sorting in datatable

DataTable dtddlHotel=GetDataFromData();
 DataTable distinctTable = dtddlHotel.DefaultView.ToTable( /*distinct*/ true);

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Or
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Example
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Table Emp Has One column Year and having Data
------------------
Year
------
2014
2015
2016



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DataTable dt = new DataTable();
       dt=getData("Select Year From emp");
        DataView dtview = new DataView(dt);
        dtview.Sort = "Year DESC";    
        dt = dtview.ToTable();
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Now In dt
contain
Result
---------------------
Year
--------
2016
2015
2014    
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For Asending
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DataTable dt = new DataTable();
       dt=getData("Select Year From emp");
        DataView dtview = new DataView(dt);
        dtview.Sort = "Year ASC";    
        dt = dtview.ToTable();