GridView multiple rows select helper

CheckMarkSelection\CheckMarkSelection.sln
..................\CheckMarkSelection.suo
..................\CheckMarkSelection
..................\..................\bin
..................\..................\...\Debug
..................\..................\...\.....\CheckMarkSelection.exe
..................\..................\...\.....\CheckMarkSelection.pdb
..................\..................\...\.....\CheckMarkSelection.vshost.exe
..................\..................\...\.....\CheckMarkSelection.vshost.exe.manifest
..................\..................\CheckMarkSelection.csproj
..................\..................\Form1.cs
..................\..................\Form1.Designer.cs
..................\..................\Form1.resx
..................\..................\GridCheckMarksSelection.cs
..................\..................\obj
..................\..................\...\x86
..................\..................\...\...\Debug
..................\..................\...\...\.....\CheckMarkSelection.csproj.FileListAbsolute.txt
..................\..................\...\...\.....\CheckMarkSelection.csproj.GenerateResource.Cache
..................\..................\...\...\.....\CheckMarkSelection.exe
..................\..................\...\...\.....\checkmarkselection.exe.licenses
..................\..................\...\...\.....\CheckMarkSelection.Form1.resources
..................\..................\...\...\.....\CheckMarkSelection.pdb
..................\..................\...\...\.....\CheckMarkSelection.Properties.Resources.resources
..................\..................\...\...\.....\DesignTimeResolveAssemblyReferences.cache
..................\..................\...\...\.....\DesignTimeResolveAssemblyReferencesInput.cache
..................\..................\...\...\.....\TempPE
..................\..................\Program.cs
..................\..................\Properties
..................\..................\..........\AssemblyInfo.cs
..................\..................\..........\licenses.licx
..................\..................\..........\Resources.Designer.cs
..................\..................\..........\Resources.resx
..................\..................\..........\Settings.Designer.cs
..................\..................\..........\Settings.settings

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