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How can I set the background to transparent for my image?

I got into a problem. I downloaded a photo without a background PNG file and I used the image inside the button. And I want to make that photo transparent so I don't have that squares in the button. So I want to set transparent background for the image.
Here's an image:

First make your button background color transparent and add your image.
After that Flatstyle = flat

Image without background on winform

How can I have an image without background on a winforms application.
So that you only can see the image, without a form or something.
I now tried to set the Background Color and Transparency key to the same color but that results to this:
I also search the web but I didn't found really usefull answers...
So is there another way to do this?
Thanks in advance

Try using png with transparency for image and real transparency for the form by overriding CreateParams to allow transparency.
Provlem on your screenshot is caused by mixing original background color with image. After mixing the color doesn't match transparency key, so you get such border.
The other solution can be to draw the image having no transparency without scaling and antialiasing.

Can I create a transparent background on a PictureBox in WinForms?

I want to make the background of a PictureBox control transparent. In the PictureBox (rectangular shape), I placed an icon (circular in shape). I want to make the icon transparent so that the other portion underneath the icon is visible.
I have tried setting the PictureBox.BackColor property to "Transparent", but it doesn't work. I also tried to set it during runtime with the Color.FromArgb method, but it doesn't work either.
Is there any solution to this problem?

Setting pictureBox.BackColor = Color.Transparent; definitely should work.
Also verify if you are setting alpha channel of color when using Color.FromArgb(0, 0, 0, 0); (this is a first parameter, zero means transparent color)
And, of course, make sure your icons have transparent background.

If using WinForms then Setting the background color to transparent won't work as transparency handling is not a cascading system - you can only (in most cases) set transparency (or rather the opacity) of a control overall using the Opacity property, however this will alter the alpha channel of the entire control display giving your images a see-througness.
One solution might be to set the background color of the PictureBox to be that of the control beneath it (the color of the form, for example). But this may not suffice in your situation.

hi you must set the icon on the other portion underneath the icon by using this
icon_pictureBox_name.Controls.Add(other_portion_picturBox_name);
and after that you can set the PictureBox.BackColor property to "Transparent" and it will work ;)

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 PNG in PictureBox

I am trying to make simple app that allows one to compare image to transparent PNG templates, by dragging the template over picture. For this I need a way to create a PictureBox that will contain the PNG image and be transparent where the the png is transparent.
Everything works fine but the transparency part: When I load a PNG image to the PictureBox (background color is set to transparent) it shows the background color of the containing panel rather than the image that it hovers.
I searched but only found a way to make the PictureBox completely transparent.

It is difficult to make a control that is partially transparent.
What you should do is handle the lower PictureBox's Paint event (the one that does not need to be transparent), and draw the overlay image using e.Graphics.DrawImage(image, x, y). This will draw transparent and semi-transparent images correctly.
EDIT: In response to your comment, there's nothing wrong with calling the Invalidate method in the MouseMove event. However, you will notice some flickering. To solve the flickering, make a control that inherits PictureBox, and call SetStyle(ControlStyles.DoubleBuffered, true) in the constructor.

This works fine if you add the pictureBoxOnTop to the list of controls of the pictureBoxToBeHovered to be hovered.
pictureBoxToBeHovered.Controls.Add(pictureBoxOnTop);
pictureBoxOnTop.BackColor = Color.Transparent;
pictureBoxOnTop .Location = new Point(0,0) ;