MSBUILD: Adding 1 to a variable?
I have a text file with a numeric value in it (say 1).
I open and read the file using:

            <BuildVersionFile Include="$(MSBuildProjectDirectory)\BuildNumber.txt"/>
    <Target Name="ReadReleaseNotes">
        <ReadLinesFromFile
            File="@(BuildVersionFile)" >
          <Output
              TaskParameter="Lines"
              ItemName="Build

Version"/>
    </ReadLinesFromFile>

I want to increase the value of BuildVersion and write it back to the txt file. How can I do this math?
MSBUILD: Adding 1 to a variable?
===

I have a text file with a numeric value in it (say 1).
I open and read the file using:

            <BuildVersionFile Include="$(MSBuildProjectDirectory)\BuildNumber.txt"/>
    <Target Name="ReadReleaseNotes">
        <ReadLinesFromFile
            File="@(BuildVersionFile)" >
          <Output
              TaskParameter="Lines"
              ItemName="Build

Version"/>
    </ReadLinesFromFile>

I want to increase the value of BuildVersion and write it back to the txt file. How can I do this math?