how to check that data table contain some value atlest once?

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hi
i want to check in my data table that ...
my datatable contain one colum that contain value only YES and NO.

Now i want to check that atleast one "YES" row in my datatable.
how can i do that.

Posted 28-Sep-14 20:27pm

KAUTIKPATEL

Updated 28-Sep-14 20:32pm

Sinisa Hajnal

v3

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Sinisa Hajnal 29-Sep-14 2:31am

Which database? Most of them have EXISTS keyword / function - google around for your particular database. This is NOT C# qustion...

Bernhard Hiller 29-Sep-14 8:18am

That's a terrible design. Ever heard of the BOOLEAN datatype?

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Mehdi Gholam · Answer 1 · 2014-09-28T20:34:00

Solution 1

At least one row implies a row count > 0, so just Select() from your DataTable and see if you have more than 0 rows returned :
http://www.dotnetperls.com/datatable-select[^]

Posted 28-Sep-14 20:34pm

Mehdi Gholam

Comments

Raul Iloc 29-Sep-14 2:47am

Is not OK to execute SELECT, because your code will consume more resource and time then a simple "Count()". See details in my solution!

Mehdi Gholam 29-Sep-14 3:38am

The LINQ is doing the same thing under the covers.

Raul Iloc 29-Sep-14 6:25am

Is not the same. The LINQ will generate SELECT COUNT(*) FROM ... WHERE that is different then: SELECT * FROM ... WHERE, get the data in DataTable, and only after that to count the results, because even the execution of the SELECT * take longer then SELECT COUNT(*), and to fill all results could take a lot of time, depend on the amount of data from the table.

Mehdi Gholam 29-Sep-14 7:34am

Generally that would be true, but DataTable does not support the full "sql query" commands.

Raul Iloc 30-Sep-14 7:18am

Maybe is a misunderstanding regarding the original question. The question is about the data from a data table, and this means in my understanding the data from a database table, and your understood "DataTable" object with data inside it.

Raul Iloc · Answer 2 · 2014-09-28T20:43:00

You should use Count() over an LINQ expression like in the next example:

C#

//Declare the LINQ expression 
var query = from wa in dataContext.YourTable
        where wa.YourYesNoColumn == true; 
        select wa;
//
int count = query.Count(); //Execute the Count over the LINQ expression.
return count > 0; //Return true if exist at least one result!

Santhosh Babu Mahimairaj · Answer 3 · 2014-09-29T00:20:00

Solution 3

DataRow[] foundRows = dt.Select("page_name='Management'");

Posted 29-Sep-14 0:20am

Santhosh Babu Mahimairaj

Updated 29-Sep-14 0:21am

v3

PrakashCs.net · Answer 4 · 2014-09-29T00:35:00

Solution 4

you can use linq query to get count that contains "YES" value for particular column name

int count = dtCustomer.AsEnumerable().Count(x => x.Field<string>("ColumnName") == "YES" );

Posted 29-Sep-14 0:35am

PrakashCs.net