c# - Login form using collection list methods -

here when press login

and here when press yes

am doing atm project using c# , required teacher complete task out using database created class contains list store data in while creating new account, problem cant use data login (i don't know how bool coding thing determines if item in list)

note:in login should enter name , pin code login

here create account form code

public partial class newaccountform : form {     public newaccountform()     {         initializecomponent();     }     accounts account1;       private void btncreate_click(object sender, eventargs e)     {     }      private void button1_click(object sender, eventargs e)     {      }      private void button2_click(object sender, eventargs e)     {         form1 login = new form1();         this.hide();         login.show();     }      private void btncreate_click(object sender, eventargs e)     {           int interest = 0;         char type = '0';         double amount = 0 ;         double balance = 0;          switch (cbotype.selectedindex)         {             case 0: type = '1'; break;              case 1: type = '2'; break;          }         saveing account1 = new saveing(interest, txtname.text, txtcontact.text,             txtpincode.text, type, amount,balance);          data.csaveing.add(account1); //slist shows because static if remove static not appears     }      private void newaccountform_load(object sender, eventargs e)     {      } } 

and login form

public partial class form1 : form {     public form1()     {         initializecomponent();     }     data accounts;     bool validcode = false;      private void form1_load(object sender, eventargs e)     {      }      private void label1_click(object sender, eventargs e)     {      }      private void textbox1_textchanged(object sender, eventargs e)     {      }      private void button1_click(object sender, eventargs e)     {          accounts.name = txtname.text;         accounts.code = txtcode.text;          if (string.isnullorwhitespace(txtname.text))         {             messagebox.show("please type full name");         }         if (string.isnullorwhitespace(txtcode.text))         {             messagebox.show("please enter correct account pin code");         }         else if ((accounts.name == txtname.text)) ;         else if ((accounts.code != txtcode.text)) ;         {             int i;             progressbar1.maximum = 100;             progressbar1.minimum = 0;             progressbar1.step = 1;             timer1.start();              (i = 0; <= 50; i++)                  progressbar1.value = i;          }     }      private void button2_click(object sender, eventargs e)     {         newaccountform naf = new newaccountform();         this.hide();         naf.show();     }      private void timer1_tick(object sender, eventargs e)     {         progressbar1.performstep();         if (progressbar1.value == 99)         {             loginform login = new loginform();             this.hide();             login.show();         }     }      private void label3_click(object sender, eventargs e)     {      }      private void label4_click(object sender, eventargs e)     {      } } 

this question missing lot of necessary information. isn't clear @ required do.

however, said, if need store data not allowed use database, put text file. encrypt data make more "secure".

if need hold data per user session, doesn't matter when first run application class containing users empty. in fact makes things easier because first time run application know user class empty.

i suggest have login form containing list<userclass> userslist. when user clicks login, first check whether list contains entries:

if(userslist.any()) { ... } 

if there no values in list show form create new user. when you've validated values in create user form add new instance of userclass list, , show logged in form, whatever may be.

i suggest read 1 of many introductory tutorials on .net , c# because isn't right place ask such basic questions :)