调用FormClosing事件，但没有任何反应

Question

I'm trying to save the file as soon as the form is closed but it does not work properly. It shows the message, but when I tell the program I want to save nothing happens, is as if it executes a return

this.FormClosing += new FormClosingEventHandler(OverrideEventClosing);

private void OverrideEventClosing(object sender, FormClosingEventArgs e) {
 DialogResult dialogResult = MessageBox.Show("Do You Want To Save Your Data", "CodeJuggler", MessageBoxButtons.YesNo);
 if (dialogResult == DialogResult.Yes) {
  string myExePath = System.Reflection.Assembly.GetEntryAssembly().Location;
  System.IO.StreamWriter file = new System.IO.StreamWriter(@ "C:\DB.txt");

  foreach(ListViewItem cliente in listView1.Items) {
   file.WriteLine(string.Format("{0}|{1}|{2}|{3}", cliente.SubItems[0].Text, cliente.SubItems[1].Text, cliente.SubItems[2].Text, cliente.SubItems[3].Text));
  }
 }

}

Answer 1

写入后刷新并关闭流。（foreach之后）

Answer 2

Problem solved with unmanifested line addition

Project > Add New Item > Application Manifest File

Application Manifest File

<requestedExecutionLevel level="requireAdministrator" uiAccess="false" />

and using this

string myExePath = AppDomain.CurrentDomain.BaseDirectory;
System.IO.StreamWriter File = new System.IO.StreamWriter(myExePath + @"\item.txt");