Data.ExecuteScalarList

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The ExecuteScalarList method executes a query and returns a list of values of the specified column of the every row in the resultset returned by the query. Other columns are ignored.

ExecuteScalarList.cs

using System;
using System.Collections.Generic;

using NUnit.Framework;

using BLToolkit.Data;

namespace HowTo.Data
{
    using DataAccess;

    [TestFixture]
    public class ExecuteScalarList
    {
        List<string> GetNameList1()
        {
            using (DbManager db = new DbManager())
            {
                return db
                    .SetCommand("SELECT FirstName FROM Person")
                    .ExecuteScalarList<string>();
            }
        }

        [Test]
        public void Test1()
        {
            List<string> list = GetNameList1();

            Assert.AreNotEqual(0, list.Count);
            Assert.IsNotNull(list[0]);
        }

        List<string> GetNameList2()
        {
            using (DbManager db = new DbManager())
            {
                return db
                    .SetCommand("SELECT * FROM Person")
                    .ExecuteScalarList<string>("FirstName");
            }
        }

        [Test]
        public void Test2()
        {
            List<string> list = GetNameList2();

            Assert.AreNotEqual(0, list.Count);
            Assert.IsNotNull(list[0]);
        }
    }
}

App.config

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <connectionStrings>
        <add
            name             = "DemoConnection"
            connectionString = "Server=.;Database=BLToolkitData;Integrated Security=SSPI"
            providerName     = "System.Data.SqlClient" />
    </connectionStrings>
</configuration>