how to set Tabpage index in Tabcontrol

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Hi,

Can anybody tell me how to set the Tabpage index in tabcontrol.
When i was adding a new tab to a tabcontrol and moving it to front. the indexes are not changing.

Thanks with regards,
Gani.P

Posted 2-Aug-11 2:49am

Gani.P

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2 solutions

Solution 2

The index is set automatically when you fill the TabPages property:

C#

//page1 will receive index 0
tabControl1.TabPages.Add(page1);
//page2 will receive index 1
tabControl1.TabPages.Add(page2);
//page3 will receive index 2
tabControl1.TabPages.Add(page3);

If you want to change indices, just change the add order:

C#

//page2 will receive index 0
tabControl1.TabPages.Add(page2);
//page1 will receive index 1
tabControl1.TabPages.Add(page1);
//page3 will receive index 2
tabControl1.TabPages.Add(page3);

Or as OriginalGriff said, you can use the Insert method for example.

Using BringToFront will not help there.

Posted 2-Aug-11 3:00am

Olivier Levrey

Updated 2-Aug-11 3:16am

v2

Comments

OriginalGriff 2-Aug-11 9:01am

I'm afraid that isn't true: the TabPages property is a normal List, and so you can use any IList functions which affect the index: Insert, DeleteAt, etc.

Olivier Levrey 2-Aug-11 9:15am

I thought TabPage had a readonly Index property but I was wrong. Hence, my answer was not clear: I meant this readonly property would be set automatically...
I didn't mean the list can't be edited as you said.

Olivier Levrey 2-Aug-11 9:17am

I corrected my answer. Thanks for that.

OriginalGriff 2-Aug-11 9:25am

You're welcome!

Sergey Alexandrovich Kryukov 3-Aug-11 1:39am

Good point; good answer -- after correction. My 5.
--SA

hadi.khkosrawzade 17-Mar-12 18:42pm

thank

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OriginalGriff · Accepted Answer · 2011-08-02T03:00:00

Solution 1

Use the TabPages.Insert method instead of Add:

C#

TabPage tb = new TabPage("Hello");
myTabControl.TabPages.Insert(0,tb);

Posted 2-Aug-11 3:00am

OriginalGriff

Comments

Olivier Levrey 2-Aug-11 9:00am

Good too. 5.

Aydin Homay 28-Oct-13 5:22am

Dear OriginalGriff
Your answer is not complete because you can not add new tab page with these cods you should
read TabControl handle before than !!!!!!!!!
TabPage tb = new TabPage("Hello");
IntPtr h = tabControl1.Handle;
tabControl1.TabPages.Insert(0, tb);
Yes it is a bug in Microsoft Tab Control

Sergey Alexandrovich Kryukov 3-Aug-11 1:39am

Correct, a 5.
--SA

OriginalGriff 28-Oct-13 5:28am

Um. Yes you can...it works fine for me, and has done for many years...

Aydin Homay 28-Oct-13 6:09am

No you can not!!! you should read handle of TabContorol before the inserting new TabPage please check your code ;-)

Aydin Homay 28-Oct-13 6:11am

However it is non of your business, it is a Microsoft Problem

OriginalGriff 28-Oct-13 6:23am

I'm afraid you can. Try it. Drop a TabControl on your form, and a Button::
int i = 666;
private void button1_Click(object sender, EventArgs e)
{
TabPage tp = new TabPage(i++.ToString());
tabControl1.TabPages.Insert(0, tp);
}
It will work fine...everytime you press the button, you get a new tab page.

Aydin Homay 28-Oct-13 7:28am

Ok test this code ;-)

public Form1()
{
InitializeComponent();
TabPage tp = new TabPage();
tabControl1.TabPages.Insert(0, tp);
}
Your code can add because you used button event in other words you are done initializing process ;-)

Aydin Homay 28-Oct-13 7:30am

you can see this link to the get more information

http://social.msdn.microsoft.com/Forums/windows/en-US/5d10fd0c-1aa6-4092-922e-1fd7af979663/tabpagesinsert-bug?forum=winforms

OriginalGriff 28-Oct-13 7:53am

Of course you can't do it in the form constructor! There are loads of things you can't do in the constructor because the window initialization isn't complete.
That is what the Form.Shown event is there for!

Aydin Homay 28-Oct-13 8:27am

Exactly, So I think maybe you need to the change your solution, because your solution is not clear and we don`t know where we should use it, from every where at code or just after finalizing window events.

OriginalGriff 28-Oct-13 8:42am

Should I also add that it won't work on a web page? Or on your iPhone? Or as a Windows Service? Because it won't!

No. Just because you don't know where to put code so that it stands a chance of working does not mean I should add loads of comments to cover the solution for cases it was never intended to meet. I'd never finish writing one of them! :laugh:

Aydin Homay 28-Oct-13 8:58am

:laugh: ;-) good job