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vamshi Capvamshi Cap 

Reproduce the error+

In our organization I am working as a developer, I got a new requiement that there was an application which is already running but while developing there might be earlier developer missed out to handle the exceptions, now I stated working on this though I can catch the exceptions and provide user friendly messaged to the User but before deploy, our test team should test this for that I need to provide the proper test criteria or document to test my implimentation. Can you please help me how can I re-produce the same exception with the error message I got in the Past.

The error is: System.Null Exception
When they enter null value on screen, are they not getting the message that you added after putting null check in code? 
vamshi Capvamshi Cap
thanks Sunitbpositive for your replwy,

till now I did not put the code, I can see our earlier developer checking null exception but still I am not sure where this error is occurring.