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c#sortingdatatabledefaultview

Sorting datatable by two columns with one column asc and the other one desc c#

I have multiple columns in datatable like this:

   COL1   COL2 COL3      
   aaa    5    bla
   bbb    8    blablabla
   ccc    11   blabla
   ddd    9    bl
   eee    6    blabl

I'm trying to sort this datatable by COL1 asc and by COL2 desc BOTH!

I have tried the following solution but it doesn't exactly sort the second column:

DataTable dt = GetMyData();
dt.DefaultView.Sort = "COL1";
dt.DefaultView.Sort = "COL2 DESC";
dt = dt.DefaultView.ToTable();
Solution

  • Use LINQ to DataSet/DataTable

    https://msdn.microsoft.com/en-us/library/bb386977.aspx

    var newDt = dt.AsEnumerable()
            .OrderByDescending(x => x.Field<int>("COL2"))
            .ThenBy(x => x.Field<string>("COL1"))
            .CopyToDataTable();