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Creating a DataColumn and Adding It to a DataTable

using System; using System.Data;     class Program     {         static void Main(string[] args)         {             DataTable dt = new DataTable();             DataColumn col1 = dt.Columns.Add();             col1.ColumnName= "First Column";             col1.DataType = typeof(int);             col1.DefaultValue = 0;             col1.Unique = true;             col1.AllowDBNull = false;             DataColumn col2 = new DataColumn();             col2.ColumnName = "Second Column";             col2.DataType = typeof(string);             col2.MaxLength = 50;             dt.Columns.Add(col2);             dt.Columns.Add("Column-3", typeof(string)).MaxLength = 50;             DataColumn col4 = new DataColumn("Column-4");             DataColumn col5 = new DataColumn("Column-5", typeof(int));             dt.Columns.AddRange(new DataColumn[] { col4, col5 });             Console.WriteLine("DataTable has {0} DataColumns named:",dt.Columns.Count);             foreach (DataColumn col in dt.Columns)                 Console.WriteLine("\t{0}", col.ColumnName);         }     }