using System;

using System.Collections.Generic;

using System.Linq;

using System.Data.Common;

using System.Data;

using System.Xml;

public class Program

{

    public static void Main()

    {

        DataTable t= new DataTable();

        t.Columns.Add("Name", typeof(string));

        DataTable t2= new DataTable();

        t2.Columns.Add("Phone", typeof(int));

        foreach( DataColumn c in t.Columns)

        {           

            if(!t2.Columns.Contains(c.ColumnName))

            {

                t2.Columns.Add(new DataColumn(c.ColumnName,c.DataType));

            }

        }

        foreach( DataColumn c in t2.Columns)

        {

            Console.WriteLine("Column : {0} , ColumnType : {1}", c.ColumnName, c.DataType.ToString());

        }

    }

}

​

​

​

​