// C# Extension Method

// Doc: https://csharp-extension.com/en/method/1002771/idatareader-getcolumnnames

​

// @nuget: Z.ExtensionMethods

​

using System;

using System.Collections.Generic;

using System.Data;

using System.Data.Common;

using System.Data.SqlClient;

using System.Linq;

public class Program

{

    public static void Main()

    {

        string sql = "SELECT 1 AS IntColumn, 'FizzBuzz' AS StringColumn";

        using (var conn = new SqlConnection(FiddleHelper.GetConnectionStringSqlServer()))

        {

            conn.Open();

            using (DbCommand command = conn.CreateCommand())

            {

                command.CommandText = sql;

                using (IDataReader reader = command.ExecuteReader())

                {

                    reader.Read();

​

                    //C# Extension Method: IDataReader - GetColumnNames

                    List<string> result = reader.GetColumnNames().ToList();

                    foreach(var colName in result)

                    {

                        Console.WriteLine(colName);

                    }

                }

            }

        }

    }

}