Question

Alright so I have a task, that I have to let the client try to enter the password 3 times, if he doesn’t enter the right password in 3 times, it will redirect him to another page, The thing is that I don’t know how can I use the session, how can I do like ++ or something.

Session["counter"] = 0;

And I am trying to do the following:

Session["counter"]++;

How can I detect if the client tried to enter the password 3 times?
Thanks

Answer 1

int counter=1;
Session["counter"]=counter;

When you want to update that, read the value and convert it to int and then increase, save back

if(Session["counter"]!=null)
{
 counter=Convert.ToInt32(Session["counter"]);
}
counter++;
Session["counter"]=counter;

EDIT : As per the comment, This is how you can check the counter value. I wrapped the checking inside 2 methods to set and get, you can even use Properties as others mentioned.

private int GetLoginAttempts()
{
    int counter=0;
    if(Session["counter"]!=null)
    {
     counter=Convert.ToInt32(Session["counter"]);
    }
  return counter;
}
private void IncreaseLoginAttempts()
{
   if(Session["counter"]!=null)
   {
     counter=Convert.ToInt32(Session["counter"]);
   }
   counter++;
   Session["counter"]=counter;
}

and when user tries to login( in your button click / action method ), check the Current value

   if(GetLoginAttempts()==3)
   {
        //This means user already tried 3 times, show him a message !
   }
   else
   {
        //Do the login process, If login fails, increase the counter 
       IncreaseLoginAttempts()
   }