asp.net连接本地数据库

using System;
using System.Data.SqlClient;

public class DatabaseHelper
{
    private string connectionString = "Server=localhost;Database=YourDatabaseName;Trusted_Connection=True;";

    public void ExecuteQuery(string query)
    {
        using (SqlConnection connection = new SqlConnection(connectionString))
        {
            connection.Open();
            SqlCommand command = new SqlCommand(query, connection);
            SqlDataReader reader = command.ExecuteReader();

            while (reader.Read())
            {
                Console.WriteLine(reader["ColumnName"].ToString());
            }

            reader.Close();
        }
    }
}