Cannot set Column 'EffectiveDate' to be null. Please use DBNull instead.

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hi,

i am getting error Cannot set Column 'EffectiveDate' to be null. Please use DBNull instead.
my code is

C#

dt.Columns.Add("EffectiveDate", typeof(DateTime));

   DateTime?   effectivedate=null;


  if (lastRow["Effective_x0020_Date"] != DBNull.Value)
  {

     effectivedate = Convert.ToDateTime(lastRow["Effective_x0020_Date"]);
  }


DataRow dr = dt.NewRow();
     dr["EffectiveDate"] = effectivedate;
dt.Rows.Add(dr);

i followed many things

http://codeverge.com/asp.net.presentation-controls/how-to-return-dbnull.value-inst/487162[^]

but same error i am getting

Posted 18-Jan-15 19:04pm

Manohar_manu

Updated 18-Jan-15 19:25pm

Wendelius

v3

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Wendelius · Answer 1 · 2015-01-18T19:28:00

Solution 1

COuld it simply be that lastRow["Effective_x0020_Date"] is DBNull? Then you would have the initial value (null) in effectivedate;

When assigning the data row value, try using null coalescing operator

C#

dr["EffectiveDate"] = effectivedate ?? DBNull.Value;

Posted 18-Jan-15 19:28pm

Wendelius

Comments

Merlin Tintin 2-Jul-19 7:25am

I think this is better (other you will get an error) :

dr["EffectiveDate"] = effectivedate ?? (object)DBNull.Value;