|
The object reference not set an instance of object tells me that it either cannot find the myusercontrolpage control on you page or the TextBox5 control on your objTestControl.
Debug and see where it happens.
Depending on how your control works you can expose the textbox text property as a property on you control that returns and set the textbox value. Just an idea...
|
|
|
|
|
You should create a public property on the usercontrol and set the textbox value from within the property.
|
|
|
|
|
create a public property on your user control and set the value from the page. 
cheers,
Abhijit
|
|
|
|
|
Hi,
I m working on an asp.net c# website. I have used session to maintain user login. Now the problem is when user clicks logout I have removed the session variables value and redirected user to a default page.
Now when the user clicks back button of the browser he is again inside that website which is supposed to be used after login.
Is there any solution for this ?
Regards
Vijay V.
Yash Softech
|
|
|
|
|
|
already tried.not working.
Vijay V.
Yash Softech
|
|
|
|
|
I m testing this in Mozilla firefox. In IE it works. session.remove() etc.
Regards
Vijay V.
Yash Softech
|
|
|
|
|
Sumit has given the correct solution. you have to use Session.Abondan(). it will remove all session and set them to null.
if this is your logout code
public void logout()<br />
{<br />
Session.Abondan();<br />
Response.Redirect("Login.aspx"); <br />
}
Now it will redirect to Login page. now if user click on Back Button of browser , it will again back to your last page, so you have to check the session on page load
check
if(Session["UserName"] == null )<br />
{<br />
response.redirect("Login.aspx");<br />
}<br />
else<br />
{<br />
}<br />
so this will again redirect to your login page even if user click on back button.
cheers,
Abhijit
|
|
|
|
|
I have done this.
I have checked session at page load for empty or null.
this has something to do with browser.
Mozilla maitains session in cache or something coz when I try to use any feature after pressing back button I m again out.
Any suggestion?
Regards
Vijay V.
Yash Softech
|
|
|
|
|
Abhijit Jana wrote: so this will again redirect to your login page even if user click on back button.
NO. When you press back button, no request is made by the browser for the page.It just loads from the cache. So page_load code won't get execute.
|
|
|
|
|
Remove the browser cache.
i think it'll work
Cheers!!
Brij
|
|
|
|
|
It will work but I dont think its a good practice.
Regards
Vijay V.
Yash Softech
|
|
|
|
|
Brij, I think it will not be a parmanent soluation . Any idea to resolve ?
cheers,
Abhijit
|
|
|
|
|
Trying to find out.
Regards
Vijay V.
Yash Softech
|
|
|
|
|
you can use
window.history.forward(1);
to disallow the back button to be clicked ... whenever session expires..
Just after redirect, place this script to the login.aspx.
Abhishek Sur
|
|
|
|
|
Will it be solve the actual purpose , (remove cache from browser ) ?
cheers,
Abhijit
|
|
|
|
|
This isnt the best solution.
The problem is that you shouldnt be trying to disable areas of the browser because no matter what, if a user wants to and knows how they will be able to use every feature of the browser they wish to.
You should be building a better web app so it doesnt matter if the user hits the back button in the browser.
Deliver yesterday, code today, think tomorrow.
"http://www.heuse.com/cphumor.htm"
|
|
|
|
|
Can this be managed using cookies? Coz the sites like gmail uses cookies to handle login and once you logout they wont allow you to login again.
Am I thinking right?
Any suggestion?
Regards
Vijay V.
Yash Softech
|
|
|
|
|
There is no permanent solution available.
|
|
|
|
|
VijayVishwakarma wrote: Is there any solution for this ?
No reliable solutions are available.
When you press back button, browser loads the previous page from it's cache. It won't request for that page again.
Some JS can forward the page when back button is pressed, but again it is not reliable as JS can be turned off. If you are very much concerned about users viewing the page, I suggest to use popup window for displaying all your secure pages. Once user logs out, close that popup. Also ensure that your webpages are not accessible when user has turned off JS.
|
|
|
|
|
Check this article out:
BackButton
Deliver yesterday, code today, think tomorrow.
"http://www.heuse.com/cphumor.htm"
|
|
|
|
|
There are many alternatives to it not the exact solution
1. When User clicks log out button close the browser after resetting the session.
2. After logged out also when user clicks back browser button then you could see the last page visited when user was logged in
But this page comes from Cache no server side request has sent
So no worry if you are checking user credentials in every page
he won't be able to do any thing
I think just remove Cache ok even if he refresh the Page then he should redirect to default log in Page
Hope i am able to explain it
Thanks and Regards
Sandeep
If If you look at what you do not have in life, you don't have anything,
If you look at what you have in life, you have everything... "
Check My Blog
|
|
|
|
|
Put this in your Page Load event :
Response.Expires = 0;
Response.ExpiresAbsolute = DateTime.Now;
|
|
|
|
|
Apologies to bother you but can you please brief me where? On which page?
Regards
Vijay V.
Yash Softech
|
|
|
|
|
You can place it on all the pages you are using in the Page Load event. (probably could to this in the HttpModule)
protected void Page_Load(object sender, EventArgs e)
{
Response.Expires = 0;
Response.ExpiresAbsolute = DateTime.Now;
if (Session["User"] != null)
{
//some other code...
}
else
{
//Redirect to Login Page
}
}
The on the Logout button if the Sessions are "Abandoned" and the user tries navigating Back to this page he will be re-directed (asked for login credentials)...
Hope this helps
|
|
|
|
General 
News 
Suggestion 
Question 
Bug 
Answer 
Joke 
Praise 
Rant 
Admin 
Submit an article or tip
