Generating the designer file for an asp.net application

Here I want to generate the designer file like default.aspx.designer.cs file for the page default.aspx. i had been seen it in may application but i don't know how it be happened so ple开发者_如何学Goase tell me some solution .

The .designer.cs files are automatically generated by visual studio itself. When you open a webpage is design mode, visual studio writes the .designer.cs file to match what you have put on the page.

These files are hidden in the Solution Explorer by default, unless the web project is set to "Show all files", which may be why you have not noticed them until now.