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Solved
Session expired but doesnt redirect, throws an error
Posted on 2013-01-06
I have the code below to redirect when the session is expired. Instead of redirecting after the session is expired, it throws this error
Object reference not set to an instance of an object.
Why is that? why isn't it redirecting? how can I fix it?
Object reference not set to an instance of an object.
Why is that? why isn't it redirecting? how can I fix it?
private int BusinessNameId
{
get
{
if (string.IsNullOrEmpty(Session["BusinessId"].ToString()))
{
Response.Redirect("~/SessionExpired.aspx");
}
return int.Parse(Session["BusinessId"].ToString());
}
}
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9 Comments
You need to check for null
if(Session["BusinessId"] == null)
{
Response.Redirect("~/SessionExpired.aspx");
return null;
}
else
return int.Parse(Session["BusinessId"].ToString());
But i have it in a IsNullOrEmpty..
Now, If I change it to below..in that case it goes to redirect line. No object null error. Why is it like that...is it because string businessId = Session["BusinessId"].ToSt
initializes it to an empty string?
private int BusinessNameId
{
get
{
string businessId = Session["BusinessId"].ToSt
if (string.IsNullOrEmpty(businessId))
{
Response.Redirect("~/Sessi
}
return int.Parse(Session["Busines
}
}
Now, If I change it to below..in that case it goes to redirect line. No object null error. Why is it like that...is it because string businessId = Session["BusinessId"].ToSt
initializes it to an empty string?
private int BusinessNameId
{
get
{
string businessId = Session["BusinessId"].ToSt
if (string.IsNullOrEmpty(businessId))
{
Response.Redirect("~/Sessi
}
return int.Parse(Session["Busines
}
}
Active today
Hi Farzadw,
No. Problem is this statement:
Session["BusinessId"].ToSt
What happens if your session is expired, Session["BusinessId"] will return a null.
Now your code is always executed from most inner to most outer brackets, so it will first try to execute your .ToString() method on a null object and that will throw an exception even before your string.IsNullOrEmpty get's a chance to execute itself.
Also another trick you can use for such scenarios is to use as operator
string businessId = Session["BusinessId"] as string;
Regards,
Chinmay.
No. Problem is this statement:
Session["BusinessId"].ToSt
What happens if your session is expired, Session["BusinessId"] will return a null.
Now your code is always executed from most inner to most outer brackets, so it will first try to execute your .ToString() method on a null object and that will throw an exception even before your string.IsNullOrEmpty get's a chance to execute itself.
Also another trick you can use for such scenarios is to use as operator
string businessId = Session["BusinessId"] as string;
Regards,
Chinmay.
Active today
Even this should work:
private int BusinessNameId
{
get
{
string businessId = Session["BusinessId"] as string;
if (string.IsNullOrEmpty(businessId))
{
Response.Redirect("~/SessionExpired.aspx");
}
return int.Parse(Session["BusinessId"].ToString());
}
}
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