数据库链接

private void button1_Click(object sender, EventArgs e)
        {
            SqlConnection Conn = new SqlConnection("Server=192.168.2.10;Database=Fly;uid=sa;pwd=***");
            Conn.Open();
            SqlCommand cmd = new SqlCommand();
            cmd.CommandText = "INSERT INTO [Fly].[dbo].[A](ID,ID_Name)VALUES('E','E项目')";
            cmd.Connection = Conn;
            cmd.ExecuteNonQuery();//这个仅仅执行SQL命令，不返回结果集，实用于建表、批量更新
            Conn.Close(); // 关闭数据库链接
        }
                //------------------------------------------------------------------------------------------------------------------------------
                        private void button2_Click(object sender, EventArgs e)
        {
            String connsql = "Server=192.168.2.10;Database=Fly;uid=sa;pwd=***"; // 数据库链接字符串,database设置为本身的数据库名，以Windows身份验证
            try
            {
                using (SqlConnection conn = new SqlConnection())
                {
                    conn.ConnectionString = connsql;
                    conn.Open(); // 打开数据库链接
                    String sql = "select * from Fly..A"; // 查询语句
                    SqlDataAdapter myda = new SqlDataAdapter(sql, conn); // 实例化适配器
                    DataTable dt = new DataTable(); // 实例化数据表
                    myda.Fill(dt); // 保存数据  
                    dataGridView1.DataSource = dt; // 设置到DataGridView中
                    conn.Close(); // 关闭数据库链接
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show("错误信息：" + ex.Message, "出现错误");
            }
        }