Question

I have the below code

protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
           //do something 
        }
        else
        {
            // do something else
        }
    }

    protected void Button1_Click(object sender, EventArgs e)
    {
        //do something       
    }
}

The point is that a post back happens if I press F5/refresh button or a button click. How will I prevent the code from doing any action if F5/refresh button is clicked?

I have checked Detect F5 being pressed and Refresh but the solution of mine will be different as I need to do this in C# code.

Thanks

Answer 1

You are trying to capture something on the client – so it must be client side script (as discussed in the link).

It’s not a postback in ASP.Net terms – your page is simply being requested again (GET). You cannot stop this – its just like going to some other page on your web site and clicking back through some navigation.

If you are saying you want to prevent some type of server side code you have from being run (more than x times) then you can think about sessions or cookies and read them in before you run whatever process. A simplistic sample:

• visit page 1 – set session or cookie that identifies page 1 process was run
• visit page 2 – set session or cookie that identifies page 2 process was run
• return to page 1 – check for existence of session or cookie variable, and if exists, don’t run page 1 process.

Another option, if viable is to use ASP.Net caching.