How can I set a form to have a transparent background in c#?

Question

I want to set my form's background to transparent but faced an error "property value is not valid". I don't know if there is a simple way to set a transparent background image as a form in windows?

I'm trying to make a c# windows form application.

I cannot upload a picture yet.For example I want to run my app and see a picture of a book (that doesn't have any white background borders)including tools

Metro? WinForms? WPF? Silverlight? Windows Phone? ASP.Net? MonoTouch? — SLaks, Oct 03 '12 at 20:30
Hello and welcome to SO. Please *post your code* and improve your tags so that we know whether you are using WinForms or WPF. — Ondrej Tucny, Oct 03 '12 at 20:30
If the OP said "form", then I guess it's safe to assume WinForms, no? — Douglas, Oct 03 '12 at 20:31
@O.R.Mapper: Possibly, but unlikely given that they're asking about making it transparent. — Douglas, Oct 03 '12 at 20:33
duplicate of http://stackoverflow.com/questions/4387680/transparent-background-on-winforms — Dave Hogan, Oct 03 '12 at 20:42

score 4 · Accepted Answer · answered Oct 03 '12 at 21:26

4

Here's a code that may help you achieve what you are trying to do. The following code will make the form transparent but leave the controls visible. If you want to hide the controls as well, I suggest you set the form opacity to 0%

this.BackColor = Color.White;
this.TransparencyKey = Color.White;

Thanks,

I hope this helps :)

answered Oct 03 '12 at 21:26

Picrofo Software

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But I can't use this code for other background colors.Do you have any Idea? – mdhr Oct 04 '12 at 20:05
@mdhr Why not? Please let me know what are you trying to achieve. – Picrofo Software Oct 05 '12 at 12:35
@Kinected Thanks! Glad you found it helpful :) – Picrofo Software Oct 07 '12 at 21:49

score 0 · Answer 2 · answered Oct 03 '12 at 20:40

0

Given that you're using Windows Forms then set the opacity to any value from 0.0 to 1.0. Having 0.0 (complete transparency) and 1.0 (complete opacity).

form.Opacity = 0.0;

MSDN Source: How to create a transparent form.

answered Oct 03 '12 at 20:40

Erre Efe

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How can I set a form to have a transparent background in c#?

2 Answers2