Making SubForms with MainForm And a Panel

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According to this Page
Use form as subform[^]

i do exactly what the page describes
but in the state of having two subforms or more it doesn't work

suppose i have a MenuStrip having two toolStripMenuItem Page1 and Page2
when i click Page 1 a subForm1 is added but when i click Page2 nothing happens
because the SubForm2 Components Lies behind SubForm1 Components
How can i tell the panel to discard SubForm1 and include only SubForm2
here is the code

C#

private void page1ToolStripMenuItem_Click(object sender, EventArgs e)
      {
          Subform SubForm = new Subform();
          SubForm.FormBorderStyle = FormBorderStyle.None;
          SubForm.TopLevel = false;
          SubForm.ShowInTaskbar = false;
          SubForm.Show();
          SubForm.Dock = DockStyle.Fill;
          this.panel1.Controls.Add(SubForm);
      }

      private void page2ToolStripMenuItem_Click(object sender, EventArgs e)
      {
          subform1 SubForm = new subform1();
          SubForm.FormBorderStyle = FormBorderStyle.None;
          SubForm.TopLevel = false;
          SubForm.ShowInTaskbar = false;
          SubForm.Show();
          SubForm.Dock = DockStyle.Fill;
          this.panel1 = new Panel();
          this.panel1.Controls.Add(SubForm);
      }

Thanks

Posted 16-Dec-14 21:28pm

oula alsheikh

Updated 16-Dec-14 21:39pm

/\jmot

v2

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Comments

BillWoodruff 17-Dec-14 4:15am

I hope OriginalGriff's answer will meet your needs. However, I think inserting a Form inside another Form, or inside some ContainerControl on a Form, is always a very bad idea.

It is like using a cannon to shoot a horsefly.

You can easily use UserControls, Panels, or another ContainerControl object, to host whatever Controls/Code/Classes are now hosted on the Forms you insert.

I encourage to re-think your design.

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OriginalGriff · Accepted Answer · 2014-12-16T21:44:00

No.,that isn't what your code is doing - you are trying to replace the existing Panel with a new version in your Page2 code:

C#

this.panel1 = new Panel();
this.panel1.Controls.Add(SubForm);

That doesn't do what you want, however - because the old panel is still in the Form.Controls collection, not the new one - so the new subform1 is never displayed.
Change your code to just empty the old panel first:

C#

panel1.Controls.Clear();
panel1.Controls.Add(SubForm);

And it should all work.

BTW: You don't need to specify this all the time - you only need it when there is confusion as to which version of two variables with the same name you mean:

C#

private string text = "hello";
private string otherText = "12345";
private void change(string text)
   {
   this.text = "Goodbye";  // explicitly references the class level variable
   text += " there";       // implicitly references the method parameter;
   otherText = text;       // implicitly references class level otherText and method parameter.
   }