How to remove RichTextBox with Button generated dynamically?

Question

I am generating a RichTextBox and a button with another button. When the generated button is clicked, I want to delete the RichTextBox and itself.

static int i = 1;

private void generate_Click(object sender, EventArgs e)
{            
   RichTextBox text = new RichTextBox();
   Button delete = new Button();

   this.Controls.Add(text);
   this.Controls.Add(delete);
   i++;
}

You can set the name for the control to something the delete method can use to find the control later using Find(). You can also store a reference to the control in a class member that the delete method can use. — itsme86
– itsme86, Commented Jan 7, 2019 at 19:17
Your declarations are in the wrong scope. "text" and "delete" (terrible names, by the way) should be declared at the form level. Use text.Dispose(); and delete.Dispose(); to get rid of them. Simply calling this.Controls.Remove(...) is not enough since it would keep the controls in memory. — LarsTech
– LarsTech, Commented Jan 7, 2019 at 19:49

Reza Kargar · Accepted Answer · 2019-01-07 19:45:23Z

1

You can remove a control from a form like this:

private void generate_Click(object sender, EventArgs e)
{            
  RichTextBox text = new RichTextBox();
  Button delete = new Button();

  this.Controls.Add(text);
  this.Controls.Add(delete);
  i++;

  //---- Remove Part --------

  this.Controls.Remove(text);

  //------------------------
}

I hope this helps you.

answered Jan 7, 2019 at 19:45

Reza Kargar

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Comments

Yennefer · Accepted Answer · 2019-01-07 19:46:13Z

0

You can declare the field in your form

RichTextBox m_Control;

Then, assign it

private void generate_Click(object sender, EventArgs e)
{            
    RichTextBox text = new RichTextBox();
    Button delete = new Button();
    m_Control = text;

    this.Controls.Add(text);
    this.Controls.Add(delete);
    i++;
}

when you need to remove it, you can do

this. Controls. Remove(m_Control) ;

answered Jan 7, 2019 at 19:46

Yennefer

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1 Comment

Jimi Over a year ago

You really, really need to call Dispose() on the controls you added. + You're not removing the Button, here. Dispose of both, this will also remove them from the Parent container. You could also use a Lambda, something like: delete.Click += (o, evt) => { text.Dispose(); delete.Click -= (obj, ev) => { }; delete.Dispose(); };

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