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I populate a list box with files from a file search. Then I can select a file from the list box and open it with a certain program. If I select a second file from the list box and open it, it starts another instance of the program. These are text files I am opening in a text editor. What I want to do is if the text editor is already running just open the new file in the already opened program. The extensions can be anything so I cannot associate them to this file editor. (too numerous) I know how to find out if the program is running, just not how to add another file to it. Here is code that I have been using to find out if the program is open and if not start the file in the program. This works fine but what I want to do is instead of showing message box if the process is running, is open the file in it without staring another instance of it.
Dim ProcessIsRunning As Boolean = Process.GetProcessesByName("editcnc").Length > 0
If ProcessIsRunning = True Then
MessageBox.Show("EditCNC already Running")
Else
openf = """" & openf & """"
Process.Start(editFile.Text, openf)
End If
modified 22-Feb-18 15:55pm.
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You have a problem. Not every application can handle opening another document while it's already running, like Notepad can't do that.
Not every application exposes any kind of interface to be able to programatically support opening multiple documents. Word, Excel, and most other Office apps, supports doing this as they expose COM interfaces to be able to communicate with them. Most applications don't support this. You'd also have to write code specifically against every application you'd want to support. There is no such thing as a "one interface works with all" here.
Some applications may support opening other documents through command line arguments. Launch another copy of the application and it will automatically talk to the already running copy to tell it to open the new document. Not every application supports this and, again, there is no "one command line works for all apps" here either.
There is no way to support every app generically. The only workable solution you have is to simple launch the document you're trying to open. The application associated with that file extension will open the document however it is supported, either by launching another copy of the application or by telling the the already running copy of the app to open it.
YOU WILL HAVE NO CONTROL OVER HOW THIS PROCESS WORKS, NOR CAN YOU GET CONTROL OVER IT!
modified 23-Feb-18 8:04am.
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Thanks for your reply, Dave. The program I am working with, "EditCNC" does support opening multiple documents at one time. In my program I am giving the option to open the files with EditCNC, Word, or Wordpad. I am not as concerned about opening multiple files with Word or Wordpad, just with EditCNC. I am new at this but am wondering if you could elaborate more on the COM interface you had mentioned.
Thanks.
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You have to contact the vendor on that app and see if it even exposes a COM interface as most apps don't.
You can try looking in Visual Studio though to see if anything stands out. Start a new Console or Windows Forms application, go to your project in Solution Explorer and right-click References. Click Add Reference. In the dialog that shows up, click on the COM tab and start looking through the list for anything that might be related to EditCNC. Warning: The list is going to be quite long.
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Dave Kreskowiak wrote: Now every application exposes ...
"Not every application", surely? 
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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Whoops! Fixed. 
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Hi,
I would like to know how to read, modify and write an Excel file in a Windows form.
Does anyone has any experience and sample code?
I am using Visual Basic 2017.
Thanks!
Frank
modified 22-Feb-18 9:01am.
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There are the Microsoft.Office.Interop libraries for interacting with Office products, and lots of sample code on the net if you google it. Here[^] tells you how to add the Excel one to your project.
Note though that this is only a workable solution for Winforms - if you're writing Webforms, you'll need a third-party solution (which may be easier to work with anyway, if you or whoever you're working for can afford it - they're generally not cheap.)
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Thanks for your info!
I will look into it.
Frank
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Syncfusion provides a set of non-UI tools for this purpose. They have a Community version if you don't wish to spend thousands of dollars for the commercial version. You can create, read and write Excel and Word files and integrate it into a WinForms or WPF application. Bit of a learning curve, but it's a fairly powerful set of tools. Thorough documentation and responsive live help even with the free version. There also are 3 grid controls included if you wish to build your own Excel clone.
Syncfusion XlsIO[^]
Sometimes the true reward for completing a task is not the money, but instead the satisfaction of a job well done. But it's usually the money.
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Hello !
I'm using vb.net 2013
Is there any way to open a form full screen? ( I mean the same effect that I can have on youtube when choose to play full screen , or in games that can show full screen ) ?
Thank you !
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Sure, open a form with a windowstate of WS_MAXIMIZED and make it borderless. If you want to improve on youtube, you open your own desktop-object
Bastard Programmer from Hell 
If you can't read my code, try converting it here[^]
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Hello !
I'm using vb.net 2013 , sql server 2008 R2.
I'm using SMO to backup and restore databases.
The problem is that this working only on SQL server 2008R2.
If I try my application with other Sql server versions it doesn't work.
Is there any way to make it work with all sql server versions ?
Thank you !
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Different versions of Sql Server have their own respective SMO, as it is bound to the capabilities of that version. To "make it work" with all versions, you'd have to make a facade that loads the correct version of SMO and manipulates the target for you.
Still doesn't mean that you can restore a 2012 database on a 2008 server, so limits as described on MSDN still apply.
Bastard Programmer from Hell
If you can't read my code, try converting it here[^]
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And there is another way to do that , I mean without SMO ?
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Issue Sql-commands for what you want to achieve; the backup-command is supported by most versions of SQL Server.
Bastard Programmer from Hell
If you can't read my code, try converting it here[^]
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I've read somewhere that if I use SMO files from the latest SQL server version , these can work with lower versions too.
Is this true ?
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Yes
Bastard Programmer from Hell
If you can't read my code, try converting it here[^]
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Hello !
I'm using vb.net 2013 , SQL server 2008 R2 and entity Frameowrk 6.
I have a situation where on the database , I need to have a foreign key refer the primary key on the same Table.
Employe Table
------------
ID
Name
Position
Manager ID
ID is the primary key , Manager ID is the foreign key , and as the manager is also an employee on the same table , this foreign key refer to the primary key ID on the table employee. But several employees can have the same Manager ID.
I want to know if this is possible and safe to use on sql server and also to work with it on Entity Framework.
Thank you !
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desanti wrote:
I want to know if this is possible and safe to use on sql server and also to work with it on Entity Framework.
That's a rather common thing to do. Without knowing much EF, I'm going to say that it is possible and safe.
Bastard Programmer from Hell
If you can't read my code, try converting it here[^]
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A structure known as a pig's ear!
Recursive Relationships
=========================================================
I'm an optoholic - my glass is always half full of vodka.
=========================================================
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Hello !
On Visual studio 2017 , is there possible to use Entity framework 6 , with Database first ?
Because i can't find a way to start a such project.
Thank you !
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Google for "entity framework 6 database first tutorial". The version of Visual Studio does not matter.
Before you dive into a project using EF, Google for "entity framework database first vs code first", to understand what the differences and restrictions on what you can do are going to be for each method.
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Thank you !
I know how to use and work with Entity framework and EF6 with database first.
I want to use it as I've used on Visual studio 2013.
But on Visual studio 2017 , I can't find a way how to start a project with EF6 and Database first.
It seems that VS 2017 is using only Entity framework Core and dropped the support for EF6 ? Or i'm wrong ?
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