I get 'data is null' exception

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In the following code I get the exception 'Data is Null. This method or property cannot be called on Null values.' at line if(reader1...)

SQL

while (reader1.Read())
if(reader1.GetDateTime(9) !=null)

Posted 21-May-14 19:25pm

S.Rajendran from Coimbatore

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Sergey Alexandrovich Kryukov 22-May-14 2:17am

I thought that after asking 251 questions one could learn how to ask them. :-)
Are you even trying to learn anything from the answers and comments you receive? Still the same story: no debugging, not relevant information...
—SA

4 solutions

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Karen Mitchelle · Answer 1 · 2014-05-21T19:44:00

Solution 1

Hi,
I think your reader1 doesn't have a value. Please check if it has. Then come back.

Or, there's nothing to read on reader1.
Thanks.

Posted 21-May-14 19:44pm

Karen Mitchelle

v2

soumyajayaraj · Answer 2 · 2014-05-21T20:06:00

Solution 2

Try this

int x = reader.GetOrdinal("datefield");

if(!reader.IsDBNull(x))
dateValue = reader.GetDateTime(x);

Posted 21-May-14 20:06pm

soumyajayaraj

Pravuprasad · Answer 3 · 2014-05-21T20:10:00

Solution 3

Here the exception comes only if the reader1 doesn't contain any value . But you are checking this while while loop . So modify your code as below :

VB

while (reader1.Read())
{
if(reader1.GetDateTime(9) !=null)

//your logic here
}

Posted 21-May-14 20:10pm

Pravuprasad

kumar9avinash · Answer 4 · 2014-05-21T20:16:00

Solution 4

Hi,
i think your Reader doesnt has any value so your reader.read () is always false , you should check your ado.net commands .

please chechk wether reader.hasrows is true or false and reader.fieldscount how much it shows
then you know your issue. :)

Posted 21-May-14 20:16pm

kumar9avinash