Setting assembly version automatically when building in a Bamboo server

Scenario :
How to instruct your msbuild script to set the correct “AssemblyVersion” of your libraries using “AssemblyInfo.cs”  when building in a Bamboo server.In Puzzlepart it is vital to have the current build number and the current revision number in the assembly version of products.
Solution :
Assembly version syntax : <major version>.<minor version>.<build number>.<revision>
More info can be found here about the syntax. 
Step 1 : First you need to make sure the corresponding Build-Specific Variable are passed into the build script.

How ?

In Bamboo build configuration under the “Builder” tab you have “Options” where you can pass msbuild command line switches.
example : /p:BuildKey=${bamboo.buildKey} /p:BuildPlanName=${bamboo.buildPlanName} /p:BuildNumber=${bamboo.buildNumber} /p:Revision=${bamboo.custom.svn.revision.number}

Step 2 : Accessing those variables from the msbuild script

<PropertyGroup>
    <MajorVersion Condition="'$(MajorVersion)' == ''">1</MajorVersion>
    <MinorVersion Condition="'$(MinorVersion)' == ''">0</MinorVersion>
    <BuildNumber Condition="'$(BuildNumber)' == ''">0</BuildNumber>
    <Revision Condition="'$(Revision)' == ''">0</Revision>
    <BuildPlanName Condition="'$(BuildPlanName)' == ''">LocalBuild</BuildPlanName>
    <BuildKey Condition="'$(BuildKey)' == ''">NOKEY</BuildKey>

  </PropertyGroup>

Step 3 : Create the Assembly version using those properties

<PropertyGroup>
       <ComputedAssemblyName>$(MajorVersion).$(MinorVersion).$(BuildNumber).$(Revision)</ComputedAssemblyName>
</PropertyGroup>

Step 4 : Use the assembly version in “AssemblyInfo” task

<AssemblyInfo CodeLanguage="CS"
      OutputFile="$(ApplicationName)\Properties\AssemblyInfo.cs"
      AssemblyTitle="ApplicationName"
      AssemblyDescription="Description"
      AssemblyCompany=""
      AssemblyProduct="$(ApplicationName)"
      AssemblyCopyright="Copyright © "
      ComVisible="false"
      CLSCompliant="false"
      Guid="248D49F7-BC5D-4413-8E4A-98B4654B1594"
      AssemblyVersion="$(ComputedAssemblyName)" />