public static void Main()
DataTable dt = new DataTable();
dt.Columns.Add("column1", typeof(string));
dt.Columns.Add("column2", typeof(string));
dt.Columns.Add("column3", typeof(bool));
drInput["column1"] = "foo";
drInput["column2"] = "bar";
drInput["column1"] = "yaz";
drInput["column2"] = "moo";
foreach (DataRow dr in dt.Rows)
Console.WriteLine(dr["column1"].ToString());