C#

stw1.WriteLine("UdpServer at port 10000 has started at:", start1.ToString());

if (cb.Checked)
            {
                n1 = lb4.Text;
                // System.Diagnostics.Process.Start(n1);
                si1 = new ProcessStartInfo(n1);
                proc = Process.Start(si1);
                proclist.Add(proc);

                DateTime start1 = proc.StartTime;
                if (!File.Exists("startlog1.txt"))
                {
                    stw1 = new StreamWriter("startlog1.txt");
                }
                else
                {
                    File.AppendText("startlog1.txt");
                }
                stw1.WriteLine("UdpServer at port 10000 has started at:", start1.ToString());
                stw1.WriteLine("=======================================================================");
                stw1.Flush();
            }

            if (cb1.Checked)
            {
                n2 = lb5.Text;
                //System.Diagnostics.Process.Start(n2);
                ProcessStartInfo si2 = new ProcessStartInfo(n2);
                proc = Process.Start(si2);
                proclist.Add(proc);

                DateTime start2 = proc.StartTime;
                if (!File.Exists("startlog2.txt"))
                {
                    stw2 = new StreamWriter("startlog2.txt");
                }
                else
                {
                    File.AppendText("startlog2.txt");
                }
               
                stw2.WriteLine("UdpServer at port 10001 has started at:", start2.ToString());
                stw2.WriteLine("=======================================================================");
                stw2.Flush();

            }

// Determine the active child form.
          Form activeChild = this.ActiveMdiChild;

          // If there is an active child form, find the active control, which
          // in this example should be a RichTextBox.
          if (activeChild != null)
          {
              try
              {
                  RichTextBox theBox = (RichTextBox)activeChild.ActiveControl;
                  if (theBox != null)
                  {
                      // Put the selected text on the Clipboard.
                      Clipboard.SetDataObject(theBox.SelectedText);

                  }
              }
              catch
              {
                  MessageBox.Show("You need to select a RichTextBox.");
              }

System.IO.StreamReader StreamReader1 = fi.OpenText();             //reads the currently selected text file
String text = StreamReader1.ReadToEnd();
TextEditorForm editForm = new TextEditorForm();                   // creates a new instance of the mdi child form editform
TabPage childTab = new TabPage();                           //create new tab page
editForm.MdiParent = this;                                        //set as child of this form
editForm.Name = "Child" + createdTab.ToString();                  //sets the name of editform to child + 1
editForm.Text = lblFile.Text;                                     //sets the tabpage text to the file name lblfile.text is the file that is currently in the listbox
childTab.Name = editForm.Name;                                    //make sure name and text are same for easier control
childTab.Text = editForm.Text;                                    //this is for syncrhonize later
TextEditortabControl.TabPages.Add(childTab);                      //add new tab
editForm.richTxtBox.Parent = childTab;                            //attach to tab
editForm.richTxtBox.Name = editForm.Name;                         // naming the rtb the same as the rest for easier control
editForm.richTxtBox.ContextMenu = new ContextMenu();              // does not add the contextmenu
ToolStripMenuItem newtexteditMenuTab = new ToolStripMenuItem();   //create menu to hold tab
newtexteditMenuTab.Text = editForm.Text;                          //make sure the name and text are same to synchonize later
newtexteditMenuTab.Name = editForm.Name;                          // still the same name
newtexteditMenuTab.Click += new EventHandler(newMenuTab_Click);   //add event handler
TextEditortabControl.SelectTab(childTab);                         //this is to make sure that tab page is selected in the same time
editForm.EditText = text;                                         //populates the rtb with the selected text file text
editForm.Show();                                                  //as new form created so that corresponding tab and child form is active
createdTab++;                                                     //increment of course
StreamReader1.Close();

public TextEditorForm()
            {  
                this.richTxtBox = new RichTextBox();                
                this.richTxtBox.Dock = DockStyle.Fill;                
                this.richTxtBox.Multiline = true;                
                this.richTxtBox.ScrollBars = RichTextBoxScrollBars.Vertical;
                this.richTxtBox.WordWrap = true;
                this.richTxtBox.DetectUrls = true;
                this.richTxtBox.Visible = true;
                //this.ContextMenu = new ContextMenu(); this didnt work either
               

                
                // Add the RichTextBox to the Form
                this.Controls.Add(this.richTxtBox);

            }