// C# Extension Method

// Doc: https://csharp-extension.com/en/method/1002762/datacolumncollection-addrange

​

// @nuget: Z.ExtensionMethods

​

using System;

using System.Data;

public class Program

{

    public static void Main()

    {

        var table = new DataTable();

​

        //C# Extension Method: DataColumnCollection - AddRange

        table.Columns.AddRange("Column1", "Column2", "Column3"); // Add "Column1", "Column2", "Column3" to the collection

​

        Console.WriteLine(table.Columns.Count);

    }

}