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A process on a single win form window

I am developing an application in Windows Form C#, it begins with an explanatory window, language selection and a start button when the desired language is selected, I want that when I press the start button, all the elements disappear and begin the application process, I had thought of creating a new form, but this opens a new window and I don't want that, I want everything to happen on a window. Apart from making all the previous controls invisible, is there any way to achieve this? Or maybe a way to make all the controls invisible without going one by one?

You could put multiple controls in a panel for example and hide/show entire panel.
If you dont want to do that, you could always do it in a loop
for example:
foreach ( var control in this.Controls)
{
control.Visible=false;
}
Ofcourse you could also add controls dynamically, but that might be hard for a beginner.
You could also make use of MDI forms, but that might be also not worth it.

SOLVED
Solved using user controls, user controls allow me to design the application interface in the same way as a form and I can add and remove that control from the form as many times as I want, making it possible to display numerous interfaces in a single Windows Forms window.
This solution was suggested by Jeroen van Langen in the comments of my question and it was exactly what I was looking for.

How do i add another components on the MainWindow?

Struggling, I need a button to open up a window but below the MainWindow in C#. Like in a website you can open other pages but the master page layout doesn't change only the page you are viewing shows differently.
I need similar thing. I have components (tools i added from toolbox) on my MainWindow.xaml so for example if i click on a button i named new student, a tabbed-window where i can capture student details must appear but it must not be a separate windows it must appear within the mainwindow and seem like a one thing. Forgive for my English. I hope someone will understand me though, thanks in advance. I want to have components/functionality according a specific button click but constant Mainwindow, the one with "File" "Edit" "View" "Help".

There are a couple different solutions to you problem, but Visual Studio doesn't quite have something like the Master View option through ASP .NET with webforms.
Option One
Using TabControl. This option is the easiest solution to your problem. The GUI in Visual studio has support for adding components to each tab, which nothing else has. This is the closest component to something like multi-panels in Java, but it will still create the Tabs, which may not be what you are looking for.
Option Two
Using multiple Panels over one another. With this option, you can add multiple panels to your main window and layer each panel over one another. You can add a button or other control which will hide each panel and all of its contents. This is a great solution if you don't want tabs, but it can be frustrating to create in Visual Studio since you must move each panel away from another in order to add/remove/adjust the components on the underlying panel.
Of course there are still a few more controls you can use to produce the results you are looking for, but these are probably the most applicable solutions to your problem.

Visual Studio C# 2010 adding/editing new additional forms to a program

So I am new to actually building GUI and I am creating a project where when you click on one button you open a new form. With this new form I want to be able to add and edit things to it.
In my solution explorer it is only showing the first form that I originally create, not the second one. I went online and used one of those little microsoft blurbs about creating a new form when a button is clicked, and I am a little lost from there.
My program is going to have multiple buttons that you click and they open certain forms. I understand that I have the button_click set to create a new form. I now want to know how to edit these forms that are created.
I tried refreshing my solution explorer and it wouldn't show my newly created design. (I thought that could be one of my possible errors, haha) Could someone please let me know what I should be doing?

First add a new form. Right click on your project (my project is called Test) and give it a name (I called it TestForm):
Then, add the following code to your button:
TestForm MyForm = new TestForm();
MyForm.Show();

Using popup windows in Visual Studio C# and ASP.NET - quick learning

Whenever the "Reserve" button is clicked in my web application (ASP.NET with C#, Visual Studio), a small window should pop up containing detailed options to choose from (drop down lists with values, comboboxes, etc), with a "Next" link, and "Finish", in the end. Changing the values in these controls should update tables I have in the database (Microsoft Sql Server).
Could you point me towards a detailed and useful resource/example of this? I am already using a book for inspiration (Cristian Darie) written in the form of steps / explanations, but scenarios as just described are not included. What should I be looking for? "Using Pop up windows with Visual Studio"? Is what I described known as a popup window?
I don't know JavaScript, is that needed here? Been practising lately a lot with classes, methods, stored procedures, masters, user control type files, handling db tables through Visual Studio classes and methods, etc but still new to these (a month old basically). Thanks a lot!

it's not necessary to use JavaScript, but if you want anything a bit more fancy than just a regular popup window, javascript will be a good friend to you. As I see it it's basically four main ways of doing it:
1
Create a new ASPX file with the "details", send a querystring to the url of the details view in order to connect the popup with the data from the main window. a key to this is the "target" property of the html "a" tag. For example:
Details
2
Create a popup window with some custom properties (i.e toolbars window size of popup etc) using regular javascript. Look for window.open in javascript.
Example:
Details
3
Using jQuery to open the popup in a modal dialog fashion using a lightbox. For this alternative I don't have any example, but google jQuery lightbox, there are heaps of them. Use that with an AJAX-call and achieve your goals.
4
And at last, use ASP.NET AJAX Control Toolkit (look here:
http://www.asp.net/ajaxlibrary/act.ashx) Download and install, use the ModalPopupExtender (tutorial here: http://www.asp.net/ajaxlibrary/act_ModalPopup.ashx) from the toolkit, in which case you design your "details" view in a <asp:Panel> control and then using CSS and the ModalPopupExtender to display and hide the details, the looks will be like the lightbox but you don't have to create a separate ASPX page for this option, but you can use the same ASPX.
I've worked alot with all four options, and i tend to like the 4th alternative the best, but we all have our own taste.
Good luck, and feel free to ask away for more detailed information. :)

let's take this step by step. In order to send that information, I think the
easiest way would be to store the parameters as session variables and then reload them
when the popup is closed, you can reload the parent window using the "onunload" event in
Javascript, for example
<body onunload="window.opener.location.reload(true);">
This would in
itself reload the parent window whenever the user closes the popup. IF you want it to close
when the user saves changes (and your session variables are set), use this code in order to reload
the parent window and close the popup. Put this code in the code behind, just before the
end of your method that saves the data:
Page.ClientScript.RegisterStartUpScript(this.GetType(),"close","<script language=javascript>window.opener.location.reload(true);self.close();</script>");
To learn javascript, have a look at codeproject.com, they have a lot of articles regarding
javascript (among other things), often with example code. :)
I made a quick example here: http://www.4shared.com/zip/LPtR1gbx/pop.html

I would recomment using a <div> element rather than an actual new browser window.
It eliminates the need to pass the contextual information from the pop-up window back to the original window along with all the complexities involved with it (including things like the user inadvertently clicking off the pop-up window, clicking multiple times and thus bringing up multiple copies of the pop-up window, and so forth).
By using a <div> that "pops up", via controlled visibility through CSS or JavaScript, the entire context is kept to the same web page, making life so much easier overall.

.NET WPF application UI structure

I'm fairly new to WPF and .NET in general. What I am trying to do is to create an application that has multiple forms. My question is that how should navigate through these forms?
Imagine there are 10 forms and each form has a button on it saying "Next" and upon click, goes to the next form, except the last form which terminates the entire application, like an installer if you will.
What should the "Next" buttons do? Should they create a new object of the next form and close the current form? I noticed this has a closing/opening visual effect which made me realize maybe I'm not doing it right.

What you need is a Wizard like approach.. look at this thread
Developing wizard UI - WPF