Question

I have got two buttons, which both submit a form in asp.net.

I need to know in the function below..What button was clicked..The login or register button. And by that information, I want to trigger the one of the functions in the load event.

    protected void Page_Load(object sender, EventArgs e)
{
    AddCountries();
    AddAge();

      if (IsPostBack)
      {
          string pwd = LoginPassword.Text;
          string saltAsBase64 = "z3llWdYSA2DY3M4uNSpOQw==";
          string hash = HashPass.GenerateHash(pwd, saltAsBase64);

          if (Page.IsValid)
          {
              LoginUser(hash);
         /// Depending on what the user pressed..I need to trigger the function 
        // above or below
              RegisterUser(hash);
          }



      }
}

What if I have this in the button event:

FormsAuthentication.RedirectFromLoginPage(currentUser.UserName, false);

will the redirection happen immediately after the button event? or will it trigger the page load event again, ignoring that redirection?

Answer 1

If the buttons are server side controls <asp:button/> then you can handle the event of the (specific) button:

protected void Button1_Click(object sender, EventArgs e) {....}

vs.

protected void Button2_Click(object sender, EventArgs e) {......}

Which are raised after Page_Load see: ASP.Net Page Life Cycle

If you are using standard HTML <input type=submit /> and posting back to the same page, then you can inspect the Request.Form collection (which you can also do with server side controls).

UPDATE:

• Page_Load is always raised on postback
• client-side validation will prevent a postback
• if you are using server validation controls, check Page.IsValid in the handler before executing something
• Depending on your needs, you can also inspect controls/values in Page_Load (checking for Page.IsPostBack – the point is you have options…

So if you (instead) wanted to inspect on Page_Load:

protected void Page_Load(object sender, EventArgs e)
{
    if (Page.IsPostBack)
    {
        if ((UserEmail.Text == "[e-mail]") &&
         (UserPass.Text == "37Yj*99Ps"))
          {
            FormsAuthentication.RedirectFromLoginPage
               (UserEmail.Text, Persist.Checked);
          }
        else
          {
            ......
          }
    }
}

above code taken, and slightly modified, from MSDN

UPDATE2:

If you are using server validation controls, don’t use Page_Load. Use the button handler and check for Page.IsValid.