a upper/lower sensitive problem on RFC call

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hello, everyone.

Maybe it is not the proper forum to discuss this topic, but I think the ABAP programinig Forum is the best forum in SDN, which has the most vistors.

So please help me solve this problem, if possible.

I meet a problem on RFC call through dotnet connector.

There is a RFC deploy on the R3 server.

And a portal application using dotnet connector to call the RFC from web side.

The problem is when input some string like 'AbCdEf' from web side, transfer to the sap side, the RFC always get the string like 'ABCDEF'.

I think it dues to the auto upper convert by the RFC call, and if in SE37, we can check the upper/lower box to solve it.

But how can I solve it in this portal case?

Can I get original string in the RFC side?

How we can get the string as the original content 'AbCdEf' in RFC side?

any suggestion is welcome,

and I'm waitting for your answer, thanks a lot