No overload for method ‘ToString” takes 1 arguments when casting date

Question

You want to use DateTime.ToString(format) not Nullable<DateTime>.ToString(no overload):

DateTime? myDate = form.dteStartDate;
string sqlFormattedDate = myDate.Value.ToString("yyyy-MM-dd HH:mm:ss");

Of course this doesn’t handle the case that there is no value. Perhaps something like this:

string sqlFormattedDate = myDate.HasValue 
    ? myDate.Value.ToString("yyyy-MM-dd HH:mm:ss")
    : "<not available>";