How to ger Selected Records From Dataset ?

You can use datatable.Select() method, you would have got the datarow collection then you can insert these row collection into your new dataset.

Dim drFilter() As DataRow
drFilter = DataSet.Tables("TableName").Select("Speed = 0")

instead of using dataset use data table and try the below code

 SqlDataAdapter da = new SqlDataAdapter("select id,speed from tablename", objCon);
int[] array = new int[5];
int i=0;
            DataTable DataTabledt1 = new DataTable("speed");
            da.Fill(DataTabledt1);
            DataColumn dc = DataTabledt1.Columns["speed"];
 DataColumn dc1 = DataTabledt1.Columns["id"];
            foreach (DataRow row in DataTabledt1.Rows)
            {
               
               if(Convert.ToInt32(row[dc].ToString())==0)
                  {
                      array[i]=Convert.ToInt32(row[dc1].ToString());
                  }
               
            }

if(array.count>0)
{
   Response.write(array[0]+"to"+array[array.count-1]+"0" )
}

public class IDSpeed
    {
        public int Id { get; set; }
        public int Speed { get; set; }
    }
    class Program
    {
        static void Main(string[] args)
        {
            //Create a demo list for ID and Speed
            List<IDSpeed> temp = new List<IDSpeed>();
            temp.Add(new IDSpeed { Id = 1, Speed = 15 });
            temp.Add(new IDSpeed { Id = 2, Speed = 23 });
            temp.Add(new IDSpeed { Id = 3, Speed = 0 });
            temp.Add(new IDSpeed { Id = 4, Speed = 0 });
            temp.Add(new IDSpeed { Id = 5, Speed = 0 });
            temp.Add(new IDSpeed { Id = 6, Speed = 0 });
            temp.Add(new IDSpeed { Id = 7, Speed = 72 });

            foreach (IDSpeed item in temp)
            {
                Console.WriteLine(item.Id + " " + item.Speed);
            }
            //Find all id which contains only zero
            var filteredRows = from n in temp.AsEnumerable()
                               where n.Speed.ToString().Contains("0")
                               select n;
            foreach (var item in filteredRows)
            {
                Console.WriteLine(item.Id);
            }
            Console.ReadKey();
        }
    }

JMD :-)

You can simply query the existing dataTable (the data which you have retrieved from the database must be in a datatable). Now, you can query that DataTable just like you query a database. I think you won't be able to use the DISTINCT constraint on DataTable but you can use utilize the WHERE clause to get your desired records.
Another way is to query the default dataview. There is a defaultView for every dataTable, you don't need to query that view but just use the filter property which is something like DataView.RowFilter. (Get more details for dataview at http://msdn.microsoft.com/en-us/library/system.data.dataview.rowfilter.aspx[^]

Hope it will work for you :)