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• gRPC (Google Remote Procedure Calls) is a modern open-source high-performance Remote Procedure Call (RPC) framework that can run in any environment.
• It can efficiently connect services in and across data centers with pluggable support for load balancing, tracing, health checking, and authentication.
• It is also applicable in the last mile of distributed computing to connect devices, mobile applications, and browsers to backend services.

• Open Visual Studio 2022 and create a new gRPC project, and name it to GrpcCoreService and select .NET 8.0 under the Framework option.
  

• Review the project structure.
  

• Right-click on greet.proto and click on Properties and verify that gRPC Stub Classes is set to Server only.

• Add a Console App Project with the name GrpcClientApp and select the required configuration.

• Add the required packages to the client app project.

   Install-Package Grpc.Net.Client
   Install-Package Google.Protobuf
   Install-Package Grpc.Tools
  

• Create a Protos folder and copy the Protos\greet.proto file from the GrpcCoreService under this folder.

• Update the namespace inside the greet.proto file to the project's namespace:

   option csharp_namespace = "GrpcClientApp";
  

• After that right click on greet.proto and click on Properties and set the gRPC Stub Classes to Client only.

• Finally, edit the GrpcClientApp.csproj project file:

   <ItemGroup>
     <Protobuf Include="Protos\greet.proto" GrpcServices="Client" />
   </ItemGroup>
  

• Once this is completed update the Program.cs file to call the greeter service.

   var message = new HelloRequest
   {
       Name = "Sandeep Kumar"
   };
   var channel = GrpcChannel.ForAddress("http://localhost:5181/");
   var client = new Greeter.GreeterClient(channel);
   var serverResponse = await client.SayHelloAsync(message);
  
   Console.WriteLine(serverResponse.Message);
   Console.WriteLine("Press any key to exit...");
   Console.ReadKey();
  

• Set Up StartUp Project: Configure both projects as startup projects in the proper order.

• Run the project and review the output of both the gRPC service and the client in the Console window.

• Add employee.proto file under the Protos folder.

• Under the Services folder add the EmployeeService.cs.

• Inject this new service under the Program.cs.

   app.MapGrpcService<EmployeeService>();
  

• Once service setup is completed setup the client app by implementing the employee.proto and then update the Program.cs.

   var channel = GrpcChannel.ForAddress("http://localhost:5181/");
   var client = new Employee.EmployeeClient(channel);
  
   Console.WriteLine("Enter Employee ID....");
   var inputStr = Console.ReadLine();
  
   int empId = 0;
   if (!int.TryParse(inputStr, out empId))
   {
       Console.WriteLine("This is invalid Employee ID, please exit and try again....");
   }
   else
   {
       var emp = new GetEmpDetail { EmpId = empId };
  
       var serverResponse = await client.GetEmpInformationAsync(emp);
       Console.WriteLine("Employee Name | Role | Email ID | Department");
       Console.WriteLine($"{serverResponse.EmpName} | {serverResponse.EmpRole} | {serverResponse.EmpEmail} | {serverResponse.EmpDepartment}");
   }
   Console.WriteLine("Press any key to exit...");
   Console.ReadKey();
  

• Review the project structure after adding all the required files.
  

• Run the project and review the output in the Console window.