How to set DateTime to null

Question

Using C   I have a string dateTimeEnd   If the string is in right format  I wish to generate a DateTime and assign it to eventCustom DateTimeEnd  of type  public Nullable lt System DateTime gt  DateTimeEnd   get  set      If dateTimeEnd is null or empty I need eventCustom DateTimeEnd set to null   I am trying to achieve this using the following code but I get always null for eventCustom DateTimeEnd   Could you please help me out to define what is wrong in my code      DateTime  dateTimeEndResult       if   string IsNullOrWhiteSpace dateTimeEnd           dateTimeEndResult   DateTime Parse dateTimeEnd     eventCustom DateTimeEnd   dateTimeEndResult   true    DateTime  null   dateTimeEndResult

User · Accepted Answer

It looks like you just want   eventCustom DateTimeEnd   string IsNullOrWhiteSpace dateTimeEnd         DateTime   null       DateTime Parse dateTimeEnd     Note that this will throw an exception if dateTimeEnd isn t a valid date   An alternative would be   DateTime validValue  eventCustom DateTimeEnd   DateTime TryParse dateTimeEnd  out validValue        validValue        DateTime   null    That will now set the result to null if dateTimeEnd isn t valid  Note that TryParse handles null as an input with no problems

User · Answer

DateTime is a non-nullable value type  DateTime  newdate   null    You can use a Nullable lt DateTime gt   c  Nullable Datetime

User · Answer

Now  I can t use DateTime   I am using DBNull Value for all data types  It works great   eventCustom DateTimeEnd   string IsNullOrWhiteSpace dateTimeEnd      DBNull Value     DateTime Parse dateTimeEnd

User · Answer

You can write  DateTime  newdate   null

User · Answer

This line   eventCustom DateTimeEnd   dateTimeEndResult   true    DateTime  null   dateTimeEndResult    is same as   eventCustom DateTimeEnd   dateTimeEndResult    true    DateTime  null   dateTimeEndResult     because the conditional operator   has a higher precedence than the assignment operator    That s why you always get null for eventCustom DateTimeEnd   MSDN Ref

User · Answer

This should work   if   string IsNullOrWhiteSpace dateTimeEnd       eventCustom DateTimeEnd   DateTime Parse dateTimeEnd   else     eventCustom DateTimeEnd   null    Note that this will throw an exception if the string is not in the correct format

[c#] How to set DateTime to null

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