How to count the number of Button clicks?

[pbala]

if I declared

 protected void Button1_Click(object sender, EventArgs e)
        {
 count++;

[pbala]

How to count the number of Button clicks?

if I declared

 protected void Button1_Click(object sender, EventArgs e)
{
int count=0;
count++;
int noofcount=count;
}

it will results only 1. For Every click the count is changed to 0....

[PRR]

Declare your count variable outside the Button1_Click event handler... As of now the count variable is declared and initialized on click event..

[balame2004]

Better to declare count variable to be static inside the event method..

protected void Button1_Click(object sender, EventArgs e) 
{ 
static int count=0; 
count++; 
int noofcount=count; 
}

[PRR]

Better to declare count variable to be static inside the event method..

protected void Button1_Click(o bject sender, EventArgs e)
{
static int count=0;
count++;
int noofcount=count ;
}

Static variable are used in context of class ... They cant be used inside functions...
You need to declare static variables in form class or default Program class.. They are initialized before execution of the static constructor or other constructor ...

[Frinavale]

Here is an example of what DeepBlue is talking about:

C#:

static int count = 0; 
// the count variable's scope is for the class (the page)
// it can be used through out the class's (page's) code
// it is shared between all instances of this class
// static variables must be declared outside of any functions
// since they have a class scope
// they are shared between all instances of the class

protected void Button1_Click(object sender, EventArgs e)
{
//if the variable had been declared here it would have a scope 
//for the Button1 Click function only.
  count++;
}

VB:

Shared count As Integer

' the count variable's scope is for the class (the page)
' it can be used through out the class's (page's) code 
' it is shared between all instances of this class.
' shared variables must be declared outside of any functions
' since they have a class scope
' they are shared between all instances of the class

Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
'if the variable had been declared here it would have a scope 
'for the Button1 Click function only.
  count+=1
End Sub

Another thing to keep in mind is the ASP.NET page life cycle:

• A request for the page is made
• Your page is compiled
• Your Controls and Objects are loaded
• The page Load event is executed
• Any control events are are executed
• The page is rendered and sent to the browser
• All Objects are destroyed

This means that if you don't declare your variable as Static/Shared,your count variable is going to be destroyed when the Page Object is destroyed. You have to store this value somewhere so that you can persist (remember) the count value between page requests.

You can use Session, ViewState, Cookies, or HiddenFields to do this.

-Frinny

[balame2004]

Or you can declare the variable as static. Now the value of the variable won't change during page round trips.

static int count = 0;  
  
protected void Button1_Click(object sender, EventArgs e) 
{ 
//if the variable had been declared here it would have a scope  
//for the Button1 Click function only. 
  count++; 
  int noofcount=count; 
}

[Bassem]

Or you can declare the variable as static. Now the value of the variable won't change during page round trips.

What do you mean with this part?
I didn't understand the difference!

Thanks,
Bassem

[Frinavale]

What do you mean with this part?
I didn't understand the difference!

Thanks,
Bassem

When you declare a variable as Static (C#) or Shared (VB.NET) this variable is used by all instances of the class.

In this case, since the Page is a class, the variable will be shared between all instances of that page.

What does this mean?

Well, a user comes to the page, an instance of your asp Page class is created (by ASP.NET). When the user clicks the button the static/shared variable is updated by that instance of your aspx Page Class.

Now the same user, clicks the button again...an instance of your aspx Page class is created and the same static/shared variable is updated.

Even if another user comes to the page...ASP.NET creates an instance of your aspx Page class which uses the same static/shared variable.

Make sense now?

[Bassem]

Yes, thanks a lot Frinny. It was a good idea to be used.

Many thanks,
Bassem

[dnanetwork]

user static variable or viewstate...

[tangerine]

thanks frinny for this!!! cleared my concept

[ZeeshanAli]

Why do you want a Server Click? If its required so you may use View States or Session State however Static variable can not be use in a public method.
Instead of Server Click you can use Client Click in you web page.

For example.

var count = 0;

function inc_num(){
count++;
// do something
}

<button type="button" onclick="inc_num()" value="Increment" />