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can form Contain another form in winforms application?

i want to make one form contain another form ;
For the sake of browsing different sub-forms in the same Parent Form using parent controls .

You can use a TabControl to group different controls together, however if you REALLY need to have a subform, you can use MDI forms.
This is a tabcontrol:
It basically has a groupbox for each individual tab, so you can add and remove as you please.
From the docs for tabcontrol:
A TabControl contains tab pages, which are represented by TabPage
objects that you add through the TabPages property. The order of tab
pages in this collection reflects the order the tabs appear in the
control. The user can change the current TabPage by clicking one of
the tabs in the control.
And MDI:
Multiple-document interface (MDI) applications allow you to display
multiple documents at the same time, with each document displayed in
its own window. MDI applications often have a Window menu item with
submenus for switching between windows or documents.

Solution is to set the parent form property
IsMdiContainer = true ;
and set child forms with
childForm.MdiParent = parentForm;

I believe that you are looking for TabControl in C#. This allows to to browse through different tabs in the same parent form. You may refer to TabControl in C# for more information.
Hope this helps.

Create controls dynamically or create controls in a side form? C# winforms

I have a form full of controls, and there is no room for other controls. On the bottom of the form I have a panel with some controls on it.
My goal is that when a certain button is clicked, the original panel on the bottom will be replaced with another panel that contains controls which could be created before the program starts, meaning these controls in the panel do not need to be created dynamically. The replace action would be executed by setting each panel's visible field to it's matched value.
I have thought of two ways of doing this - either creating the new panel (and it's controls) dynamically and adding it to the form instead of the original, or creating the new panel in another form and when the relevant button is clicked the panel being taken from that form and added to the required form (by creating an instance of the new form and making it's panel's modifier public). The "side form"'s purpose is only to create that panel, it has no functionality of it's own.
The advantages of creating the new panel dynamically:
There is no need to create a zero-functionality form.
The advantages of creating the new panel in a side form:
It's very clear which controls are added to the new panel and their positions.
It's very easy to set the location and other fields of the controls in the new panel.
Which way is better?
Thanks!

Have you considered TabControl? That seems a good fit for your needs. Other controls I can think of are StackPanel (Can be fairly easily done for Windows Forms) or OutlookBar like control (again a user control).
Simplest and quickest way seems to be TabControl.
Edit:
SideForm is a different windows form I suppose. So if you are thinking to make controls public and then change their visibility etc, please don't. Use delegates to handle SideForm's events in MainForm.
As you mentioned, there is no room for more controls, I would suggest more screens rather than just one. Having said that I do not know much about your current UI design and functionality so it's up to you.
I would say having the controls hidden and just playing with the Visibility is fine. This means that you do not have to worry about positioning of controls, anchoring and docking at runtime. The problem could well be loading of form. Having huge number of controls having a lot of data associated with them may slow things down.

IMO the best way would be to utilise user controls for this purpose. Simply create one user control per panel you wish to show/hide and place your controls inside. This way you will have both: the designer and the "extra form" you wanted.

Hosting a Form's content inside of another Form?

I need to host a Windows Form inside another Form, like an iframe in HTML. However, using a Multi-Document Interface causes the Form's window controls to be rendered as well. I need only the content of the Form to be rendered. How would I do this?

Look into UserControls. They will accomplish what you want.

I have an application like this.
For the contained form, I set .TopLevel = false, the formBorderStyle to none and I also set the Dock property to Fill.
In my parent form, I have a split panel and I just add my contained form to the the panel I want it in.
I don't remember exactly why I didn't want to go with UserControls any more, it was years ago. I seem to recall having a reason though. Some of my contained forms use UserControls.

Why don't you make each game a separate UserControl?

Inconsistent behaviour when attempting to highlight C# TextBox

I'm building a C# WinForms program, and my textboxes do not allow the user to highlight the text consistently throughout the program.
In some places, the highlighting works normally: you type something in the box, click and drag over some text, and it highlights where you dragged.
In other places, clicking and dragging does not select the text. The only way to do it is by double clicking on the text.
I haven't changed any default properties of these textboxes or messed with any event listeners. I placed brand new textboxes in different places, and they behave differently.
I'm wondering if it has something to do with the properties of the Form the TextBox is contained in, since it seems to appear that either all textboxes in a particular form work, or none do. However, as far as I can tell the properties look to be the same across the board, and I don't ever remember changing anything.
To me it seems like it's happening randomly. I can't find any information on the topic. Does anybody have any idea what I'm talking about?
EDIT: Ok, I figured out where the problem lies, but I still don't know how to fix it.
It happens only in forms which have been added to a SplitContainer in my main window like so:
myForm.TopLevel = false;
this.splitContainer.Panel2.Controls.Add(myForm);
myForm.Show();
EDIT 2: I now know that this is the same issue encountered here: Windows Forms: Unable to Click to Focus a MaskedTextBox in a Non TopLevel Form . The accepted answer isn't useful to me, and the other answers seem impractical, since I'd have to add event handlers to every single textbox...

I had the same problem today. I tried changing TopLevel as others have suggested. This didn't work. Somewhere along my search I saw a suggestion to create a click event for the text box and use it to force focus on the control. This made no difference either. There were no events that should intercept and block a click event. It was just an MDI child with a few controls on it stuffed inside a panel on a split container. I couldn't highlight text in textboxes or textbox-derived controls though.
Turns out the solution was to switch the order of childform.Show() and panel.Controls.Add(childform). If you add the child form before it is shown, you apparently cause this bug.

I'm a little perplexed at what you're trying to accomplish. I'm used to using a user control if I want to embed something on a SplitPanel, and using an MDI form if I want child forms.
Do either of these approaches work for you, and if not, can you explain why not/what you are trying to accomplish?
Thanks!
James
* Edit *
You can add a panel (regular panel, not a split panel) to an MDI parent form and dock it to the left. Add whatever you currently have in the left panel of the SplitContainer to this left-docked panel, instead. Now you can instantiate forms, set them as children to the main MDI parent, and have all the window functionality you're looking for... You can maximize them, and they will fill the right-side of the MDI parent; you can pick cascade or tile from the window menu, etc.
If you want to let the user dynamically resize the left panel, drop a splitter panel into the right-hand portion of the main MDI form container; it will dock left by default, and show up to the immediate right of the panel. Now when you run, you can drag the border of the panel to resize.
Remember, an MDI form is like any other form... you can add any control you want to its surface, and .NET is pretty smart about how it incorporates the child windows.
If you're still not sure of what I'm trying to describe, I'll try to find somewhere I can drop a sample project... because everything is really done in the designer, there's not really any code I can show you. Here's the code for creating a form as an MDI child (running from within the MDI parent):
MyForm frm = new MyForm();
frm.MdiParent = this;
frm.Show();
That's all there is to it.
HTH!
James

C# Adding tabs at runtime using Form's controls

I have thought of this idea where you could have a tab control on a form, but instead of defining each tabs controls before runtime, inherit or use another form's controls.
Basically a tab control is in place on the main form that has no tabs on it before runtime. When runtime comes along I want to create tabs, but the controls that would be on each tab would be from seperate already created forms.
Each form would be a seperate tab that had been created prior to runtime.
Is this possible? Is so, how?
Thanks in advance
EDIT
I'm using 3.5

first create a User Control and design it as you would a regular form, then add it to your TabControl.TabPages
TabPage page = new TabPage("Title");
page.Controls.Add(new CustomUserControl()); //your user control
this.tabControl1.TabPages.Add(page);

If all you'll be doing is copying controls from a TabControl on one form to a TabControl on another form:
Instantiate the form you want to copy from
Find the TabControl on that form
Iterate through Controls on the TabPages inside that TabControl
Add each Control you find in that collection to the tab(s) in the control you want to copy to
Close and Dispose of the form you created in step 1

Yes, it is possible. You have to add the controls onto the TabPage, then add the TabPage to the TabControl.TabPages