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UserControl background become transparent in C# Winform App

I use User Control in panel. When I use white as BackColor of something it becomes transparent automatically even all kind of operation can be done over my app.

What if you try to set BackColor to 'Grey'? does it work?
And could you add screenshoot from User Control properties?

Transparent overlay over WebBrowser control c#

The following picture represents a panel over a WebBrowser control in c#.
However, if i put the panels background property to 'transparent', it will show the color 'Silver' as my form's background is silver.
My question is; how can I draw a overlay over my custom WebBrowser control so that when it is 'transparent', it will show the WebBrowser control instead of the form's background color.
Thanks.

I believe it comes down to the OnPaint methods of panels.
Where there are multiple controls overlapping each other only the top control is drawn for that area of the screen. By making the control transparent, you are making that area of the screen the forms background colour
I believe this question has some suggestions on solutions; this question seems to point towards the OnPaintBackground more specifically also
Question link

How to make any control shape irregular in c#

how to make any control of win application transparent. i want that i will assign a background image for the target control and will invoke a routine and that routine will create that control transparent in such a way that only image will visible. as a example suppose image has assign to picture box. the picture shape is not square rather irregular. if i can make picture box transparent then user will see the image only. basically i want to make a picture box or any control irregular shape. how to achieve it through code in c#.
thanks

In WPF, transparency is quasi for free. For the image-element, assign a png-image with an alpha mask and the image will be rendered with active transparency.
For controls with an solid background, you generally have to set the Background to a transparent Brush:
If you want to make a whole window partial transparent, you have to remove the border, set the window style to none, set the background brush to a transparent brush, and set the AllowsTransparency-property of the window to true.

there is one for ordinary winform at
http://www.youtube.com/watch?v=K_JzL4kzCoE

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...

Setting the parent of a usercontrol prevents it from being transparent

I've created a simple user control which is manually created with something like
MyUserControl ctrl = new MyUserControl();
The control have been designed to have BackColor = Color.Transparent and that works fine, until I set the Parent of the control to a form at which time it turns into the color of the form.
Might sound like its transparent but what it does is hide all the controls that exist on the form as well. I'm not 100% sure its the control that gets a solid background or something else thats happening when i hook it up, which prevents other controls from showing.
Basically if you do this
Create a form
Drop a button on it
In the click handler for the button you do the following
Example
MyUserControl ctrl = new MyUserControl();
ctrl.Parent = this;
ctrl.BackColor = Color.Transparent;
ctrl.Size = this.Parent.ClientRectangle.Size;
ctrl.Location = this.Parent.ClientRectangle.Location;
ctrl.BringToFront();
ctrl.Show();
Basically I want the usercontrol to overlay the entire form, while showing the underlaying controls on the form (hence the transparent background). I do not want to add it to the forms control collection because it doesn't really belong to the form, its just being shown ontop of everything else
I tried doing the same, but without setting the parent, but then the control didnt show at all.
Thanks!
EDIT: If I override the OnPaintBackground method in the usercontrol and prevent the background from being painted then it works, however that messes up with the transparent parts of a PNG image im painting in the control using DrawImage, which makes sense.

Windows Forms doesn't really support transparent controls.
You can work around this limitation by overriding the CreateParams property of the control and setting a custom style (look it up on google).
Further you have to override the painting of your control so that not only your control but also the parent control is redrawn. The reason is that the background must be painted before your control paints itself.
Finally you should override the OnPaintBackground method, as you have done, to make sure no background is painted.
Quite clumsy, and not perfect, but it should work.