UseCase : It is indepth detailed description about Customer 
Requirments. it is developed from BRS/SRS. it is prepared 
by business analyst or QA Lead.

Testcase: It is a doument describing the input,action and 
expected response to determine wether the application is 
working correctly according to the customer requirments.
it is derived from srs,usecases and test scenarios. while 
developing test cases we can find gaps in the requirments 
also.

Hi

Use case is a set of scenario's of User requirement.


Test Case is a document Designed based on the Use case
To Evaluate between Expected & Actual Result.


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use case is the document which is prepared by studying brs 
in which the user requirements are given in detailed form.
it is easy fr testers to write test cases by studying use 
cases.


test case is the document which contains input/actions or 
events & their expected results.this documents purpose is 
to evaluate the expected with actual.

use case is a technique to capture the functional 
requirements of the system.

test case is a description for what to test, what data to 
be given and expected outputs.

use case is a pictorial representation of proceedings

test case is a set of procedures to find a defect

Use case consits of User actions and system response

it includes field validations positive and negative scenario

Use case contains only only validation not the test data 
but the test case contains test data remaining same

USE cases is a pictorial representation of requirments.

Test Case is a document Designed based on the Use case
To Evaluate between Expected & Actual Result.

Use case is the way we use the application .. 
For example , for ATM application  the way we use the ATM 
machine is the use case ...

Test case is the procedure to validate whether the 
application is working properly or not .
For example we can give worng inputs and sometimes try with 
wrong usecase to findout if the ATM application is workign 
fine or not .. A test case may be written by using a use 
case also sometimes .

use case:how to use the functionality
Test casre:how to test the functionality

Use case is what BA prepares where the functinality for a 
particular module is explained in detailed.

Test case is prepared by a Tester which will have positive 
and negative scenario. Each and every function will have 
test case and explains the particular function intend to do.