在COPY 檔案後,遇到這個問題,記錄一下.
狀況
VS2003 專案的tree亂掉 : A檔案與B檔案連在一起
建置會過,程式功能也都正常

檢查
用記事本打開 Project.csproj
查看有問題的檔案

               <File
                    RelPath = "A.aspx"
                    SubType = "Form"
                    BuildAction = "Content"
                />
                <File
                    RelPath = "A.aspx.cs"
                    DependentUpon = "B.aspx"
                    SubType = "ASPXCodeBehind"
                    BuildAction = "Compile"
                />
               <File
                    RelPath = "B.aspx"
                    SubType = "Form"
                    BuildAction = "Content"
                />
                <File
                    RelPath = "B.aspx.cs"
                    DependentUpon = "B.aspx"
                    SubType = "ASPXCodeBehind"
                    BuildAction = "Compile"
                />

處理方法
把DependentUpon 改成跟RelPath一樣就可以了

               <File
                    RelPath = "A.aspx"
                    SubType = "Form"
                    BuildAction = "Content"
                />
                <File
                    RelPath = "A.aspx.cs"
                    DependentUpon = "A.aspx"
                    SubType = "ASPXCodeBehind"
                    BuildAction = "Compile"
                />

備註
如果有用VSS,只想CHECK OUT專案檔的話,不想全部的專案都CHECK OUT下來的話.
可以先用"Microsoft Visual SourceSafe" ,將專案檔CHECK OUT下來,用記事本改完再CHECK IN回去.
"C:\Program Files (x86)\Microsoft Visual Studio\VSS\win32\SSEXP.EXE"