Re: Treeview add child - C# Discussion Boards

31-Mar-06 21:56

Hi How can I add a child to a node which I know the index of? the only examples I can find are using the "selectednode" property.

cheers

Ed.Poore31-Mar-06 22:04

31-Mar-06 22:04

try treeView.Nodes[index]

Ed

thepersonof31-Mar-06 22:10

31-Mar-06 22:10

Thanks. Now that I've selected the node how will i be able to add a child?

cheers

-- modified at 4:10 Saturday 1st April, 2006

Ed.Poore31-Mar-06 22:18

31-Mar-06 22:18

1) You don't need to select it to add nodes
2) treeView.Nodes[index].Nodes.Add(new TreeViewNode)

Ed

thepersonof31-Mar-06 22:27

Application logic problem

31-Mar-06 22:27

Thank you.

thepersonof31-Mar-06 21:19

Re: Application logic problem

31-Mar-06 21:19

Hey
Basically I have a project with several forms which each need to access teh same instance of the Prog class. Where should I define this instance to make it visible to all forms?

Cheers

Nicholas Butler31-Mar-06 21:33

Nicholas Butler

31-Mar-06 21:33

Hi
I create a Glob class ( Global is a keyword ), then create public static properties for global variables.

internal class Glob
{
    private Glob() { }
    private static Prog _Prog = null;
    public static Prog Prog { get { return _Prog; } set { _Prog = value; } }
}

Some people say that global variables are a bad thing, but like any construct, they are sometimes useful Smile | :)

----------------------------
Be excellent to each other Smile | :)

EasiReports[^] My free reporting component for WinForms.

Re: Application logic problem

thepersonof31-Mar-06 21:39

31-Mar-06 21:39

Thank you, thats great!

Plase help me out !!!

mrkeivan31-Mar-06 20:50

31-Mar-06 20:50

hey guys I have two questions ( sorry if they are stupid ones ...)
1- I have two forms in one i declare a variable
public int number;
Then i assign a number to it and i want to use it in my second forms

firstform ff = new firstform();<br />
messagebox.show(ff.number.tostring());

I don't get the correct number ?!

2- I have a Combo Box, the list comes from a table called StateDB

State_cb.DataSource = StateDS.Tables["StateDB"];<br />
      State_cb.DisplayMember = "StateName";

and it works but i also want to bind it with another table meaning that in my second table called University i have a list of people that are from diffrent universities when my form is loaded I want to have the correct state for that person already selected but it doeasn't work out that way.
State_cb.DataBindings.Add("SelectedItem", myDS.Tables["UniversityDB"], "UniState", true);
Is it possible to do so ??!!

sorry it got so long
Tnaks Smile | :)

-- modified at 2:51 Saturday 1st April, 2006

Ed.Poore31-Mar-06 22:09

31-Mar-06 22:09

mrkeivan wrote:

I don't get the correct number ?!

What do you mean by this?

I'm taking a guess in the dark here but:
You've already got a form which contains a number and you want to get that number from it. The statement:

mrkeivan wrote:
firstform ff = new firstform();

will create a new instance of the class and have a "new copy" of the variable. If you want to access the other instance of the form then you'll have to create a property or field that's accesible to both routines so that you are getting it from the correct instance.

Ed

mrkeivan31-Mar-06 22:55

31-Mar-06 22:55

ok let me light you up , I have to forms, in form one I have a variable called Number
public int User;
in the process this variable recieves a number.
In the second form I need this number for another process, but all i get is either Zero or nothing.

how about the second problem about the combo box can you help me out with that one too ?

Thanx alot
Mr.K

Ed.Poore31-Mar-06 23:11

31-Mar-06 23:11

I still think that it's because you're creating two instances of the form, i.e. you're retrieving the number from a new copy of the form. (Based on your new firstform statment).

mrkeivan wrote:
Zero or nothing.

Eh? For an int zero is nothing

mrkeivan wrote:
how about the second problem about the combo box can you help me out with that one too ?

I don't do that much databinding so can't think of the top of my head and don't have the time to mess around trying things out. Sorry.

Ed

mrkeivan1-Apr-06 0:24

1-Apr-06 0:24

I also think the same, that the problem goes back to creating two instances of the form, so how can i do that, is there any way i can call that form with out creating an instant of it ?
I was thinking about creating a class to hold the data but again i gotta creat a new instant of that clas:(s !?!

Ed.Poore1-Apr-06 8:41

1-Apr-06 8:41

mrkeivan wrote:
I also think the same, that the problem goes back to creating two instances of the form

Why didn't you say you were creating two instance of the form, it's a guarantee that this is the problem D'Oh! | :doh:

mrkeivan wrote:
is there any way i can call that form with out creating an instant of it

Yes, multiple ways, the easiest would be in the form which creates the secondary form, create a public field / property which is accessible to all the method ("processes") which you require. They can then reference the form through them.

Ed

mrkeivan1-Apr-06 9:13