add_library is not working in cmake for adding csh

I am trying to build the csharp dll from the set of .cs files. I used add_library() function to add the source files(.cs files).But it is giving warning like "add_library for library libname without any source files".Please provide a solution to make it to work.

Thanks in advance.

CMakeLists.txt is:

cmake_minimum_required(VERSION 2.8)

project(MyAddIn)

AUX_SOURCE_DIRECTORY(${CMAKE_CURRENT_SOURCE_DIR}/MyAdd-In/ MyAddIn_SOURCES)     


SET_SOURCE_FILES_PROPERTIES(${MyAddIn_SOURCES} PROPERTIES LANGUAGE CSharp)

ADD_LIBRARY(AddInTrg SHARED ${MyAddIn_SOURCES})

SET_TARGET_PROPERTIES(AddInTrg PROPERTIES 
                               LINKER_LANGUAGE CSharp
                               RUNTIME_OUTPUT_DIRECTORY bin
                               RUNTIME_OUTPUT_DIRECTORY_DEBUG bin
                               RUNTIME_OUTPUT_NAME MyAddIn_Bin
                               ARCHIVE_OUTPUT_DIRECTORY lib
                               ARCHIVE_OUTPUT_DIRECTORY_DEBUG lib
                               OUTPUT_NAME MyAddIn_Bin)

add_custom_command(OUTPUT ${CMAKE_BINARY_DIR}/bin/MyAddIn_Bin.dll
                   WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/MyAdd-In
                   COMMAND C:/WINDOWS/Microsoft.NET/Framework/v3.5/csc.exe
                   ARGS 
                   -target:library                 
                   -out ${CMAKE_CURRENT_BINARY_DIR}/bin/MyAddIn_Bin.dll
                   "${CMAKE_CURRENT_SOURCE_DIR}/MyAdd-In/Ribbon.cs" "${CMAKE_CURRENT_SOURCE_DIR}/MyAdd-In/ThisAddIn.cs" "${CMAKE_CURRENT_SOURCE_DIR}/MyAdd-In/Ribbon.xml"
                   COMMENT "-- Generating AddIn Dll")

CMake currently has no language support for C#.

In particular, the add_library command will not work with .cs source files. You could attempt to handle all of the compilation manually using custom targets, but be aware that this is extremely difficult to pull off and the gains are limited.

Also, take a look at CMake's ExternelProject_Add. This might be the right choice if all you want is to build an external .csproj using MSBuild from within a bigger CMake environment.