this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedSingle;
this.MaximizeBox = false;
this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;

public bool CheckForInternetConnection()
{
    bool result = false;

public partial class Form1 : Form
{

private bool CompareVersion(string oldver, string newver)
{
    bool result = false;
    //1.拆分
    string[] arroldver = oldver.Split(new string[] { "." }, StringSplitOptions.None);

/// <summary>

private void txtAmount_TextChanged(object sender, EventArgs e)
{
    TextBox box = sender as TextBox;
    if (box != null)
    {

ManagementObjectSearcher searcher = new ManagementObjectSearcher("Select * FROM Win32_NetworkAdapterConfiguration");
ManagementObjectCollection collection = searcher.Get();
foreach (ManagementObject item in collection)
{
    if (item["IPEnabled"].ToString() == "True")

IDataObject data = Clipboard.GetDataObject();
if (data.GetDataPresent(DataFormats.Text))
{
    textBox1.Text = data.GetData(DataFormats.Text) as String;
}