if not equal condition in c#

i have a condition where the value should not be null or it should be either R or U.
i had tried with below method but still i am not able to succeed with the result.

if (Place == "" || Place != "R" || Place != "U")
   {
    response.Status = "FAILURE";
    response.Message = "Place Criteria is required / Invalid (place should be either R(rural)/U(urban)";
   }

eventhough i pass R or U it shows the error message . please help me with the solution.

Thanks

Answers:

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Method 1

I suggest else if constructon; here we have 2 valid options (rural and urban) and all the others are incorrect ones:

 if (Place == "R")
   RuralRoutine(); //TODO: put the right code here
 else if (Place == "U")
   UrbanRoutine(); //TODO: put the right code here
 else { // All the other options are invalid
   response.Status = "FAILURE";
   response.Message = 
     "Place Criteria is required / Invalid (place should be either R(rural)/U(urban)";
 }

Please, note, that if you want to add, say, "I" for an “Industrial Area”, all you’ll have to do is to add one more else if:

 ...
 else if (Place == "I")
   IndustrialAreaRoutine();
 else {  
   response.Status = "FAILURE";
   ...

Method 2

if(Place ==""||( Place!="R" && Place !="U"))
{

}

you want the Place not be null and be “R” or “U” so you should use && to make sure the 3(null,”R”,”U”) do not happen at the same time.

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