C#查询SqlServer数据库并返回单个值的方法

static public string GetSqlAsString(string sqlText, SqlParameter[] sqlParameters, string databaseConnectionString) {  string result = "";  SqlDataReader reader;  SqlConnection connection = new SqlConnection(databaseConnectionString);  using (connection) {    SqlCommand sqlcommand = connection.CreateCommand();    sqlcommand.CommandText = sqlText;    if (sqlParameters != null) {      sqlcommand.Parameters.AddRange(sqlParameters);    }    connection.Open();    reader = sqlcommand.ExecuteReader();    if (reader != null)      if (reader.Read()) {        result = reader.GetString(0);      }  }  return result;}