面试常用代码

最好背下来

1.取配置节数据库连接信息

string connstring = string.Empty;

ConnectionStringSettings settings = ConfigurationManager.ConnectionStrings["DataBaseConnection"];

if (settings != null)

2 .操作数据库

public DataSet ExecuteDataSet(string sql, string connectionString)

public int ExecuteNonQuery(string sql, string connectionString)

public object ExecuteScalar(string sql, string connectionString)

3.修改配置信息

public void SaveConfig(string key, string value)

注意,使用了XPATH查询相关结点