Handling wih DataView for filter dataset values

we have a dataset
Dataset dsTest = oTestDL.GetTestData(ID);

if we want to use values in between a range from dataset we can use like this

DataView dvTest = dsTest .Tables[0].DefaultView;
dvTest .RowFilter = "TestID > 10 AND TestID < 18";
  foreach (DataRowView drv in dvTest)
     {
          string TestValues = drv[3].ToString();
    }