Скачать или смотреть Resolving the Calendar1_SelectionChanged Event Handler Error in C# WebForms

Learn how to fix the 'EventArgs' error when trying to get the selected date from the Calendar control in C# WebForms. Follow our step-by-step guide to ensure smooth implementation!
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This video is based on the question https://stackoverflow.com/q/65312977/ asked by the user 'Peter' ( https://stackoverflow.com/u/14831714/ ) and on the answer https://stackoverflow.com/a/65315818/ provided by the user 'v m' ( https://stackoverflow.com/u/11994347/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Understanding the Calendar1_SelectionChanged Event Handler Error

If you're working with a calendar control in a C# WebForms application, you may encounter an error related to the Calendar1_SelectionChanged event handler. Specifically, you might get a message saying: 'EventArgs' does not contain a definition for 'Start'. This can be confusing, especially when you expect to use that property directly from the EventArgs. In this post, we will clarify this issue and guide you on how to correctly retrieve the selected date from your calendar control.

The Problem Breakdown

The main error stems from the code below, where attempts are made to access a property named Start on the EventArgs parameter:

[[See Video to Reveal this Text or Code Snippet]]

Why This Error Occurs

EventArgs Limitation: The EventArgs class does not provide a property called Start. Thus, trying to access it will lead to a compilation error.

Incorrect Assumption: The code attempts to retrieve the selected date directly from e, overlooking that the selected date should come from the calendar control itself, not the event arguments.

A Simple Solution

Correctly Accessing the Selected Date

To resolve the error, you'll need to retrieve the selected date from the calendar control instead. Here’s how you can do it:

Check the Calendar Control Type: Ensure that Calendar1 is indeed a type of MonthCalendar. If it is, you will have access to properties that contain the selected date.

Access the SelectionStart Property: You can retrieve the start date from the SelectionStart property of the calendar control.

Updated Code Example

Here’s the corrected approach:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

By implementing the changes as described above, you will no longer encounter the 'EventArgs' error when dealing with your calendar selection. Always remember to pull the required properties directly from the control you are working with, rather than assuming they exist in the event arguments.

With these steps, you should be well on your way to successfully handling calendar selections in your WebForms application. Happy coding!