Hello Waqar,
I am sorry for the inconvenience you experienced.
The behaviour your observe, could appear when Options dialogue of Package Manager Settings is not closed through the OK button. Following you can find a workflow, which is both a test for the cause of the problem, and a solution (if indeed the closing of the dialogue failed):
1. Close Samples Kit.
2. Start Visual Studio and open the Options dialogue (TOOLS > NuGet Package Manager > Package Manager Settings).
3. Enable the Package Restore settings.
4. Make sure to close the dialogue through the OK button.
5. Start Samples Kit and try to open the solution of the sample again.
In case you are unable to open the solution of the sample after applying this workflow, could you provide us with details about the version of Visual Studio, the version of NuGet Package Manager, and the content of the NuGet.Config file, which is located in the %APPDATA%\NuGet folder.
I am looking forward to your feedback.
Regards,
Doroteya
Telerik
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