How to upload a file from the client machine to the server asp.net C#

Hello everyone. I need to upload a file from the client to the server, I wrote the code in c# and everything is working when I run the application from localhost, my code is uploading correctly each file, but when I try to access typing the IP for example 123.12.12.12:4444 nothing happens, there's no file uploaded. I can see the page perfectly, but I dont know if I need to configure something on the IIS or something like that. please could somebody show me the way? thank you very much for any help!


The code:
                    string strFileName = FileUploadControl.PostedFile.FileName;                     try                 & ...