private void Form2_Load(object sender, EventArgs e)
{
    using (SqlConnection conn = new SqlConnection("server=(local);database=Northwind;user id=sa;password=sa;"))

//引用命名空间System.Collections.Generic

Public Function Addition(a As Integer, b As Integer)
    Addition = a + b

//在panel1中添加20个Button
int row = -1;
int rowcount = 5;

for (int i = 1; i <= 20; i++)

notifyIcon1.BalloonTipIcon = ToolTipIcon.Info;

'说明：获取指定文件夹的子文件夹
'参数：
'   path:字符串,指定的文件夹路径
'   searchOption:布尔值,True 所有子文件夹; False 当前文件夹的子文件夹
'返回值：数组

'函数返回数组示例
Function GetFiles(path As String) As String()
    Dim oFso As Scripting.FileSystemObject
    Dim oFolder As Scripting.Folder
    Dim oFile As Scripting.File

Option Explicit


Private Sub Form_Load()
    

'添加 Microsoft Windows Common Controls 6.0 部件才能使用ListView
Dim item As ListItem

'添加表头
With ListView1