Thank you for writing.
Yes, you can, you only need to change the referenced assemblies of the project. The only limitation is that the Visual Studio toolbox can only reference one version of the assemblies, so to work at design time your project version must match the version used in the toolbox.
If there are obsoleted and removed controls you will have to upgrade to their current equivalents. You cannot use two versions of a control in a single application . There might be properties or functionality that are changed, and you will need to check and update this as well.
I hope this will be useful. Let me know if you have additional questions.
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