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Winform Main Control Too Large

I am developing a Winform application which should occupy the entire screen, the target device having 1920x1080 resolution.
The main control window is defined as follows:
MaximumSize 1920, 1080
Size 1920, 1080
MinimumSize 1918, 1078
StartPosition CenterScreen
To fill the screen I have added the following to the _Load method:
this.TopMost = true;
this.FormBorderStyle = FormBorderStyle.None;
this.WindowState = FormWindowState.Maximized;
this.Activate();
When I run the application the Control Window begins at the top left, as it should, but the rightmost 5th and the bottom 5th (approximately) of the form is off the screen. The controls that should appear in the cut-off regions are at appropriate locations (e.g. a label at Location 1712, 551, which should be within the boundaries of a 1920x1080 screen).
Can anyone explain? If I knew why this is happening, I'm sure the solution would be obvious.

I have added the following to the _Load method
Using the Load event handler is the problem. You are changing the layout metrics of the window after it was created. A window is maximized by giving it a negative location and a size that's larger than the screen by twice the border width. So that the border isn't visible.
But your code changes FormBorderStyle and now that location and size is not correct anymore. Since the window no longer has a border. So the window is too large and part of the client area is off the screen.
You must move the FormBorderStyle assignment into the constructor of the form so the window is created with the correct border. Setting the property with the designer is simplest.

It is possible your Windows installation is actually scaling the form. This can be done using the DPI settings (a cut-off of 1/5th sounds like a DPI setting of 125%), or by Windows 10 when it is self-adjusting.
The best thing to do is not rely on screen measurements to be correct. Instead, try to use as much panels that are capable of auto-sizing, like TableLayoutPanel and others. In that way you won't need to keep calculating, instead the framework will do that for you.

How do I change the style of the default title bar(color,shape and font formatting) in forms

I would like to change the style of the title bar and the form in windows forms application using graphics programming.For example the default colour of the form is blue ,I wanna change it to black.Has anyone got any code or tutorials how i can implement that.Thanks in advance

I suggest looking at this links
http://www.codeplex.com/wikipage?ProjectName=CustomerBorderForm&title=Painting%20NonClient%20Area
http://www.codeplex.com/wikipage?ProjectName=CustomerBorderForm

set form border style to 'None' FormBorderStyle = None
add a Titlebar "Panel" with a Button in the top Left for an Icon, and the Three Control buttons at the top Right and dock it to the top
You can 'borrow" the windows Control Menu but that is outside the scope

Resizing the form elements on resizing the form

how to Resizing the Windows form elements on resizing the form? is there any way to set the width of picturebox, panel, etc 100% like CSS? suggest me some help for best practices of layout? When i resize the Windows form, I want that Image size also change when i resize the image. like Windows Picture Viewer

You would probably be okay with the Anchor property of the controls.
http://msdn.microsoft.com/en-us/library/system.windows.forms.control.anchor(v=vs.71).aspx

You should look into Control Docking, it'll probably suit your needs.

What you may want is to set the properties of the image control to fill the image inside.
Steps:
I created a new windows form
I added a picture box to the form
I set the picture box "Dock" property to "Fill"
I added an image to the picture box
I set the SizeMode property to "StretchImage" ("Zoom" might better fit your needs")

Shadow to windows form

I am working in C# Windows Forms Application
I want to make shadow of my form, so I have taken a image having shadow and set it as Form's Background image and also set TransparentKey to Form's BackColor i.e. Control Color, so that it will transparent the area which contains Control color and FormBorderStyle to None.
My problem is that I am not getting the shadow transparent, it is of Control Color.
Updated: I also want to change shape of my form

I would use this technique instead; it worked beautifully for me.
Drop shadow in Winforms Controls?
Update:
Changing the shape of a form is easier than you'd think.
Follow this tutorial: http://www.codegod.de/WebAppCodeGod/creating-custom-shapes-for-forms-in-windows-forms-AID377.aspx

Create a System-tray styled box in Winforms (C#)

I've been hunting about for some resources on this, and I can't find any, so I'll bring in here.
I want to make a window similar in style to the quick launch box which you see when you open the quick launch bar:
Example Window http://img63.imageshack.us/img63/6204/volcontrolstyleguide.png
Sadly, I can't find any resources on this; can you help me out?

It's quite simple. Create a new form, and set ControlBox, MaximizeBox, and MinimizeBox properties to false. Set the Title property to an empty string. This will effectively eliminate the the nonclient title bar area, giving you this:
The the interior section (like with "Customize") can be duplicated with a properly sized Panel and Link.

Assumptions :
this is a fixed size form, never re-sizable
you want this to work on XP as well as Vista (i.e., without using Vista specific techniques like 'Glass). I mention this because, after all, the System Tray does go back to the late paleolithic :)
Here's how :
create a Form the same size as your .png file
set the ControlBox, MaximizeBox, MinimizeBox properties to 'false
set FormBorderStyle to 'None
set the transparency key of the Form to some color, and set the background color of the Form to the same color : note use a color that does not occur in the .png file.
put a PictureBox on the Form, set its Dock property to 'Fill : set its Margin property #0 for all Margins : set its BackColor to 'Transparent : then, naturally, set the Image property of the PictureBox to your .png file.
NOTE :
If you have prepared your .png image so it is bounded by a transparent area so that it appears rounded : you can use that directly and skip over the whole step of actually making the Form a Rounded Rectangle by use of an API call to set the Region of the Form : this does mean your Form will have a standard rectangular bounding box. If you can live with this : this is a simpler solution. For how to set the Region : read on ...
see "How to make form rounded rectangle or round or triangle" here on SO for how to set the Region of the Form to a RoundedRect : this SO entry has several other links in it to code examples : the link mentioned by Zyphrax here uses the same basic technique.
experiment with the settings to the 'CreateRoundRect to get the rounded corner effect you want.

That sounds like you need Windows 7 API Code Pack, in which some API's are backward compatible with Vista. Since the specific version of Windows is not stated, I cannot say specifically..you could look here and here on CodeProject how this is accomplished.
Hope this helps,
Best regards,
Tom.

You can take an normal Form and modify it to look like your screenshot:
Set the FormBorderStyle property to None
Round the corners of your form: more info here
(Extend the glass if you like: more info here, only Vista or higher)
Set the background to White and add some controls to finish it off