web.config本地数据库连接

<configuration>
  <connectionStrings>
    <add name="MyDbConnectionString" connectionString="Data Source=myServerAddress;Initial Catalog=myDataBase;User Id=myUsername;Password=myPassword;" providerName="System.Data.SqlClient" />
  </connectionStrings>
</configuration>

using System;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;

public partial class Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        string connectionString = ConfigurationManager.ConnectionStrings["MyDbConnectionString"].ConnectionString;
        using (SqlConnection connection = new SqlConnection(connectionString))
        {
            connection.Open();
            string query = "SELECT * FROM MyTable";
            SqlCommand command = new SqlCommand(query, connection);
            SqlDataReader reader = command.ExecuteReader();
            while (reader.Read())
            {
                // 处理数据
            }
        }
    }
}