c# winForms open forms inside mainform

I have programmed c# application i will post screenshot. In this main form is 3 buttons which open开发者_StackOverflow中文版s different forms. Now i decided to modify this application I want to Make one main form with strip menu which will open this forms. I used this code but i don't like or i'm doing something wrong. I don't like because there is child controls(minimize, maximize, close) in parent (please see second picture ):

Please advice me something. Is MDI good for such job? Thanks!

Sell sell = new Sell();
sell.MdiParent = this;
sell.Dock = DockStyle.Fill;
sell.Show();`

So my problem is that parent form is not filling when i open child form this is creen how to make that it parent form was filled with child form

Seeing your latest edit, I assume the reason that your child form's content doesn't fill the screen even when it's maximized is because your content/layout is not flexible.

Wherever you've placed the controls during Design Mode is where they're going to end up at run time, regardless of how big or small you make the window. If the window is too small to contain all of them, they'll either be covered up or you will see scrollbars. Alternatively, if the window is made larger than necessary, you'll see a lot of empty space.

The way around this is either to set the Dock and Anchor properties of your controls, which causes them to expand and compress to fit the layout of their containing form. You could also place your controls inside a TableLayoutPanel or FlowLayoutPanel control to help manage their layout.

As far as the question you appeared to be asking originally, I still can't tell if you're opposed to the way an MDI application looks, or if you simply don't understand how to correctly implement it. The clarification comment you offered actually makes things less clear to me—you posted a code snippet, but didn't explain what it means. As I wrote in a comment, there's no (non-hackish) way to show a form that doesn't have minimize, maximize, and close buttons (setting the FormBorderStyle property to "None" does this, but I think this is a silly solution that simply allows you to use the wrong control for the job—it won't behave like a form, the user won't be able to move it around like a form, etc. so why use a form?).

If you truly want to have a single application window with changing content in the center, you should create a series of UserControls. You can lay out each user control with the necessary child controls, just like you would with a form (using the fluid layout techniques I discussed above), add each user control to your main form, set each control's Dock property to "Fill" (so that they fill the entire viewing area), and then write code to simply swap out the currently visible user control in your main form's viewing area. The advantage of using a UserControl versus something like a Panel is that you consolidate all of your code into a single control, much like you would with a Form. You could use a tab control, but if you don't want to show any indication that there are multiple forms (which is what your aim appears to be), this would also be the wrong control for the job.

If you literally want to open child forms inside your main form, as your question title indicates, you should indeed be using MDI. If you don't understand how to do this, you'll need to clarify your question further.

Set MDI Container property to true for your parent form. It will help.

Set

FormBorderStyle = None

for your child forms