c# - How do i save and load with streamwriter and streamreader -

i have 3 forms, main form month calendar , panel shows appointment, , 2 others,form2 , form3 opening button main form. want have save button in form2 , form3 , when pressed, save information enter in textboxes , selected combobox , when application close , open again, information should load , show in panel.(with streamwriter , streamreader)

i tried xml method can't find out hope method me!

here xml solution

using system;  using system.collections.generic;  using system.componentmodel;  using system.data;  using system.drawing;  using system.linq;  using system.text;  using system.windows.forms;  using system.xml;  using system.xml.serialization;  using system.io;    namespace windowsformsapplication6  {      public partial class form1 : form      {          const string filename = @"c:\temp\test.txt";            list<textbox> boxes = null;          list<combobox> cboxes = null;          public form1()          {              initializecomponent();                this.formclosing +=  new formclosingeventhandler(form1_formclosing);              boxes = new list<textbox>() { textbox1, textbox2, textbox3 };              cboxes = new list<combobox>() { combobox1, combobox2, combobox3 };                xmlserializer xs = new xmlserializer(typeof(root));              xmltextreader reader = new xmltextreader(filename);              root newroot = (root)xs.deserialize(reader);                foreach (textbox tbox in boxes)              {                  string name = tbox.name;                  box box = newroot.boxes.where(x => x.name == name).firstordefault();                  tbox.text = box.rows[0];              }              foreach (combobox  cbox in cboxes)              {                  string name = cbox.name;                  box box = newroot.boxes.where(x => x.name == name).firstordefault();                  foreach (string row in box.rows)                  {                      cbox.items.add(row);                  }              }          }            private void form1_formclosing(object sender, formclosingeventargs e)          {              root root = new root();              root.boxes = new list<box>();              foreach(textbox tbox in boxes)              {                  box newbox = new box() { name = tbox.name, type = "text",                       rows = new list<string>(){tbox.text}                  };              }              foreach (combobox  cbox in cboxes)              {                  box newbox = new box()                  {                      name = cbox.name,                      type = "combo",                      rows = getrows(cbox)                  };              }              xmlserializer serializer = new xmlserializer(typeof(root));                streamwriter writer = new streamwriter(filename);              xmlserializernamespaces _ns = new xmlserializernamespaces();              _ns.add("", "");              serializer.serialize(writer, root, _ns);              writer.flush();              writer.close();              writer.dispose();          }          private list<string> getrows(combobox cbox)          {              list<string> rows = new list<string>();              foreach (string row in cbox.items)              {                  rows.add(row);              }              return rows;          }      }      [xmlroot("root")]      public class root      {            [xmlelement("boxes")]          public list<box> boxes { get; set; }        }      [xmlroot("box")]      public class box      {          public string name { get; set; }          public string type { get; set; }          [xmlelement("rows")]          public list<string> rows { get; set; }      }    }