gistfile1.txt

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.CSharp;
using Microsoft.CodeAnalysis.CSharp.Syntax;

namespace RoslynDemo
{
    class Program
    {
        static void Main(string[] args)
        {
            string sourceText = @"
using System;
using System.Collections.Generic;
using System.Text;

namespace HelloWorld { 
    class Program 
    { 
        static void Main(string[] args) 
        { 
            int x = 5
        }
    }
}
";           
            var tree = CSharpSyntaxTree.ParseText(sourceText);
            var root = (CompilationUnitSyntax)tree.GetRoot();

            // https://github.com/dotnet/roslyn/issues/932
            var compilation = CSharpCompilation.Create("helloWorld")                
                .AddReferences(MetadataReference.CreateFromAssembly(typeof (object).Assembly))
                .AddSyntaxTrees(tree);

            var diagnostic = compilation.GetDiagnostics();
            foreach (var d in diagnostic)
            {
                Console.WriteLine(d.Descriptor.Id + ":" + d.Descriptor.Category + " - " + d.GetMessage() + " [" + d.Severity + "]");
                Console.WriteLine("\t" + d.Location);         
            }


            var model = compilation.GetSemanticModel(tree);                   

        }
    }
}