If you have problem in displaying CalendarExtender when it appears like this:

You could solve problem by right-clicking on your project and then selecting Manage NuGet packages. Then follow this picture bellow

If you have problem in displaying CalendarExtender when it appears like this:

You could solve problem by right-clicking on your project and then selecting Manage NuGet packages. Then follow this picture bellow

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You could solve problem by right-clicking on your project and then selecting

Manage NuGet packages. Then follow this picture bellowFollow this picture below.