The Wiert Corner – irregular stream of stuff

Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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Archive for the ‘VB.NET’ Category

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WinForms UserControl and Visual Studio 2010 debugging – The process cannot access the file … because it is being used by another process – Stack Overflow

Posted by jpluimers on 2011/12/13

When doing WinForms development in Visual Studio 2010 (including SP1), be aware of a bug with UserControls that hamper debugging; sometimes you get an error like this:

Error 9 Unable to copy file "obj\x86\Debug\MyProject.exe" to "bin\Debug\MyProject.exe". The process cannot access the file 'bin\Debug\MyProject.exe' because it is being used by another process.

When using SysInternals’ Process Explorer to see which process has handles open to MyProject, you will see that devenv.exe (The Visual Studio IDE) is the culprit: sometimes it has a lot of handles open.

The workaround is simple: close all UserControls before debugging your WinForms application.

A real pity, as UserControls are a very useful feature when developing software (many platforms use the same paradigm, .NET certainly wasn’t the first to introduce it, and it is available in for instance WPF as well).

Note that there are other causes of the same error message, but for me this was the issue.

–jeroen

Via: visual studio 2010 – VisualStudio2010 Debugging – The process cannot access the file … because it is being used by another process – Stack Overflow.

Posted in .NET, C#, Development, Software Development, VB.NET, Visual Studio 2010, Visual Studio and tools | 2 Comments »

c# – Panel.Dock Fill ignoring other Panel.Dock setting – Stack Overflow

Posted by jpluimers on 2011/11/08

Every once in a a while I do WinForms development. On the .NET platform it still is the best way to create simple business applications that just, well: work.

WinForms apps are not fancy, but the actual users don’t care much, as long as they can their daily work done. They love fanciness of their mobile devices, but for stuff they use 8 hours a day, they just want something that works quickly, well and easily. So WinForms for a baseline is good.

WinForms historically has had two ways of automatically: Anchors and Dock (.NET 2 introduced another way using FlowLayoutPanel and TableLayoutPanel, but often they make things more complicated than needed).

One of the pitfalls of Docking is when you set Dock to Fill. Sometimes the affected control will be too large.
Every time that happens, I am baffled, as .NET is the only platform with that behaviour; I use other platforms too, and they don’t have this docking peculiarity (of course the have others, that’s the fun of using multiple platforms <g>).

The solution is simple:

  1. Right click on the control that misbehaves
  2. Choose “Bring to Front”
Done :)

–jeroen

Via: c# – Panel.Dock Fill ignoring other Panel.Dock setting – Stack Overflow.

Posted in .NET, C#, C# 2.0, C# 3.0, C# 4.0, Development, Software Development, VB.NET, WinForms | 2 Comments »

Using InputBox in C#

Posted by jpluimers on 2011/11/03

Sometimes you just want to ask a user for a simple string of input.

The InputBox function is an easy way to do do this. It has a tiny issue with the icon (it uses the one that belongs to the application installation, not the icon in the project properties).
InputBox has been part of Visual Basic since the 90s. And it is very easy to use from C# and other .NET languages:

  1. Add the Microsoft.VisualBasic assembly (which has been part of the .NET FrameWork since it first got released)  to your solution
  2. Make a call like
    Microst.VisualBasic.Interaction.InputBox("Did you know your question goes here?","Title","Default Text");

Sometimes you have to look a bit further than your regular toolbox for simple solutions.
I should dig up my 2006 session on the My Object in Visual Basic:  that is also very easy to use in C#.

–jeroen

via: Input Message Box in C#?.

Posted in .NET, C#, C# 2.0, C# 3.0, C# 4.0, Development, Software Development, VB.NET, VBS | Leave a Comment »

Ideone.com | Online IDE & Debugging Tool >> C/C++, Java, PHP, Python, Perl and 40+ compilers and intepreters

Posted by jpluimers on 2011/03/18

Really cool stuff; dozens of computer languages are supported, including C# and VB.NET (both on Mono) and a few Pascal flavours.

Briefly about ideone

ideone.com is a… pastebin. But a pastebin like no other on the Internet. More accurate expression would be online mini IDE and debugging tool.

Ideone is an Italian word for great ideas – because ideone.com is a place where your greatest ideas can spring to life.

ideone.com is designed mostly for programmers (but, of course, common plain text can also be uploaded). You can use it to:

share your code (that’s obvious – it is a pastebin, isn’t it? :)) in a neat way,

run your code on server side in more than 40 programming languages (number still growing)

and do it all with your own input data!

ideone.com also provides free Ideone API which is availabe as a webservice. It’s functionality allows you to build your own ideone-like service!

for logged in users Ideone offers possibility to manage their codes, publish multiple submissions at one go, and more.

All codes can be accessed through convenient hash links. Source code pages provide information about the code and its execution: memory usage, execution time, language and compiler version, code itself, input uploaded by the user, output generated by the program and error messages from compilers and interpreters.

–jeroen

via Ideone.com | Online IDE & Debugging Tool >> C/C++, Java, PHP, Python, Perl and 40+ compilers and intepreters.

Posted in .NET, C#, Delphi, Development, Software Development, VB.NET | 4 Comments »

Exception Filter – VB.NET supports this, but not C#, so write a VB.NET wrapper to expose it to C#

Posted by jpluimers on 2011/02/24

Often I explain to people that there are a lot of .NET languages, because the .NET IL is rich, so the individual languages can focus on the IL pieces they do best.

This also means, that most languages have some support for specific pieces of IL that other languages do not have support for.

The IL Exception Filter feature is one such thing. It is supported by for instance VB.NET but not by C# as Junfeng Zhang explains:

C# does not support exception filter. However, VB and IL support it. To add exception filter to C#, we can build a function in VB or IL, then call it in C#.

Read his full article for the complete code.

–jeroen

via: Exception Filter – Junfeng Zhang’s Windows Programming Notes – Site Home – MSDN Blogs.

Posted in .NET, C#, C# 2.0, C# 3.0, C# 4.0, Development, Software Development, VB.NET | Leave a Comment »

Duh: projects of non-installed identities won’t load in VS. Learned: always install your VM yourself

Posted by jpluimers on 2011/02/23

For a project, I got a preconfigured VM for a client.

Certain projects they used gave this message:

—————————
Microsoft Visual Studio
—————————
The selected file cannot be opened as a solution or project. Please select a solution file or a project file.
—————————
OK
—————————

It appeared the didn’t do a full Visual Studio installation, so certain project types didn’t load.

This case it was Visual Studio 2008 and VBPROJ types, as Visual Basic .NET is way easier to do Office automation than C#.

In C#, you need truckloads of Type.Missing, which you do not need in VB.NET; Visual Studio 2010 made this easier, but you still often need them.

Lesson learned: always build all projects when you get a development VM, and prefer to install the VM yourself.

–jeroen

Posted in .NET, C#, Development, Software Development, VB.NET | Leave a Comment »

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