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How to pass null values  to test condition in where clause using LINQ

Posted on 2009-04-03
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Last Modified: 2013-11-11
my queries are

1) select * from tablename where col == null

2) select * from tablename where col  != null

i need this queries in LINQ.
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Question by:ravindra333
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naspinski earned 1000 total points
ID: 24059987

var results1 = from p in YourDataContext.tablename where p.col == null select p;
 
var results2 = from p in YourDataContext.tablename where p.col != null select p;

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by:Fernando Soto
Fernando Soto earned 1000 total points
ID: 24061162
Hi ravindra333;

You can also use this form in Linq, The database must be a Microsoft SQL server in both solution post :

            var result1 = DataContext.TableName.Where(c => c.col  == null);
            var result2 = DataContext.TableName.Where(c => c.col  != null);

Where the c in the Where clause can be any name of your choosing.

Fernando
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