ASP.NET Datagrid Date Formatting with NULLS
https://mreschke.com/77/aspnet-datagrid-date-formatting-with-nulls
When displaying a formated date string in an ASP.NET datagrid, you get an error if the dataset field is NULL If closeDate is not NULL, this works fine, otherwise it errors. This works if closeDate is not NULL, otherwise it displays MM/dd/yyyy (in that format, not date format, does not display date) This works if closeDate is null (displays nothing), or contains a date. This is what you want to use.