c# - Visual Studio 2010 and dotnet framework v2.0 unable to compile -

i using visual studio 2010 open dotnet framework 2.0 web application. conversion looks ok, target platform has been set v2.0

however, during rebuilding of solution complains references(dll) have added requires later version of dotnet framework.

all dll build using dotnet framework 2.0 many years back, impossible require later version

i clueless in resolving this.

a) message when rebuild solution. type or namespace name xxx not exist in namespace xxx (are missing assembly or reference?)

b) message when try re-add dll reference xxx.dll or 1 of dependencies, requires later version of .net framework 1 specified in project.

you can change .net framework target clicking properties on project menu , selecting new target in .net framework dropdown box.