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Remove white background for radio button

I have an application in which I have used radio button over an image so it seems very bad with white background in radio button.
So is there a way I can remove that white background ?

Only setting the BackColor to Color.Transparent is not enough to get rid of the little border that is around the RadioButton.
What you will need to also do is call the following code for each radio button to ensure that the background does actually go transparent
rbnTest.BackColor = Color.Transparent;
Point pos = this.PointToScreen(rbnTest.Location);
rbnTest.Parent = pibPicture;
rbnTest.Location = pibPicture.PointToClient(pos);
Source (Not a true duplicate, but similar, hence not flaggin as duplicate)
I would recommend refactoring that code into a reusable method so that you do not scatter the code all over your project.

Locate the constructor for your control class. The constructor appears in the control's code file. In C#, the constructor is the method with the same name as the control and with no return value.
Call the SetStyle method of your form in the constructor.
SetStyle(ControlStyles.SupportsTransparentBackColor, true);
add the following line. This will set your control's BackColor to Transparent.
this.BackColor = Color.Transparent;
Note
Windows Forms controls do not support true transparency. The background of a transparent Windows Forms control is painted by its parent.

You can use the RadioButton.BackgroundImage or the RadioButton.BackColor property. Choose the one that suits you best

Making a transparent tab background?

I was wondering if I could draw the background of a tabpage in C# transparent like so I can see behind the window itself. I though it would give a cool effect but I don't know if or how I can do it.

You can set the Appearance property of TabControl to Buttons Instead of using BackColor property. That would bring transparent tab page look and cool effect.

VB & C# syntax
TabPage1.BackColor = Color.Transparent
this will show the tabpage1 color as the form color.

C# Transparent back color for richtext

I have a form that I want to use with background, when I'm loading the background all my labels and richtexts still have as backcolor "Control", when I choose "Transparent" for the labels it's working, but when I choose it for the richtexts I', getting the error: "Control does not support transparent background colors."
How can I fix this?

NO you can't?
set TransparencyKey of window to control background color
setting this property will make this color transparent on whole window
use two windows overlapping each other one with background and another with your controls with transparency key

opacity usercontrol c#.net 3.5

Why does not a user control have the 'Opacity' property? How can I use set the property on a user control?

For winforms
To make a UserControl transparent, we have to give it a WS_EX_TRANSPARENT style, override its OnPaintBackground method to draw the background with the opacity, and then invalidates its Parent to redraw the control whenever we need to update the graphics

For WinForms
You can just set User Control Background property to Transparent in web colors tab
but for opacity such as 50% i am looking for a solution.

Transparent LinkLabel over TabControl

I would like to put a LinkLabel with a transparent background over a TabControl. The tab control has NO tabpage.
As it's not possible to add controls other than TabPages to a TabControl, what I do it add the LinkLabel to the control that contains the TabCOntrol, and then use BringToFront on the LinkLabel. This displays it over the TabControl.
Problem: The LinkLabel displays as transparent (BackColor Property), but instead of showing the TabControl's colour as background, it shows the background colour of it's parent, the control that also contains the TabControl.
From what I understand, this is normal behaviour as a Transparent BackColor means that it'll just take the parent's colour.
Question: Is there any solution to display my LinkLabel with the TabControl's background colour?
Thanks

I may be wrong about this, but I think that if you change the LinkLabel's BackColor property in code (e.g. in your form's Load event, as opposed to just setting it in the designer) to match the color of your TabControl, it will work the way you want it to.

Thanks for your answers. I'm now get what you meant.
Using the tab Control's BackColor won't work, because this property always returns the ColorSystemColors.Control, which is greyish. However, when using visual styles (e.g. XP's default theme), the TabControl's back colour is kind of white. I cannot use white either as the tab control is not pure white, but gradient white...