winform读取数据库

using System;
using System.Data;
using System.Data.SqlClient;
using System.Windows.Forms;

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
    }

    private void button1_Click(object sender, EventArgs e)
    {
        string connectionString = "Server=your_server;Database=your_database;User Id=your_username;Password=your_password;";
        using (SqlConnection connection = new SqlConnection(connectionString))
        {
            connection.Open();
            string query = "SELECT * FROM your_table";
            SqlCommand command = new SqlCommand(query, connection);
            SqlDataReader reader = command.ExecuteReader();

            while (reader.Read())
            {
                // 假设有一个名为dataGridView1的DataGridView控件
                dataGridView1.Rows.Add(reader["column1"].ToString(), reader["column2"].ToString());
            }

            reader.Close();
        }
    }
}