reference and cast error

[Vikram]

in my asp.net app, i get following two errors some times, these errors
occasionally occurs

please let me know if anyone has any idea why they occur

Cast from string "" to type 'Integer' is not valid

Object reference not set to an instance of an object

 

[Eliyahu Goldin]

What integer value do you think an empty string represents? Dotnet can't
decide it for you. You need to check the string on empty before casting it
to integer.

The object reference error means the variable you use is null. Check your
code, likely you need to create it.

Eliyahu

 

[Vikram]

No but same code works fine everytime, only some time it gives error and
user has to relogin ino the app. Is this due to session expiry or viewstate
curruption?