C#.NET: Get Top and Bottom n Rows from DataTable using LINQ
LINQ, introduced in late 2007 is a way of querying data in arrays, lists, enumerable classes, XML, relational database s and anything...

https://www.programming-free.com/2013/08/top-last-n-rows-from-datatable-csharp-linq.html
LINQ, introduced in late 2007 is a way of querying data in arrays, lists, enumerable classes, XML, relational databases and anything built on these.This post explains how to get the top and bottom n number of records from C# DataTable without looping through each row using LINQ queries. A LINQ query operation consists of three actions: obtain the data source or sources, create the query, and execute the query.
For this example let me create a datatable with three columns and four rows such as this,
DataTable dt = new DataTable(); dt.Columns.Add("Column1"); dt.Columns.Add("Column2"); dt.Columns.Add("Column3"); dt.Rows.Add("A", "B", "C"); dt.Rows.Add("D", "E", "F"); dt.Rows.Add("G", "H", "I"); dt.Rows.Add("J", "K", "L");
To get the top two rows use the following query,
DataTable dt1 = dt.AsEnumerable().Take(2).CopyToDataTable();
This will produce the following output when bound to a gridview,
Column1 | Column2 | Column3 |
---|---|---|
A | B | C |
D | E | F |
To get the last two rows use the following query,
DataTable dt1 = dt.AsEnumerable().Reverse().Take(2).CopyToDataTable();
Output:
Column1 | Column2 | Column3 |
---|---|---|
J | K | L |
G | H | I |
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