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Select Some Records From Datatable And Copy To Resultant Datatable Using LINQ

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        // The above query will fetch all the matching records for Id =1  from the datatable "test".

The "If" condition check the results and copies it to the datatable.
var query = from p in dsTest.Tables["test"].AsEnumerable()              
where p.Field<string>("Id") == "1"   select p;

   if (query.Count<DataRow>() > 0)   {        dtTest = query.CopyToDataTable<DataRow>();   }

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