Avoid false positives on the Interface [simple example]

Many of them have been written, as if they were, but they are not checked :)
Write down and save a backup for yourself.

Click private void button2_click (Object sender, eventargs E)
{
Dialogresult result = folderbrowserdialog1.showdialog ();

If (result = dialogresult. OK)
{
Textbox2.text = folderbrowserdialog1.selectedpath;
}

Thread thread = new thread (New threadstart (getfoldersizethread ));
Thread. Start ();
}

Long-time Data calculation function: Private ulong getfoldersize (string strfoldername)
{
Ulong result = 0;

Directoryinfo info = new directoryinfo (strfoldername );

Fileinfo [] arrfileinfo = info. getfiles ();

Foreach (fileinfo in arrfileinfo)
{
Result + = (ulong) fileinfo. length;
}

Directoryinfo [] arrdirinfo = info. getdirectories ();

Foreach (directoryinfo dirinfo in arrdirinfo)
{
Result + = getfoldersize (dirinfo. fullname );
}

Return result;
}

Thread method: Private void getfoldersizethread ()
{
Ulong longfoldersize = getfoldersize (textbox1.text );

Setlabelhandler handler = delegate (ulong size)
{
Label1.text = string. Format ("total size: {0: n} kb", size/1024 );
};

If (label1.invokerequired)
{
Invoke (handler, new object [] {longfoldersize });
}
}

Delegate: Public Delegate void setlabelhandler (ulong size );