Open A Windows Form in Tab Control on Button Click

Question

1.00/5 (3 votes)

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I want to open a windows form on Button click.in a Tabcontrol.
How should I do?
My COde Is Like.........................................
.......................................................................................
if (e.Node.Name == "Node1")
{
TabPage tbp = new TabPage();
childForm.TopLevel = false;
tabControl1.TabPages.Add(tbp);
tbp.Controls.Add(childForm);
tbp.Text = "Main";
//Added form to tabpage
childForm.WindowState = FormWindowState.Maximized;
//if this page is Already Open.............
if (childForm.IsHandleCreated == true)
{
tabControl1.Focus();
tabControl1.TabPages["tbp"].Show();
tabControl1.TabPages["tbp"].Select();

}
else
{

childForm.Show();

}
................................................................................
but this is giving error....Object not set to instance of Object

Posted 19-May-13 21:12pm

DeepakMahiChauhan

Updated 24-May-13 22:23pm

v4

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Orcun Iyigun 20-May-13 3:18am

............... try using google? for such a simple thing.

3 solutions

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Johnny J. · Answer 1 · 2013-05-19T23:20:00

Solution 1

In the button click event, you do:

C#

Form2 frm = new Form2();  //Or whatever your form is called
frm.Show(this);

or (if you want to open it modally):

C#

Form2 frm = new Form2();  //Or whatever your form is called
frm.ShowDialog(this);

Posted 19-May-13 23:20pm

Johnny J.

Updated 19-May-13 23:22pm

v2

Comments

Thomas Daniels 20-May-13 5:21am

+5!

Iris Star 18-Mar-14 1:54am

Very Helpful solution..Thanks...!!!

Mayur Panchal · Answer 2 · 2013-05-24T20:38:00

Solution 2

You also need to add form object in tabpages' control collection as below:

C#

private void button1_Click(object sender, EventArgs e)
{
    Form2 frm = new Form2();
    frm.TopLevel = false;
    tabPage1.Controls.Add(frm);
    frm.Dock = DockStyle.Fill;
    frm.Show();
}

Posted 24-May-13 20:38pm

Mayur Panchal

Comments

DeepakMahiChauhan 25-May-13 2:41am

if this tabpage is already open. then how it will be focused........

Mayur Panchal 25-May-13 2:47am

tabControl1.Focus();
tabControl1.TabPages[0].Show();//If currently other tabpage is selected.
tabControl1.TabPages[0].Select();

DeepakMahiChauhan 25-May-13 4:22am

if (e.Node.Name == "Node1")
{
TabPage tbp = new TabPage();
childForm.TopLevel = false;
tabControl1.TabPages.Add(tbp);
tbp.Controls.Add(childForm);
tbp.Text = "Main";
//Added form to tabpage
childForm.WindowState = FormWindowState.Maximized;
//if this page is Already Open.............
if (childForm.IsHandleCreated == true)
{
tabControl1.Focus();
tabControl1.TabPages["tbp"].Show();
tabControl1.TabPages["tbp"].Select();

}
else
{

childForm.Show();

}
................................................................................
but this is giving error....Object not set to instance of Object

Mayur Panchal 27-May-13 1:16am

at which line, you are getting the exception ? bcz i've tried at my side i m not getting any error.

Basmeh Awad · Answer 3 · 2013-05-24T20:53:00

Solution 3

check this
Tabbed MDI Child Forms[^]

Posted 24-May-13 20:53pm

Basmeh Awad