After updating a Project from VS2008 to VS2012 the program crashes because a 4.0 dll is required

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Hello,

I upgraded a .NET 3.5 Solution written in VS2008 to VS2012. (Simply by opening the solution in VS2012)

Everything went fine, the code can be compiled.
When running the code the IDE presents me the following Errormessage:

Location:<Global.System.Diagnostics.DebuggerStepThroughAttribute()> _
Protected Overrides Sub OnCreateMainForm()
Me.MainForm = Global.Daimler.Sisam.UI.SBE.FormSBE
End Sub
 
Error: An error occurred creating the form. See Exception.InnerException for details. The error is: Could not load file or assembly 'System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified.

It seems that the System cannot find the System.Drawing.dll 4.0. For this should be installed (Framework 4.0 and 4.5 are present) I don't understand why the System is looking for it. Every reference is set to the Drawing 2 dll.
I want to stick to framework 3.5 and the contained Drawing 2 dll. I don't want any reference to a higher framework because it will not be present on the PCs where the software will be installed.

Do you know why this happens and what I can do?

Thank you very much

Best regards

Jens

additional information copied from non-solution below
Thanks for your answers,
These settings were the First I checked and they all were 3.5
....
Any other ideas?

Posted 29-Nov-13 3:40am

immes

Updated 29-Nov-13 6:47am

Nelek

v4

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Comments

Ganesh KP 29-Nov-13 9:59am

Did u tried of setting the target platform to dotNET 3.5 instead of 4.0 or 4.5 from the project properties section? To do that Right click on your project and Click on Properties and in the left side pane, select Application and set the Target Platform to 3.5 and try. I hope this will work and if it doesn't work then post it again what error u got latest.

Maciej Los 29-Nov-13 11:06am

Right direction!

immes 29-Nov-13 14:22pm

Thanks for your answers,

These settings were the First I checked and they all were 3.5
....

Any other ideas?

Best regards

Jens

Sergey Alexandrovich Kryukov 29-Nov-13 15:46pm

No, they are not, otherwise nothing would require v.4. Check again, this time, for all assemblies/projects.
—SA

Sergey Alexandrovich Kryukov 29-Nov-13 15:45pm

That is the solution. Will you post it as the answer.
The advice should be: either get all assemblies of required version or set the target to .NET v.3.5.
—SA

immes 29-Nov-13 16:54pm

I'll check every Assembly and try again...

immes 4-Dec-13 12:32pm

Hello,I checked all contained Projects in the Solution. They all say the Target framework is set to 3.5. I also checked all the referenced dlls in all projects. None is higher than 3.5. I also tried to reference the dll in question again... So this seems not to be the reason...Anybody got an other idea?

Sergey Alexandrovich Kryukov 4-Dec-13 12:44pm

Simply set the target to 3.5 for all remaining assemblies. What's wrong with that?
—SA

immes 4-Dec-13 13:31pm

I don't know if I understand you. There are no remaining assemblys that need to be set. Really all are set to 3.5 or lower...

Sergey Alexandrovich Kryukov 4-Dec-13 13:40pm

What can be lower then 3.5? 2.0 would be acceptable though, but hardly anything else.
—SA

immes 4-Dec-13 13:46pm

Thats exactly how it is. System.Drawing for instance is 2.0. I don't know if there is an explicit 3.5 Version of it. After referencing it again it was still 2.0....

Sergey Alexandrovich Kryukov 4-Dec-13 13:58pm

Then you should no have any problems...
—SA

immes 4-Dec-13 14:09pm

Unfortunately the problem is still there....I don't know if the VS2012 project upgrade wizard made something that I cannot see...
Thank you for your help.

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immes · Answer 1 · 2014-02-21T09:39:00

Solution 2

Hello,

it's been a while but for I found the solution I thought I post it here in case anybody has the same problem.

So what helped me was to compile the Project with .NET 4.5 as target. Then set it back to 3.5 and compile again.

Best Regards

Jens

Posted 21-Feb-14 9:39am

immes