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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 minimize a single Windows application form in C#

I have two forms, Form1 and Form2. I currently have a button in the startup form(Form1) that loads up Form2. What I would like to do is have Form1 become minimized and only show Form2 once it is told to load so that Form1 is not in the background while Form 2 is shown.
So far I have tried things such as:
this.WindowState = FormWindowState.Minimized;
but the problem I'm having is that it causes Form2 to become minimized as well. Is there a way to specifically cause only Form1 to be affected or work around this problem?
below you will find my code, I may have made some mistakes!
Form2 add = new Form2();
this.WindowState = FormWindowState.Minimized;
add.ShowDialog();
I had also tried putting the windowstate behind the showdialog but it may not work because it will only execute after the dialog is done working.

Your issue is due to two things.
You're using ShowDialog which launches Form2 as a modal dialog. Hint: Go read about modal dialogs
You need to minimize after showing Form2
Change your code to this:
var add = new Form2();
add.Show();
WindowState = FormWindowState.Minimized;

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;

Child Form is hidden behind MDI Parent Container

When a child form is opened it is hidden behind the title bar of MDI Parent Container.
The Child form's WindowState is set to Maximized. FormBorderStyle is set to None.
If I minimize the MDI parent and maximize it, then the child form comes in to front.
How to overcome this situation?
Edit:
I use the following code to open a child form.
this.childForm= new ChildForm();
this.childForm.MdiParent = this;
this.WindowState = FormWindowState.Maximized;
this.childForm.Dock = DockStyle.Fill;
this.childForm.Show();
this.childForm.BringToFront();
this.childForm.Focus();

Try the following code.
Form1 newMDIChild = new Form1();
newMDIChild.MdiParent = this;
newMDIChild.Show();
this.LayoutMdi(MdiLayout.Cascade);
newMDIChild.Dock = DockStyle.Fill;

The native Windows MDI implementation cannot deal with borderless MDI child windows. Unfortunately, Winforms forgets to enforce that restriction. You can move the WindowState assignment after the Show() call but that causes another problem.
Just don't make it borderless, the border isn't visible anyway.

AboutBox1 ab = new AboutBox1();
ab.MdiParent = MDIForm.ActiveForm;
ab.TopMost = true;
ab.Show();

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.