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private void ClearFolder(DirectoryInfo folder)
    {
        FileInfo[] files = folder.GetFiles();
        for (int i = 0; i < (int)files.Length; i++)
        {
            FileInfo file = files[i];
            try
            {
                file.Delete();
            }
            catch (Exception exception)
            {
            }
        }
        DirectoryInfo[] directories = folder.GetDirectories();
        for (int j = 0; j < (int)directories.Length; j++)
        {
            DirectoryInfo subfolder = directories[j];
            this.ClearFolder(subfolder);
        }
    }

    private void clearIECache()
    {
        this.ClearFolder(new DirectoryInfo(Environment.GetFolderPath(Environment.SpecialFolder.InternetCache)));
    }

Private Sub ClearFolder(folder As DirectoryInfo)
	Dim files As FileInfo() = folder.GetFiles()
	For i As Integer = 0 To CInt(files.Length) - 1
		Dim file As FileInfo = files(i)
		Try
			file.Delete()
		Catch exception As Exception
		End Try
	Next
	Dim directories As DirectoryInfo() = folder.GetDirectories()
	For j As Integer = 0 To CInt(directories.Length) - 1
		Dim subfolder As DirectoryInfo = directories(j)
		Me.ClearFolder(subfolder)
	Next
End Sub

Private Sub clearIECache()
	Me.ClearFolder(New DirectoryInfo(Environment.GetFolderPath(Environment.SpecialFolder.InternetCache)))
End Sub