Question

I am trying to get data from xml file and then filter using datatable.Select() to adding the values in combobox.

But I am getting duplicate values, so I need to apply DISTINCT sort. Tried dt1.DefaultView.ToTable but no luck. still its adding duplicate items also in combobox. below is the code snippet which I am using:

DataTable dt1 = XMLCategory.ds.Tables["AgencyInfo"];

DataRow[] foundRows;
foundRows = dt1.Select("AgencyRegion='" + cmbAgPr_Region.Text + "'");
DataTable dt2 = dt1.DefaultView.ToTable(true, "AgencyMarket");
for (int i = 0; i < foundRows.Length; i++)
{
    cmbAgPr_Market.Items.Add(foundRows[i][1]);
}

Any help..

Answer 1

You can use LINQ with GroupBy to get distinct. Sample code below assumes you need to distinct in the column “columnName” with string type:

 var foundRows = dataTable.Select("...")
                  .GroupBy(row => row.Field<string>("columnName"), 
                           (key, group) => group.First())
                  .ToArray();