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App has too many tabs opened in the task-bar

I'm making a WinForm app in C# (Visual studio) for fun. I came across a low-priority problem. It doesn't affect how the app works. But...
On the starting page, I have a button to open a Form1, inside Form1, there's a button to open a Form2 and so on.
At runtime, when I open a form, its parent form does not close and every form is a separate tab in the task-bar. As the layers grow, I'll have more-than-acceptable amount of tabs down there...
Is there a way to have only 1 tab?
I've tried:
Adding a parentForm.close() line when opening the form, but that was bad.
Instead of creating another form, putting everything in a panel, and bringing out another panel using code, but if there are too many layers, the code gets ridiculously long.
There has to be a simpler way right? Please shed some light.

Yes, you have a property in every form called ShowInTaskbar which is true by default. You can change that in the form properties under Window Style section or changing it by code manually:
Form2.ShowInTaskbar = false;
Form2.ShowDialog();
Configure to false all forms but the first one in order to achieve your desired behaviour.
Make sure your opened forms are dialogs or you are put them on top so user can never get in the situation where the form is behind and they cannot close it.
Anyway, with a proper form parenting configuration (if it fits your needs) you won't need this, as children forms won't appear in the taskbar.
If a form is parented within another form, the parented form is not displayed in the Windows taskbar.
Make sure you check the MSDN Documentation about this.

How to create moving toolbars in windows form C#?

Backgound :
I want to create moveable toolbars just like paint.NET or any other Designing application. A Toolbar which can be moved, closed and shown from the menubar.
i know how a toolstrip works but its permanent sort of thing. There is another way explained in some articles which uses panels to make toolbars.
While doing experiments on the toolstrip, idea came up in my mind to make two forms(one big size form and other small form) and run them simultaneously , one will act as main form and the other small form will act as a toolbar but it also didnot work. I am only able to run one form.
Requirement:
I just want to make an application look like Paint.net having different tools in a toolbar which can be used on drawing area.and when application starts, toolbar and drawing area both should be running just like in all graphics editing softwares.
Questions:
How to make a moveable toolbar that can be closed and viewed again?
How to run two forms of different sizes run simultaneously at the same time when application starts?
Note:
Need Guidance as well if i am not in the right direction, u can set my direction towards the right side.
Thanks

Multiple forms or one form and add controls

I am creating a windows mobile application that has several different screens. At the bottom of each screen is a menu bar which the user can click on to navigate each screen.
My question is should I use a new form for each screen and clone the menu or use one form and have all the other screens as a control and add them to the main form?
Cheers

I'd vote for controls.
Both mechanisms can achieve the flow you want, and from a fundamental perspective neither is going to really be worse (as in load times, memory consumed, or what have you) so it's largely a personal style decision. Me, I use a UI framework that lends itself heavily to UserControls, so that's what I use.
Generally speaking, when I create an app I have a single parent/host form that has Workspaces where I put my Views. Thos Views are UserControls. Whether I use a tabbed workspace or a desk workspace, they still end up as Controls. The only reason I use more than one full-up Form is if I have a dialog (warnings, inputs, etc) where I will be doing a ShowDialog call.

Per this link, there is no MDI functionality in Windows Mobile.
In our application, we use different forms for each screen.
There are two ways to open up new windows:
formName.ShowDialog(): the new screen will be opened as a child of the other screen. In this case, you won't be able to access your parent form until the child is closed.
formName.Show(): the new screen will NOT be opened as a child of the other screen. Hence, you can access your parent even if the child is not closed.

You can use TabControl in single form with each tab having it's own controls. No need to add controls dynamically. And one single form. The way to achieve this is discussed in more detail in this answer.
Creating Wizards for Windows Forms in C#

Prevent other windows from overlapping my form?

I have a form that is on the 2nd monitor and full-screen. I want to prevent all other windows from accidently being moved into the second screen and over lapping my form.
I also need to make sure that if a window gets moved to the other window and I use topmost, I don't want the other window to get lost.
I want to make the 2nd monitor( or my app ) un-overlappable. Not necessarily make it the topmost app.
This is a c# form.
What would be the best way to do this?

Form.TopMost property:
A topmost form is a form that overlaps all the other (non-topmost)
forms even if it is not the active or foreground form. Topmost forms
are always displayed at the highest point in the z-order of the
windows on the desktop. You can use this property to create a form
that is always displayed in your application, such as a Find and
Replace tool window.

Best way to prevent window cluttering in my MDI application

I'm currently designing an MDI application (a custom CRM) in .net 4.0 and i'm starting to dislike the whole interface simply because there's no real way to track which windows are open or closed and it'll probably lead to a very confusing interface.
What is the best way to avoid this?
- Should i implement a taskbar to track every open mdi child?
- Should i use dialogs instead to prevent multi-tasking?
- Is there any way to change the size of a minimized window on a mdi container (why are they so small, you can't even read the full form title that way...)
Sorry for so many questions, thanks in advance.

MDI has its uses, but as you've found can easily lead to a cluttered, hard-to-use interface. The current in-vogue way of dealing with this is to add a tab control (as in any web browser, or most text editors/IDEs) to allow switching between open views. This is close to a task bar I guess.
Other options are controls like the Outlook bar (the big view chooser down the left-hand side of Outlook) or possibly just a simple list box with the currently open views.
Alternatively, consider how often you really want multiple windows available and whether most of them are "tool windows". If so, perhaps look at using docking windows for these tool windows, and a Single Document interface for the rest of the app. All depends on what you're actually doing!

The MDI windowing management already has the built-in to track open windows by way of the menu. The ToolStripMenu has an MdiWindowListItem that you can set to a reference of the menu item that will contain the list of open windows. If the menu is attached to the MDI parent window, child windows automatically populate the menu item.
One of the objectives of MDI is to allow multitasking. If that's not what you want, use a different design.
As far as changing the size of the minimized windows, apparently it's not possible using the standard Windows interface. See more info here: Is it possible to change size of minimized window in MDI C# Winforms. But you could remove the standard Minimize button, add your own, and do what you want with the windows in a Normal state.