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Maximize MDIchild to MDIParent automatically on form load

I am new to WinForms and working on a parent child application. I have created a MDI parent and loading a child form inside it.
Once I select the menu in MDI parent, the child form gets loaded but not fully maximized. I have to manually maximize it to fit the MDI Parent. Below is the screenshot of what I am getting during form load.
Every time on form load i have to maximize it. Below is the code that I am using.
private void newDeploymentToolStripMenuItem_Click(object sender, EventArgs e)
{
NewDeployment nwDeploy = new NewDeployment();
nwDeploy.MdiParent = this;
nwDeploy.Dock = DockStyle.Fill;
nwDeploy.WindowState = FormWindowState.Maximized;
nwDeploy.Show();
}
I want the child form to be loaded in maximised state as shown below. I have searched google but I am getting the same code that I have used.
Is there any other way of doing this? Any help will be highly appreciated.

Thanks to Jimi and Sinatr, I have modified the code by loading the form then modify its window state to maximized.
Below is my updated code
NewDeployment nwDeploy = new NewDeployment();
nwDeploy.MdiParent = this;
nwDeploy.Dock = DockStyle.Fill;
nwDeploy.Show();
nwDeploy.WindowState = FormWindowState.Maximized;

The best way to do this is to set the child form's WindowState to Maximized from within its own Load event. Works every time.

How to remove control box from MDIchild form

When I'm loading a child form in MDIparent the control box also appears. I want to remove the control box and the border of child form.
Also I'm writing code as
private void Form_mainMenu_Load(object sender, EventArgs e)
{
this.WindowState = FormWindowState.Maximized;
this.ControlBox = false;
this.FormBorderStyle = FormBorderStyle.None;
}

If you really want to customize the appearance of title bar of mdiChild Window, it seems you need handle painting of non-client areas of child window by handling WM_NCPAINT message.
Also you need to handle messages like WM_SETCURSOR, WM_MOUSEMOVE, WM_NCLBUTTONDOWN, ... .
As a workaround you can use a panel instead of mdiParent.
Create parent form and don't set IsMdiContainer.
Add a panel to your parent form and name it "ContainerPanel" and set its Dock property to fill.
Create your child form and add it to panel with none border style, no control box, fill dock style and non top level.
Here is sample code:
var f = new ChildForm();
f.TopLevel = false;
f.ControlBox = false;
f.Dock = DockStyle.Fill;
f.BorderStyle = System.Windows.Forms.BorderStyle.None;
/*I assume this code is in your ParentForm and so 'this' points to ParentForm that contains ContainerPanel*/
this.ContainerPanel.Controls.Add(f);
f.Show();
Using such method you can control every aspect of your hand made mdi window. For example you can use a Menu to show list of open windows and a toolstrip to close windows.

MDI child form in Windows Forms

I have a form with an MDI container marked as true. This form is a parent form which has a child form. In the child form I use this code for loading it in maximized size.
this.WindowState = FormWindowState.Maximized;
I use this codes for showing the child form :
Form2 f2 = new Form2();
f2.MdiParent = this;
f2.Show();
And also child form is fixed single so that it won't be able to resize. But however i disable maximize button it will disapper and can be restore down.

Try this:
f2.MinimizeBox = false;

You can try
f2.ControlBox = False;
That could hide both the MaximumBox and MinimumBox but not the Close Button.

Had the same problem, what ended up doing the trick was handling the OnMove event and resetting the visibilities there (even though they are already set to false). Not sure why that works, but it did for me.

Why I got extra close button on mdi child window?

I got a strange problem. My mdi child form has 2 close buttons and 2 maximized buttons.
A screenshot of the problem:
I create the mdi child like this:
summaryForm.MdiParent = ContainerForm;
summaryForm.WindowState = FormWindowState.Maximized;
summaryForm.Show();
If I get rid of "summaryForm.WindowState = FormWindowState.Maximized;", the window style is correct. But I hope to make the mdi child form maximized when created.

It's a bug in Winforms. This will happen when the child is created by the parent's constructor. Move it to the Load event.

try this:
childform.ControlBox = false;

Show MDI child Always on top of other MDI child

How do I show a MDIChild Form always on top of other MDIChild Forms ?
I have set TopMost property of the ChildForm to True, But the form still behaves the same way...
I have tried to set TopLevel property of ChildForm to True and got the error message... "Top-level Style of a Parented control cannot be changed."
How do I achieve this.
Thanks

A better solution that doesn't requiring changing every other form: - declare the new toolbox as a control of the Main Parent (this):
fForm fFormObj = new fForm();
fFormObj.TopLevel = false;
this.Controls.Add(fFormObj);
fFormObj.Parent = this;
fFormObj.TopMost = true;
fFormObj.Show();

The framework apparently does not support MDI child windows owning each other so you have to simulate that behavior yourself:
static Form f1 = new Form();
static Form f2 = new Form();
static Form f3 = new Form();
[STAThread]
static void Main()
{
f1.IsMdiContainer = true;
f2.MdiParent = f1;
f3.MdiParent = f1;
f1.Show();
f2.Show();
f3.Show();
f2.Activated += new EventHandler(f2_Activated);
Application.Run(f1);
}
static void f2_Activated(object sender, EventArgs e)
{
f3.Activate();
}
I generally just make owned forms not be MDI child forms. They don't stay in the MDI container, but at least they stay in front.
Perhaps the reason this limitation exists is because of the strange or ambiguous desired behavior when the MDI child that is the owner is maximized within the container. the above code will allow the owned form to go behind the maximized parent if you click on it in this case. If you have it outside the container, though, then it will remain visible.

//Edit
Since only one of your MdiChild form needs to be focused, try the following:
In the MdiChildActivate event re-focus or re-activate the required window as the activated child window.
You could also use the Deactivated event to enforce the re-focusing of the concerned child window.
When you create the form and show it also append a call to focus method.
ChildForm.Focus()
Setting the focus should make it topmost.
Hope it helps.