在C＃中使用Graphics.DrawString时，如何减少闪烁？

Below is C# code that draws text on to a progress bar. It is used to add text to a progress bar, showing a remaining time count-down. I used the Graphics class to draw a string instead of a Windows Form label, as the label background could not be set to transparent when placed on a progress bar. Below is C# code that draws text on to a progre