In Visual Studio I keep getting two copies of FormMain.cs and one contains old edits, why? -

In Visual Studio 2008, I keep two copies of my FormMain.cs file, it has old edits, I created it again Is the project and solution but it does not fix, what is the problem?

Thanks

Check the file attributes (right-click and properties in Window Explorer Select)

Ensure that you are not setting a read-only flag