如何在C#Web应用程序中连接到数据库

using System;
using System.Data.SqlClient;

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        string connectionString = "Data Source=YOUR_SERVER_NAME;Initial Catalog=YOUR_DATABASE_NAME;User ID=YOUR_USERNAME;Password=YOUR_PASSWORD";
        string queryString = "SELECT * FROM YOUR_TABLE_NAME";

        SqlConnection connection = new SqlConnection(connectionString);
        SqlCommand command = new SqlCommand(queryString, connection);
        SqlDataReader reader;

        try
        {
            connection.Open();
            reader = command.ExecuteReader();

            while (reader.Read())
            {
                // Process the data from the database
            }

            reader.Close();
        }
        catch (Exception ex)
        {
            // Handle any errors
        }
        finally
        {
            connection.Close();
        }
    }
}