How to unzip a password protected zip files

 private void button18_Click(object sender, System.EventArgs e)
    {
	Chilkat.Zip zip = new Chilkat.Zip();
	zip.UnlockComponent("Anything for 30-day trial");
	
	// To open a password-protected zip, set the password
	// prior to opening the Zip.
	zip.SetPassword("test");
	
	// This test file has been uploaded to:
	// http://www.example-code.com/testData/passwordProtected.zip
	bool success = zip.OpenZip("passwordProtected.zip");
	if (!success) 
	{
	    MessageBox.Show(zip.LastErrorText);
	    return;
	}
	
	// Unzip into a relative subdirectory, which is created
	// if it does not yet exist:
	int numFilesUnzipped = zip.Unzip("myUnzipDir");
	if (numFilesUnzipped == -1) 
	{
	    MessageBox.Show(zip.LastErrorText);
	}
    }