How to force null in date field - access 2007?

I开发者_JS百科 have a table that contains date field.

How can I force null or empty value on this field?

Thanks in advance

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I had the same problem and solved it by this:

string DOB = "null" // this solved it , null should be a text and not a value
if(tb_date !="")
 { DOB = "#"+tb_date.text+"#" ;}

//and in the query: insert into table(....,DateofBirth,...) values (.... "',"+DOB+",'"+...) ;

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If you are referring to C# code, you can make the type nullable:

DateTime? dt = null;

Then acces it by:

if(dt == null)
  dosomething;
else
  myDT = dt.Value;

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It is possible with ADO and a query, amongst other things:

 UPDATE jobs SET atable.adate = Null 
 WHERE atable.ID=342

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Just set DBValue.Null whatever field you want to set Null.