可以用很多方法完成.
如
使css并在运行时分配为

It can be done by many ways.
as
make css and assign at runtime as

Pabel1.CssClass = "someCssClass"

或

or

TextBox1.Style.Add("Background-color", "#ccc");

或

or

TextBox1.Attributes.Add("style", "Background-color:#ccc");