Execute a XCopy operation after all the projects build in MSBuild - msbuild

Question

I have a .proj file which is configured to execute a solution file which in turn build all the projects in the solution.
I want to add an XCopy operation which should copy the .dll files of all projects to another location only after all the projects build is completed.
I have tried with below, but it is not copying the dlls.
I am newbie in writing MSBuild tags, so it could be that I may be wrong in choosing this approach to write the task in this way.
Please provide a solution, if anyone knows.
<?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="Current" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
<PropertyGroup>
<Configuration Condition="'$(Configuration)' == 'Release|Debug'"/>
<Platform Condition="'$(Platform)' == ''">x64</Platform>
</PropertyGroup>
<ItemDefinitionGroup>
<SolutionToBuild>
<Properties>Configuration=$(Configuration);Platform=$(Platform)</Properties>
<Targets>Clean;Build</Targets>
</SolutionToBuild>
</ItemDefinitionGroup>
<ItemGroup>
<SolutionToBuild Include="..\Seg\Algorithms.sln" />
</ItemGroup>
<Target Name="Build" >
<MSBuild Projects="#(SolutionToBuild)" Targets="%(SolutionToBuild.Targets)" Properties="%(SolutionToBuild.Properties)" BuildInParallel="false" ContinueOnError="false" />
</Target>
<Target Name="Clean">
<MSBuild Projects="#(SolutionToBuild)" Targets="Clean" Properties="%(SolutionToBuild.Properties)" BuildInParallel="false" ContinueOnError="false" />
</Target>
<PropertyGroup>
<CopyDestination>..\Extern\Algo\bin\$(Configuration)\</CopyDestination>
<CopySource>..\Seg\Algorithms\$(Configuration)\DoBin\</CopySource>
</PropertyGroup>
<ItemGroup>
<FilesToCopy Include="$(CopySource)*.dll"/>
</ItemGroup>
<ItemGroup>
<CustomBuildStep Include ="#(FilesToCopy)">
<Message>Copying..</Message>
<Command> XCOPY %(Identity) $(CopyDestination) /f /y </Command>
</CustomBuildStep>
</ItemGroup>
<PropertyGroup>
<CustomBuildAfterTargets>Build</CustomBuildAfterTargets>
</PropertyGroup>
</Project>

Answer 1

Think of Targets as methods that are called. They run in sequence, so you just need to put your copy after the solution build:
<Target Name="Build">
<MSBuild Projects="#(SolutionToBuild)" Targets="%(SolutionToBuild.Targets)" Properties="%(SolutionToBuild.Properties)" BuildInParallel="false" ContinueOnError="false" />
<ItemGroup>
<FilesToCopy Include="..\Seg\Algorithms\$(Configuration)\DoBin\*.dll" />
</ItemGroup>
<Copy SourceFiles="#(FilesToCopy)" DestinationFolder="..\Extern\Algo\bin\$(Configuration)\" SkipUnchangedFiles="true" />
</Target>