How to check Unique before insert in database through linq with C# in asp.net

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I was using for chek unique through c# coding with the help of sqlcommand class write :

select count(*) as v_count from  dbo.BookTopic where TopicId <>1 and Topic='abc'

that is working fine...

But i want to write this coding in linq ...please help me...

Thank's in Advance.

Posted 23-May-11 19:15pm

Niranjankr

Updated 24-May-11 13:43pm

Wonde Tadesse

v3

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Wonde Tadesse · Answer 1 · 2011-05-24T14:00:00

Solution 2

I am assuming that you have a collection class called BookTopic. Then here is what the SQL query will look like in LINQ.

C#

int count = (from bt in new BookTopic()
               where !bt.TopicId.Equals(1) && bt.Topic.Equals("abc")
               select bt).ToList().Count;

I hope this helps you well.

Posted 24-May-11 14:00pm

Wonde Tadesse

Updated 24-May-11 14:15pm

v2

Comments

NandaKumer 25-May-11 14:28pm

Good

Wonde Tadesse 6-Dec-11 10:51am

Thanks

Ashishmau · Answer 2 · 2011-05-23T19:19:00

Solution 1

u can use conditional count in LINQ
see this link
http://msdn.microsoft.com/en-us/vcsharp/aa336747#countConditional[^]

Posted 23-May-11 19:19pm

Ashishmau

Comments

Niranjankr 24-May-11 1:40am

try to understand my Question ...before insert in database i want to check is Data Unique or not through Linq....

Ashishmau 24-May-11 1:53am

so what, First of all, take ur column data from database in collection list and then u can check for unique values using linq as provided in above link.