Error Handling Method 1: Day 1 of 23

Error handling using the HandleError() attribute at the action method level.

Step 1

Create a MVC project from the "Empty" template. Right-click on "Controllers" and select "Add" >> "Controller".

Step 2

Select "MVC 5 Controller - Empty" to add an empty controller. Click on the "Add" button.

Step 3
Name the controller "HomeController". The Index() action result method will be added.

Step 4
To add a view, right-click on "Index" and select "Add View...".

Step 5
Name the view and select "Empty (without model)" as the template. Click on the "Add" button.

Step 6Now we need to create a custom error page so that when an error occurrs, this custom error page is displayed. This error page is common for many kinds of errors generated through any page. So we create it under the shared folder.

Right-click on “Views”, select “Add” >> “New Folder”. 



Step 7Name the folder "Shared", this will create a "Shared" folder under the view.



Step 8Right-click on the "Shared" folder and select "Add" >> "View".



Step 9Name the view as "Error" and select "Empty (without model)" as the template.



Step 10Design your desired custom error page in Error.cshtml.



Step 11Open the web.config file, set the customErrors mode=”On” under the system.web. If you do not want to display a custom error page then you can set it to “Off”.



Step 12The Handle error attribute is used to handle an exception that is thrown by an action method. Apply the HandleError() attribute above the index action method and generate an exception inside the index action method. 



Step 13Now run the project and you will get a NullReferenceException as the session "temp" is not available.



Step 14Press "F5" and our custom error page is displayed.

Source Collected from CSharpcorner.com

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