add child node from another form

Question

1.00/5 (1 vote)

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I want to add child node to parent node of treeview from another form.
I tried this code, this is executing but not adding a child node.
tree view is in form 1. I want to add child node from form 2, textbox value in button ckick event. I did like this

C#

foreach (Form f in Application.OpenForms)
{
    if (f.Name == "form1")
f.controls.contains(treeview1.Nodes["Market"].Nodes.Add(Textbox1.text));
}

can u let me know the problem

Posted 5-Jan-14 12:14pm

hussain548

Updated 5-Jan-14 13:39pm

v2

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Comments

CHill60 5-Jan-14 18:18pm

You are creating a new instance of form1 instead of finding the current instance that you already have

hussain548 5-Jan-14 18:23pm

Ok sir I got your point but how to get current instance?
I know this is silly question but I am new to0 c# so don't min fr this typ0e of question

CHill60 5-Jan-14 18:51pm

No problems - I couldn't actually remember!! I've posted a solution now

BillWoodruff 5-Jan-14 23:03pm

It's obvious your code sample will not compile (for several reasons), and I think it's important that when you try to learn a language you do it in the development environment, and actually try executing the code.

That way, as you fix syntax errors, and, perhaps, look up operators, etc., you "learn as you go."

Key information here is:

1. where is the "other" Form created ... in Form1 ?

2 solutions

Solution 1

OP is creating a new instance of form1 so the original never gets updated.

Find the current instance that you have loaded by using Application.OpenForms

E.g.

C#

foreach (Form f in Application.OpenForms)
{
    if (f.Name == "form1")
        //Do something
}

Posted 5-Jan-14 12:50pm

CHill60

Comments

hussain548 5-Jan-14 19:09pm

I appreciate or your help.
foreach (Form f in Application.OpenForms)
{
if (f.Name == "form1")
f.controls.contains(treeview1.Nodes["Market"].Nodes.Add(Textbox1.text));
}

Sir,I did like this but error at treeview 1. I did any mistake sir plz can you help

CHill60 6-Jan-14 7:37am

Ho hum ... downvoted again

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Adam Zgagacz · Accepted Answer · 2014-01-05T16:24:00

Try something like below. This code will work properly if there is no more than one treeView located on each open form.

My logic is not difficult to guess. I'm iterating all controls belonging to child form and if I find TreeView control I'm updating "Market" node.

C#

foreach (Form f in Application.OpenForms)
  {
      if (f.Name == "form1")
      {
          foreach (Control ct in f.Controls)
          {
              TreeView treeViewToUpdate = ct as TreeView;
              if (treeViewToUpdate !=null)
                  treeViewToUpdate.Nodes["Market"].Nodes.Add(Textbox1.text));
          }
      }

  }