Get a particular column value using C#

Hello,

I want to to retrieve a column value from a table.
Thanks for help.

string commandtext = "select column1  FROM [t1]";
            string[] list = DataAccess.ExecuteReader(commandtext).ToArray();
 public static List<string> ExecuteReader(string commandtext)
        {
            List<string> sVal = new List<string>();
            try
            {
                using (SqlConnection cnn = new SqlConnection(conn))
                {
                    cnn.Open();
                    using (SqlCommand cmd = new SqlCommand())
                    {
                        cmd.Connection = cnn;
                        cmd.CommandType = CommandType.Text;
                        cmd.CommandText = commandtext;

                        using (SqlDataReader reader = cmd.ExecuteReader())
                        {
                              // here need help.
                        }
                    }
                    cnn.Close();
                }
            }
            catch (Exception ex)
            {

            }
            return sVal.ToList().Distinct().ToList();
        }

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