C＃Web应用程序项目文件更新主机提供程序服务器上的问题

Hi I have created Web Form Application project and uploaded to hosting server provided by some hosting provider company. Every things code, Database connectivity are working fine. But I am facing strange issue when ever I do any changes in the codebehind files and upload files to server new functionality not works. Even sometimes I delete the code files old code still run on the webpage. I have written several emails to support team but they are not able to solve the issue( Not even able to understand the concer).Hi I have created Web Form Application project