try this :
namespace ConsoleApplication2
{
public class DT
{
public double Col1;
public double Col2;
public double Col3;
}
class Program
{
static void Main(string[] args)
{
DT dt = new DT();
DataTable dtb = new DataTable();
dtb.Columns.Add("col1");
dtb.Columns.Add("col2");
dtb.Columns.Add("col3");
DataRow dr1 = dtb.NewRow();
dr1["col1"] = 100;
dr1["col2"] = 1.78189086914;
dr1["col3"] = 2.07949829101599;
dtb.Rows.Add(dr1);
foreach (DataRow dr in dtb.Rows)
{
dt.Col1 = Convert.ToDouble(dr["col1"]);
dt.Col2 = Convert.ToDouble(dr["col2"]);
dt.Col3 = Convert.ToDouble(dr["col3"]);
}
}
}
}