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enter image description here

dtnew1.DefaultView.Sort = "Modified DESC";
DataTable unique = dtnew1.DefaultView.ToTable();

In this code's "unique" table I'm getting all values but post title value is getting repeated. I need a distinct value from post title like:

new test 2014-08-02 2  Test              8/2.2014  
test     2014-08-02 2  test testedby a   7/29/2014
1

Try this:

DataTable unique =dtnew1.AsEnumerable().GroupBy(row => row["Posttitle"]).Select(group => group.FirstOrDefault());

Add System.Data.Linq reference

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