Thank you.
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i am new to visual basic and i have a task to design a programme using visual basic for excel to import the raw data and sort it accordingly. i also have to decode that raw data into meaningful data. I hope I can get some guide to finished my task..thank you for all the help.
miss_naz.
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You should look at using OLEDB Data Connections - much quicker than using reference to excel Application object.
Set up you connection something like this:
Dim cn As New OleDbConnection
cn = New OleDbConnection
cn.ConnectionString = "Provider=Microsoft.JET.OLEDB.4.0;" & _
"Data Source=" & filepath & ";" & _
"Extended Properties='Excel 8.0;HDR=YES;'"
- Where filepath is your Excel File and Excel x.x is the version of Excel on your system.
(You will need to add a reference to the Microsoft Excell Library)
Once this is set up you can write basic queries on the data. Use a OleDbCommand and OleDbDataAdapter and DataSet etc.to catch the data from Excel.
Make sure that your Excel Worksheets are "Flat",
IE: One Header Row and similar data in each column. Try to stick to same datatypes in each column.
There is quite a lot of information out there - Search for "Excel, OleDeb"
Hope this helps
Kiwi Andy
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How to show a message box which close after specified time?
I know that this can be done by adding another form with the text want to show as messagebox.I tried with a new form by using the following line
dim msgform as new form
msgform.showdialog
it shows the form but did not execute the next line.
Ejaz
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ejaz_pk wrote: msgform.showdialog
This shows a modal dialog, your next line won't execute until the form is closed. To do this, you need to write a form which has a timer internally, and closes itself.
Christian Graus - Microsoft MVP - C++
"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )
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Is this possible to resize the column width according to the column text.
I means If user double click on the header to adjust the width of the single column it should adjust all the columns width just like excel?
Ejaz
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My program watches for two different files to change. txt file and mdb table. Here is my initial code.
<pre><code>Dim watcher As New FileSystemWatcher
Dim tablewatcher As New FileSystemWatcher
watcher.Path = "C:\Documents and Settings\bin"
tablewatcher.Path = "C:\Documents and Settings\bin"
tablewatcher.NotifyFilter = (NotifyFilters.LastAccess Or NotifyFilters.LastWrite Or NotifyFilters.FileName Or NotifyFilters.DirectoryName Or NotifyFilters.Size)
watcher.Filter = "*.mdb"
tablewatcher.NotifyFilter = (NotifyFilters.LastAccess Or NotifyFilters.LastWrite Or NotifyFilters.FileName Or NotifyFilters.DirectoryName Or NotifyFilters.Size)
tablewatcher.Filter = ".txt"
' Add event handlers.
AddHandler tablewatcher.Changed, AddressOf OnChanged
AddHandler watcher.Changed, AddressOf OnChanged
' Begin watching.
tablewatcher.EnableRaisingEvents = True
watcher.EnableRaisingEvents = True</code>
My question is, is there a way to tell which file was changed? I have the following Onchanged method that I want to do one thing for one Onchanged and something else for a different Onchanged.
Private Sub OnChanged(ByVal source As Object, ByVal e As FileSystemEventArgs)
end Sub
How can I check to see which Onchanged happened? Or can I?
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Hi Cory,
if you want completely different actions for both, why bother having only one
handler ? Just create two different handlers, and adjust the AddHandler lines.
if you want nearly the same handling, have one handler and look at the source
Object, I expect you can cast it to a FileWatcher, then compare to one of the
two FSW you instantiated (or you could set up a Hashtable or Dictionary to
associate some object to each of them).
Luc Pattyn [Forum Guidelines] [My Articles]
this weeks tips:
- make Visual display line numbers: Tools/Options/TextEditor/...
- show exceptions with ToString() to see all information
- before you ask a question here, search CodeProject, then Google
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Is this possible to show an image in the subitem of the listview instead of showing that in the first column of the listview?
Thanks in advance
Ejaz
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If it is, it would involve owner drawing ( that is, writing your own code to draw the control ). By default, no.
Christian Graus - Microsoft MVP - C++
"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )
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Hi,
I need to add an event to when a user double clicks on the webbrowser. I thought of adding it using the AttachEventHandler onto the webbrowser.document object but am not sure about the syntax. I would appreciate any help in this regard.
Thanks alot!
Ahmad
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Can you please assist me with the coding of MediaPlayer or MS-Paint using VB.net. It is part of my assignment I don't even know where to start.
I'll appreciate your assistant
Thank you.
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You really need to try something, then if you run into a problem post your specific problem. In general we try not to do peoples homework for them.
Ben
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