You could use a beanshell pre-processor to generate on the fly and inject it 
into the HTTP request. Beanshell can pretty much execute arbitrary jave code, 
so: 

http://stackoverflow.com/questions/41107/how-to-generate-a-random-alpha-numeric-string-in-java
 
http://guruscode.wordpress.com/2009/02/11/random_alphanumeric_value_generator/ 

Regards, 
Noel 

----- "sudheer reddy" <[email protected]> wrote: 
> Hi All 
> 
> In my application i have to pass alpha numeric values to a variable in 
> a http request ( randomly) 
> 
> Can anyone assist me in how to create alpha numeric values in jmeter 
> 
> Rgds 
> 
> Sudheer 
> 

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