Using C# class in VB.NET website - c#

I've a C# class with CorePoll namespace, I compiled it to .DLL file and put it inside bin folder of website. But I cannot use it. Imports CorePoll returns Could not load file or assembly 'CorePoll' or one of its dependencies. An attempt was made to load a program with an incorrect format.
It's my class file in C# http://pastebin.com/JkdrnXyT

The message An attempt was made to load a program with an incorrect format., typically comes from mixing 64/32 bit environments. When you build your .DLL, make sure to select Any CPU as the Target CPU int the build settings. That way, the DLL should work no matter if the website is running 32 or 64 bit. But be aware, the message also states Could not load file or assembly 'CorePoll' or one of its dependencies., meaning that if you've referenced other libraries in your DLL, they could be failing to load as well.
Edit: After looking at the documentation, another potential cause of this exception is mixing projects built with different versions of the .Net Framework. Is this possibly causing your error?
Components have been created using different versions of the .NET Framework. Typically, this exception occurs when an application or component that was developed using the .NET Framework 1.0 or the .NET Framework 1.1 attempts to load an assembly that was developed using the .NET Framework 2.0 SP1 or later, or when an application that was developed using the .NET Framework 2.0 SP1 or .NET Framework 3.5 attempts to load an assembly that was developed using the .NET Framework 4. The BadImageFormatException may be reported as a compile-time error, or the exception may be thrown at run time.

None of answers helped me, I converted the C# code to VB.NET and used it with no problem, thanks for your time.

Related

System.BadImageFormatException: 'Could not load file or assembly' - C# / C++

I try to be as detailed as possible in explaining our situation, premising that we made several attempts in relation to other similar situations found on stackoverflow. Specifically, we have a project consisting of many libraries in c# that has been updated from net 4.7 to asp.netcore 6.0. Within the project there is also a library of classes in c++. This library generates a dll that is used within one of the projects c#. The project in c++ has not been updated, but we simply went to vary the target framework from net 4.7 to netcore 6.0 (and also we changed clr to clr:netcore) as explained in the Microsost guide for porting hybrid projects in C# and C++. All the project builds correctly but when the debugging of the webapp in C# referencing the dll in C++ I get the following error:
System.BadImageFormatException: 'Could not load file or assembly 'Tradante.MT4.Wrapper, Version=1.0.8369.22669, Culture=neutral, PublicKeyToken=null'. Format of the executable (.exe) or library (.dll) is invalid.'
Navigating through various issues similar to our case, we seemed to understand that the incompatibility problem could be related to having a project at x64 and another at x86. We tried to vary all possible combinations but the error remains the same. But we noticed something strange: we forced the build to x64 of the webapp in C# but in the compilation output (which we see as enabled debugging of the native code) we find the name of the webapp followed by (Win32) as if the machine continues to build at x86. I don’t know if this information can help you.

C# "System" version update

I'm in C# in Visual Studio running 2015 Update 3.
I'm using a dll that I made myself for the backend of a system, and in the references of the project, one shows the "System" as Version 2.0.5 and the project being used as a dll shows it as 4.0.0. I believe this is the cause of a conflict that is preventing me from running this app. How do I update just the system version or even specify it so I can make them the same?
I think you should go to the references of your project containing the old reference, remove System and add it with version 4.0.0.0. However, you should also check that target .NET framework versions match (maybe the older dll is obtained compiling against .NET framework 2.0 and the newest one against .NET framework 4.0).
In order to find out the cause that is preventing you from running the application (you should provide what is happening), an useful tool is Assembly Binding Log Viewer which will show the exact assemblies that the application is trying to load (fully qualified assembly names).

Unable to load .dll?

I made an application using c#.net 2.0 and linq but as we can't use Linq cause it was introduced in framework 3.5, i add some references of dll of version 3.5 and linq started working fine.
when i made the setup and installed it, it is working fine on my system but on other system it is showing error that
Unable to load System.Data.DatasetExtensions
I don't know that if other dlls are working then why this dll is creating problem? What is the solution for this?
Needs Help.Thanks.
If you are constrained to using .Net2.0, then don't bother trying to load assemblies targeting later versions of .Net. It's doomed to failure. If you want to use Linq, target >=.Net3.5, if you need to target .Net2.0, don't use Linq.
Regarding error, the assemblies that you added may be having dependencies on other assemblies. It didn't give error on your system because you had it installed on it.
But you shouldn't be doing such a thing in general. A better way would be installing the required framework version within your installer as a pre-requisite requirement.

Making a .net component

I made two functions with matlabe and wanted to make a .net component
I created a new project , added a class , and added files (two functions .m)
but when i'm tring to bult the project i got log warning message and at the end this
error occurs
Invalid .NET framework.
Either the specified framework was not found or is not currently supported.
??? Error using ==> mcc
*Error executing mcc, return status = 1 (0x1).*
There were errors during compilation process.
I know nothing about Matlab but so you have the .Net framework installed? You might need a particular version of .Net, this might be configured in your Matlab environment?
Have a look at this blog post for info on how to set the .Net framework version:
http://itscommonsensestupid.blogspot.co.uk/2009/11/matlab-invalid-net-framework-either.html
The .Net Framework doesn't support any Matlab .m files.
You have to rewrite your matlab scripts by using classes out of the .Net Framework in either C# or VB.Net.
This article looks promising.

ASP.NET Project framework error

I have a legacy project that I have inherited. It was an absolute utter and complete mess. Within version control, every single file was revision 1. Long story short it was completely broken and did not come close to compiling. dll refresh files were pointed to files outside of version control, and the dll's that were versioned were the WRONG ones. Hours and hours lost just getting this to build in VS2008.
At any rate, according to the project details the project targets framework 3.5. However, an 401.2 authorization error I get in my browser when debugging the project says that framework 2.0.* was being used.
Has anyone had seen this before, or know of a remedy?
The 3.5 version of the framework is just some additional features (such as Linq) integrated into v2.0 of the CLR. So, even if your project shows a target of 3.5, it is still running on version 2.0 of the CLR.
See http://en.wikipedia.org/wiki/.NET_Framework_version_history#.NET_Framework_3.5
Check IIS to see which version of the framework the worker process is using. Also check any class files you may also be compiling to make sure that they are using the same framework version.

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