Edit Csproj Progamatically

EditCsProj.cs

using System.Collections.Generic;
using System.Linq;
using Microsoft.Build.Evaluation;

class Program
{
    static void Main(string[] args)
    {
        var projectList = new List<string>()
        {
            // Your Project file paths
        };
        foreach (var project in projectList)
        {
            var projectCollection = new ProjectCollection();
            var proj = projectCollection.LoadProject(project);
            // Select Debug configuration
            var debugPropertyGroup =
            proj.Xml.PropertyGroups.First(
            e => e.Condition == " '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ");
            debugPropertyGroup.SetProperty("TreatWarningsAsErrors", "true");
            debugPropertyGroup.SetProperty("RunCodeAnalysis", "true");
            // Select Release configuration
            var releasePropertyGroup =
            proj.Xml.PropertyGroups.First(
            e => e.Condition == " '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ");
            releasePropertyGroup.SetProperty("TreatWarningsAsErrors", "true");
            releasePropertyGroup.SetProperty("RunCodeAnalysis", "true");
            //Sign assembly with a with strong name key
            proj.SetProperty("SignAssembly", "true");
            proj.SetProperty("AssemblyOriginatorKeyFile", "test.pfx");
            //Save
            proj.Save();
        }
    }
}