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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?

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.

Use image as a border in C#

I am creating a custom application in C# and I need to use a bitmap image instead of the standard windows borders. How can i do this?

If you are working with WinForms set
FormBorderStyle to None
BackgroundImage to your desired image
BackgroundImageLayout to Stretch
If you want to repeat a pattern on your boder instead, set
BackgroundImageLayout to Tile
and hide the center of the image with a panel.

Windows Forms C# Panel should not have white background, and panel should be only image

I have a windows forms, i have placed an image on it, and the image is not rectangular, so white space lefts with it, because windows form is either square or rectangular, but image is not, i want panel should be only image, rest of the space should not be visible, i am attaching an image to describe further.
Thanks
Atif

as I understand it you want your form to be invisible?
that isn't supported well in winforms and you should consider moving to WPF.
however theres this example:
http://www.blackbeltcoder.com/Articles/winforms/non-rectangular-splash-screen-for-winforms
create a splash screen as the writer advices.

I think you have set form properties [BackgroundImageLayout:stretch] or
you have to change image size(width,height) same as form size(width,height)

Read the ImageSize before applying to the form.
Resize the form with the image size.
If you can set the ControlBox property of the Form, you can even hide the Close, Maximize and Minimize buttons from the right top corner.

So you mean to stretch your image to the window frame? Just dock the picturebox to full form size. There is an option called Dock in parent container. Use that

You need to set the BackgroundImageLayout property to ImageLayout.Stretch, ImageLayout.Zoom or ImageLayout.Tile depending on how you want the image to fill the Form.

Put the image on the form directly by setting the following properties:
Form1.BackgroundImage = MyBackgroundImage
Form1.BackgroundImageLayout = Stretch

Make a form's background transparent

How I make a background transparent on my form? Is it possible in C#?
Thanks in advance!

You can set the BackColor of your form to an uncommon color (say Color.Magenta) then set the form's TransparencyKey property to the same color. Then, set the FormBorderStyle to None.
Of course, that's just the quick and easy solution. The edges of controls are ugly, you have to keep changing the background color of new controls you add (if they're Buttons or something like that) and a whole host of other problems.
It really depends what you want to achieve. What is it? If you want to make a widget sort of thing, there are much better ways. If you need rounded corners or a custom background, there are much better ways. So please provide some more information if TransparencyKey isn't quite what you had in mind.

Put the following in the constructor of the form:
public Form1()
{
this.TransparencyKey = Color.Turquoise;
this.BackColor = Color.Turquoise;
}
Note: This method prevents you from clicking through the form.

Update:
How to: Give Your Control a Transparent Background
Deprecated:
How to: Create Transparent Windows Forms:
Note: As transparent forms are only supported in Windows 2000 or
later, Windows Forms will be
completely opaque when run on older
operating systems, such as Windows 98,
regardless of the value set for the
Opacity property.

A simple solution to get a transparent background in a winform is to overwrite the OnPaintBackground method like this:
protected override void OnPaintBackground(PaintEventArgs e)
{
//empty implementation
}
(Notice that the base.OnpaintBackground(e) is removed from the function)