Deleting control in runtime

Assuming you have the label in the picturebox:

pictureBox1.Controls.Remove(lbl);


if not, whatever container you have it in you will need to access the Controls collection and remove it.

This is exactly what i have done. I want only one label box displaying at a given time.If user click insert text again then previous lable should be delted and another one should be added.

public void insert_text_Click(object sender, System.EventArgs e)
            {                  
                        Label lbl = new Label();                  
                        lbl.Size=new Size(130,40);                        
                        lbl.Text = textBox2.Text;
                        lbl.BackColor = Color.White;
                        lbl.Location = new Point(336, 150);                  
                        lbl.MouseDown += new MouseEventHandler(lbl_MouseDown);
                        lbl.MouseMove += new MouseEventHandler(lbl_MouseMove);
                  if(pictureBoxEx1.Controls.Contains(lbl))
                  {pictureBoxEx1.Controls.Remove(lbl);
                  }
                        pictureBoxEx1.Controls.Add(lbl);                        
                        insert_text.Enabled=false;                  

            }

Any help is appreciated.