limit no. of rows in a datatable

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hi! i have got a datatable dt which is retrieving all the records but i need only the top 15 so how can i restrict the no. of records in datatable. Please help i tried few codes like

C#

dt.AsEnumerable().Take(15).CopyToDataTable(dtnew);

but this throws an error as No overload for method 'CopyToDataTable' takes '1' arguments

So, how can i restrict the datatable dt?

Please help!
Thanking You in advance!

Posted 13-May-12 21:56pm

Shruthi.BT

Updated 13-May-12 21:59pm

Mohammad A Rahman

v2

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Ganesan Senthilvel · Answer 1 · 2012-05-13T22:02:00

You can try using the below LInQ code sample:

C#

DataView dataView = new DataView(dataTable);
dataView.RowFilter = String.Format("EventDate > '{0}'", DateTime.Now);
dataView.Sort = "EventDate";
dataTable = dataView.ToTable();
while (dataTable.Rows.Count > _rowLimit)
{
    dataTable = dataTable.AsEnumerable().Skip(0).Take(50).CopyToDataTable();
}
return dataTable;

dharan1990 · Answer 2 · 2012-05-13T22:36:00

Solution 4

If you need only top 15 rows from the database ...its better to use this sql command

SQL

select TOP(15) colname from tablename;

this will return top 15 rows and use datatable to fill this result....

Posted 13-May-12 22:36pm

dharan1990

Updated 14-May-12 10:08am

v3

Comments

Maciej Los 14-May-12 16:02pm

Good answer, my 5!

VJ Reddy · Answer 3 · 2012-05-14T10:55:00

The statement

C#

dt.AsEnumerable().Take(15)

given in the question retrieves the first 15 records and returns an IEnumerable of DataRow as explained here
http://msdn.microsoft.com/en-us/library/bb503062.aspx[^]

The issue is not because of Take(15), but because of CopyToDataTable method.

CopyToDataTable has three over loads as explained here
http://msdn.microsoft.com/en-us/library/bb360272[^]

The first overload does not take any parameter and returns a DataTable.
Whereas the Second and Third overloads take a DataTable as an argument and copy the rows returned by the query in to this DataTable. While doing so the LoadOption parameter is also must in both the overloads.
So there is no over load of CopyToDataTable method which takes only 1 argument. Hence, the error is thrown.

The LoadOption parameter gives the options explained here
http://msdn.microsoft.com/en-us/library/system.data.loadoption[^]

So for the query to execute and give the top 15 records either call it as

C#

var dtnew = dt.AsEnumerable().Take(15).CopyToDataTable();

or as

C#

dt.AsEnumerable().Take(15).CopyToDataTable(dtnew,LoadOption.OverwriteChanges);

Ashish Sehajpal · Answer 4 · 2012-05-13T22:05:00

Solution 2

You can use the default method without arguments in it.

C#

DataTable dtnew = dt.AsEnumerable().Take(15).CopyToDataTable<datarow>();</datarow>

but why you are limiting it on front end? you should do this in database itself in the stored procedure or query you are firing.

Posted 13-May-12 22:05pm

Ashish Sehajpal

v2

AmitKumar89 · Answer 5 · 2012-05-13T22:16:00

Solution 3

Hi,

Try this:

C#

dt.Rows.Cast<system.data.datarow>().Take(n)
//n is the no of rows.

All the best.
-AK

Posted 13-May-12 22:16pm

AmitKumar89

Updated 13-May-12 22:21pm

v2