how to access multiple column from database in webservice

The code below works well to retrieve one column but I need to retrieve multiple columns. 

using System.Collections.Generic;

using System.Web;

using System.Web.Services;

using System.Web.Services.Protocols;

using System.Data.SqlClient;

using System.Data;

using System.Data.Common;

using System.Collections;

///

[WebService(Namespace = "http://tempuri.org/")]

[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]

[System.Web.Script.Services.ScriptService]

public class actName : System.Web.Services.WebService {

SqlDataReader reader = null;

konnect kct = new konnect();

SqlConnection gap;

public actName () {

//Uncomment the following line if using designed components

//InitializeComponent();

[WebMethod]

public string[] FindName(string prefixText)

//return all records whose Title starts with the prefix input string

List<string> titleArList = new List<string>();

string sq = "select name from tblretainer where active = 1 and name like '%'+@pref+'%'";

SqlCommand cm = new SqlCommand(sq, gap);

cm.Parameters.AddWithValue("@pref", prefixText);

while (reader.Read())

string strTemp = reader["name"].ToString();

return titleArList.ToArray();