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I would like to insert product but SelectListItem returned true Can you help me? It will make me crazy
A null reference exception means a reference type is not populated (pointing to null) while the logic tried to access a member of the type. In my opinion, the null reference exception on of the easiest exception to find and fix because the error message tells you exactly which line of code caused the exception. Once you know what line causes the exception, it is usually very easy to figure out why the type is null.
The community cannot see your code or the actually error message and can only guess how your code works. Is there anyway you can share your code or commit your code to GitHub? Please do not post screenshots, post the actual code.
If I had to guess, you are getting a null exception accessing a SelectListItem type in a POST handler. The most common reason on these forums is caused by not populating the List<SelectListItem> on the post handler. For some reason, new web developers think populating a List<SelectListItem> on the GET will magically persist in the POST as well which is not the case.
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on postback, the <select> only posts the selected value (or values if multiple enabled). the option list name/value collection is not included in the post. if you need this collection in post processing, you need to recreate on the post code.