当readonly设置为true或false时，什么控制textBox背景颜色

Question

Usually when we set readonly true or false in a textbox, the background automatically switches into grey or white.

But, on my code, in some specific cases I wanna have to turn the background red, or green, etc. for a moment, and later I want it to behave normaly.

The problem is that after I set the background to red, when I change the readonly setting, the color won't change back into grey or white, I've been using the following code to get it to grey (read only), but I want it to auto change the color as it used before.

textBox1.BackColor = Control.DefaultBackColor;

Answer 1

If you wanna reset the way the BackColor is set, you simply use the following method

textBox1.ResetBackColor();

And it will turn the background to white or grey accordingly to read only again