c# - How to reload a form -

i have looking solution still found nothing
here code:

private void form1_load(object sender, eventargs e) {     richtextbox rtb = new richtextbox();     rtb.text = file.readalltext(@"c:\users\admin\desktop\myfile\customers.txt");     int = 0;     foreach (string line in rtb.lines)     {         if (line == "--")         {             listviewitem item = new listviewitem();             item.text = rtb.lines[i + 1];             item.subitems.add(rtb.lines[i + 2]);             item.subitems.add(rtb.lines[i + 3]);             item.subitems.add(rtb.lines[i + 4]);             listview1.items.add(item);         }          += 1;     } }  private void button1_click(object sender, eventargs e) {     form2 pop = new form2();     pop.showdialog();      string name = pop.name;     int age = int.parse(pop.age);     string dob = pop.dateofbirth;     string addr = pop.address;      streamwriter write = new streamwriter(@"c:\users\admin\desktop\myfile\customers.txt",true);      write.write("--\n");     write.write("{0}\n",name);     write.write("{0}\n",dob);     write.write("{0}\n",age);     write.write("{0}\n",addr);     write.close(); } 

the question how reload list view after write data text file?

extract logic out of form1_load

private void form1_load(object sender, eventargs e) {     refreshlistview(); }  private void button1_click(object sender, eventargs e) {     form2 pop = new form2();     pop.showdialog();      string name = pop.name;     int age = int.parse(pop.age);     string dob = pop.dateofbirth;     string addr = pop.address;                       streamwriter write = new streamwriter(@"c:\users\admin\desktop\myfile\customers.txt",true);                      write.write("--\n");                     write.write("{0}\n",name);                     write.write("{0}\n",dob);                     write.write("{0}\n",age);                     write.write("{0}\n",addr);                     write.close();       refreshlistview(); }  private void refreshlistview() {     listview1.items.clear();      richtextbox rtb = new richtextbox();     rtb.text = file.readalltext(@"c:\users\admin\desktop\myfile\customers.txt");     int = 0;     foreach (string line in rtb.lines)     {         if (line == "--")         {             listviewitem item = new listviewitem();             item.text = rtb.lines[i + 1];             item.subitems.add(rtb.lines[i + 2]);             item.subitems.add(rtb.lines[i + 3]);             item.subitems.add(rtb.lines[i + 4]);             listview1.items.add(item);         }          += 1;     } }