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Investigate this page for shutdown/restarting...
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Hi
I created these classes :
MustInherit Class DataTableManager
Inherits UserControl
End Class
Class OrderManager
Inherits DataTableManager
End Class
When I open OrderManager in designer , I get : Warning - The designer must create an instance of type 'DataTableManager' but it cannot because the type is declared as abstract.
Is there any way to open OrderManager in designer ?
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Nope. If there is an abstract class in the inheritance chain, it won't work.
The designer cal only work with concrete classes.
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sometimes the issue is the datatablemanager wasn't compiled. we have class that we call "formbase". all of our forms inherit from it. sometimes when that class is changed or something related to it changes, I have to compile the project that class is in then my form that inherits from it will show. a control would follow under the same behavior...
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Hi,
i am developing a project(vb.net 2005) which acts like an Office Viewer. That means that on a form, the user will be able to see or change page/worksheet etc, of a Word or Excel or Powerpoint file(including Office 2007). Is there any idea how to do this?
ninkk
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Man you're impatient.
The problem with doing this is that you have to use Word, PowerPoint, Excel, Access, all that junk installed, so it really makes your app pointless.
Besides, Microsoft already has smaller view applications[^] for all those file types.
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Ok, but Microsoft viewers are stand alone application. What i need is to be able to view office files within a .net project. Maybe there exists a component control, and after you drag and drop it on the form, to give filename and to see the office files(something from microsoft or 3rd party)? For example, in order to see Pdf files, you can install Adobe Reader and add in toolbox Adobe Pdf Reader from COM Components. Is there any to do this for .doc, .docx, ppt, etc... ????
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Maybe this[^]. The only problem is that it's $500 for a single developer license and $999 for distribution license where you can actually sell your app with the component in it. It's the only one I know of. I don't recommend it because it's so bloody expensive.
Other than that, you can use the Office Primary Interop Assemblies to use Office apps inside your app. I don't do Office Interop so my experience with it is very limited.
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is there any diffrence between procedure and function?
Soniagupta1@yahoo.co.in
Yahoo Messenger Id = soniagupta1
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Yes a Sub doesn't return a value and a Function returns a value.
Ben
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u mean procedure and sub are synonyms?
Soniagupta1@yahoo.co.in
Yahoo Messenger Id = soniagupta1
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If you are writing vb.net code you only have sub and function.
Ben
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Yeap,
Procedures executes the commands and returns nothing, on the other hand, function should always return something(integer or string, etc), to the point that they were called from.
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better to say is that as we have "void" return type of a function i.e. a function that doesn't return a value in many languages like C++, C# or Java in visual basic we have sub for this purpose. i.e. sub is a function with void void return type 
Salman Sheikh
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Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
End Sub
out of the above mentioned
i think
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs)
End Sub
is the handler
and Handles MyBase.Load is an event
Am i right?
Soniagupta1@yahoo.co.in
Yahoo Messenger Id = soniagupta1
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Yes, I think you are right.
Parwej Ahamad
g.parwez@gmail.com
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handles mybase.load is indeed the event this sub handles
the event passes 2 parameters to the sub therefor you need the
Sonia Gupta wrote: Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs)
End Sub
so you could call it the handler
If my help was helpfull let me know, if not let me know why.
The only way we learn is by making mistaks.
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1 - buy a book, please
2 - learn how to format your questons, 'please help' is just painful.
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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event is an event and handler is a routine or procedure which is automatically called when that event occurs.
Handles MyBase.Load means we specify a handler for the Load Event
Addhandler does the same thing
both register a procedure with an event so both are equalent
Salman Sheikh
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hi all,
i write some code at timer tick event .this codes work well . but when we run database query(database is located on net) then during this duration timer tick event not fired.However after completion of query( when i get result from query) timer tick event works well.
any body have some idea about this problem ?
Please guide me
Rupesh Kumar Swami
Software Engineer,
Integrated Solution,
Bikaner (India)
My Company
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Hi,
it depends on circumstances. This is one way to get what you describe:
- use a Windows.Forms.Timer (which ticks on the GUI thread);
- perform the database access (or some other long-winding operation) on the GUI thread,
e.g. in a button Click handler.
Now while the long operation is going on the entire GUI is frozen, as well as the Forms timer,
so nothing happens until the long operation has finished.
The right approach to remedy this is to use a separate thread for all long operations
(and to use InvokeRequired and Invoke if they need to access GUI parts).
Luc Pattyn [Forum Guidelines] [My Articles]
this months tips:
- use PRE tags to preserve formatting when showing multi-line code snippets
- before you ask a question here, search CodeProject, then Google
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Hey guys,
I'm trying to get the name of the db column that the current active control is bound to. I need it to do sorting on current control (textbox/combobox/checkbox).
I cant find a property that can tell me this. Can someone fill in the blanks:
Me.XrfEventTypeBindingSource.Sort = Me.ActiveControl.????????? + " ASC"
Anybody know?
Thanx
Ed
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ActiveControl returns a Control object, which has a DataBinding collection. Look in that collection for a Binding object, which will have a BindingMemberInfo property, which has the column information in it.
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Thanx a lot! I couldnt for the life of me find it.
So to fill in my previous blanks, might help someone else in future:
Me.XrfEventTypeBindingSource.Sort = Me.ActiveControl.DataBindings(0).BindingMemberInfo.BindingMember + " ASC"
Cheers
Ed
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