c# - the type or namespace name 'linq' could not be found in 'system' -

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i'm trying understand process of bulding c# project using microsoft build engine (also known msbuild) , face problem. problem simple, think don`t understand something.

i wrote simple program consist 2 .cs files. first file "mathop.cs". in file define 2 functions: add(double num1, double num2) , multiply(doble, double); second file "program.cs." here define 2 variable passed add function placed in mathop file , getting rezult; programm correct.

then wrote simple msbuild file define tasks , targets building. , when launch in visual studio command prompt getting erorr cs0234: type or namespace name linq not found in system namespace. interesting referenced system.dll , etc. in msbuild file. , if comment using directives in program.cs file error disappear.

<project defaulttargets="compile" xmlns="http://schemas.microsoft.com/developer/msbuild/2003" > <propertygroup>     <assemblyinfo>build</assemblyinfo>     <builtdir>build\</builtdir> </propertygroup>  <itemgroup>     <csfile include="msbuildtest\program.cs"/>     <csfile include="msbuildtest\properties\assemblyinfo.cs"/>     <csfile include="msbuildtest\mathop.cs"/>      <reference include="system.dll"/>     <reference include="system.data.dll"/>     <reference include="system.drawing.dll"/>     <reference include="system.windows.forms.dll"/>     <reference include="system.xml.dll"/> </itemgroup>  <target name="prebuild">     <exec command="if not exist $(builtdir) md $(builtdir)"/> </target>  <target name="compile" dependsontargets="prebuild">     <csc sources="@(csfile)"         references="@(reference)"         outputassembly="$(builtdir)$(msbuildprojectname).exe"         targettype="exe"/> </target>  <target name="clean" >     <exec command="del $(builtdir)$(assemblyinfo).exe"/> </target> <target name="rebuild" dependsontargets="clean;compile"/>

in current state msbuild use csc .net 2.0, know nothing linq.

the easiest way fix issue specify 4.0 version in msbuild project forcing msbuild use correct csc version:

<project toolsversion="4.0"     defaulttargets="compile"     xmlns="http://schemas.microsoft.com/developer/msbuild/2003" >

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