What to do if null exception occur in C#?

See ,I have drop down control and i have keep the LIST as datasource. But if list is null Then it throw nul开发者_开发知识库l exception. So what is the standard way to handle this situation?

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If you can, keep the list as an empty list rather than a null list. It's easy to confuse the usage of an empty list with a null list (what do each of these mean), and if you use empty lists consistently then you'll reduce the opportunity for null pointer exceptions.

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Bind the list to the dropdown after checking whether the list is null or not.

if (list != null) {
   dd.DataSource = list;
}
else {
   dd.DataSource = new List<ObjType>();
}

Note: ObjType is the type of list items that you are using in the dropdown, for example string, if the list that you are using is a list of strings.

Thanks