How to restrict the default values initialization while creating object of the class

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C#

In my application while creating derived class object baseclass constructor called and dervied class constructor also called at the time varibles are intalized and then operations are performed on the method.finally return the response.in that response i had get varibles are get with values based on operation performed and default values initialization don't want return the default value initialization. i need varibles are initialized with values based operation performed.

[HttpPost]
[Route("api/Account/Login")]
 public async Task<GetBaseCustomerResponse> Login([FromBody]LoginRequest request)
  {
  GetBaseCustomerResponse _response = new GetBaseCustomerResponse();


   -----operations are performed--------



   return _response 
}

public class GetBaseCustomerResponse : GetResponseTemplate<BaseCustomerModel>
{
      
}

public class BaseCustomerModel
{
public int Customerid{get;set;}

public string cusname{get;set;}

public string cusaddress{get;set;}

public string email{get;set;}

public string Dateofbirth{get;set;}

}

please help me.
Thank u

What I have tried:

In my application while creating derived class object baseclass constructor called and dervied class constructor also called at the time varibles are intalized and then operations are performed on the method.finally return the response.in that response i had get varibles are get with values based on operation performed and default values initialization don't want return the default value initialization. i need varibles are initialized with values based operation performed