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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.

MDIChild toolbar displays in MDIParent

I have an MDIChild that has a toolstrip. When I open the window the toolstrip is displayed alongside the toolstrip of the MDIParent. The searching I have done suggests that this is normal behaviour unless the child is opened modally. Can I not stop this from happening and fix the toolstrip to the window it is meant to be displayed on?
This is the MDI Parent
This is the MDI Child
This is what happens when I open the child and what I want to stop happening.

Set the AllowMerge Property of the MenuStrip of the Child form to false.
From MSDN
Use the AllowMerge property to enable multiple-document interface (MDI) children to combine their respective menus in the MDI parent.
When this property is set the true, the menus will combine (just like in your case). When false, they won't

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.

c# Add HelpButton to a MDI child form at run time

i'd like the following code to work (where this. is a MDI child form)
this.HelpButton = true;
this.HelpButtonClicked += HandleHelpButtonClicked;
this.Refresh();
this code is being called after the mdi child form is displayed.
I wonder if i need to find some way of redrawing the title bar?
David

From the MSDN docs:
The value of the HelpButton property is ignored if the Maximize or Minimize buttons are shown.

C# - How to deal with 2 "TopMost" Forms?

I have a parent form that is set to be TopMost and then I have another form that opens when a button is clicked. This child form is also set to be TopMost. The first issue I had was that when I opened the child form, the application would basically freeze because you couldn't access anything. I decided that instead of using ShowDialog() to open the child form, I would use Show(this). This did fix the initial problem but now I have a new one. The childforms start postition is set to be CenterParent and when I use Show(this), it doesn't work. Is there any way I can make the childform open while both it and the parent form are set to topmost while having the childforms start position set to CenterParent? Thank you.

I've find something useful to share with you, guys. Instead following code
form2.TopMost = true;
use this code in main form:
form2.Owner = this;
If you use Form.TopMost property, the form will overlap all other non-topmost forms, but also those from other applications. Instead of this, set the Form.Owner property to the parent form – the one which should be under the form (e.g. the main form).
G00d luck :)

You could try clearing the TopMost property of the parent form for the duration that the child form is visible.
This would solve the problem of which form should be top most, as there will only ever be one.

Hmm. I've created To forms. Then i set TopMost = true on both. The i add button to first and wrote
new Form2().ShowDialog();
And all just fine. Form2 active and clickable. Form1 not since ShowDialog was called
And second variant works fine. Form2 opened in center of the screen.
May be i misunderstood something?