i have 3 forms
form 1 is the main form with some buttons and a menu strip
how can i by pushing a butten open form2 into form 1 (like a website).
i want to have 1 main form , and open all the other forms into the mainform maximised

thx

Look into MDI (Multiple Document Interface) applications.

J

i don't think this is it
i have e few forms whit text and data.
when i puch a button in the menu on the main form , i would like to see one of the form's open in the mainframe , but when i puch an other button the first has to close and the other has to open.
if i puch the same button more than one time , the form has to open only one time

In your first post, you state that you want all of the forms to open in the mainform. This is a characteristic of an MDI. An example of this is Microsoft Excel, Photoshop, etc. Are those applications similar to what you want?

no , i would like that the forms open in the main form.
with MDI the form opens everytime i puch a button , if i puch the same butten 3 time's , the same form opens 3 times.
i would like it like a website.
when i puch a button , the form opens and when i puch an other butten , the first form close's and the other opens.

if possibel

Well, you have to code for that. You will have write code to close the first form before you open the other one...but, I don't know how many times that I can tell you to look into MDI apps.

Do a search on Google and you should find some examples.

i found a few code's , but i get error (childform not defined)


 Private Sub newToolStripMenuItem_Click( _
 ByVal sender As Object, _
 ByVal e As EventArgs) _
 Handles newToolStripMenuItem.Click

     Dim f As New ChildForm()
     f.MdiParent = Me
     f.Text = "Form - " + Me.MdiChildren.Length.ToString()
     f.Show()

 End Sub

Your error message tells you the problem, you don't have a form named "ChildForm". You have to create this form before you can use it as a child form.