How to pass null to string variable in sql query in where clause to return all records if null and data if any in C# code behind

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I want to pass null to string variable in my sql query in where clause(Eg:select * from x WHERE ISNULL('"+S+"',a.ds)=a.ds) to return all records if null and with data set if any code behind in c#

Posted 25-Apr-13 7:04am

Korathu 2

Updated 25-Apr-13 7:11am

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Sandeep Mewara · Answer 1 · 2013-04-25T07:09:00

Solution 1

Use System.DBNull as value to pass on in your query.
Refer: MSDN: DBNull[^]

Posted 25-Apr-13 7:09am

Sandeep Mewara