using SQLDMO;
   using System.Collections.Generic;

   public static List<string> GetSQLServersList2()
   {
       List<string> result = new List<string>();
       ApplicationClass sqlApp = new ApplicationClass();
       NameList lst = sqlApp.ListAvailableSQLServers();
       for (int i = 1; i <= lst.Count; i++)
           result.Add(lst.Item(i));
       lst = null;
       sqlApp = null;

       return result;

   }

using System.Collections.Generic;
using System.Data;
using System.Data.Sql;

public class CListServers
{
   public static List<string> GetSQLServersList()
   {
       List<string> result = new List<string>();

       // Retrieve the enumerator instance and then the data.
       var instance = SqlDataSourceEnumerator.Instance;
       var table = instance.GetDataSources();

       // Display the contents of the table.
       foreach (DataRow row in table.Rows)
       {
           result.Add(string.Format("{0}\\{1}", row[0], row[1]));
       }

       return result;
   }
}

using System.Collections.Generic;
using System.Data;
using Microsoft.SqlServer.Management.Smo;

public class CListServers
{
   public static List<string> GetSQLServersListSMO()
   {
       List<string> result = new List<string>();
       DataTable dt = SmoApplication.EnumAvailableSqlServers(false);
       if (dt.Rows.Count > 0)
       {
           foreach (DataRow dr in dt.Rows)
           {
               result.Add(dr["Name"].ToString());
           }
       }
       return result;
   }
}

<Project>
  <ItemGroup>
    <GlobalPackageReference Include="Nerdbank.GitVersioning" Version="3.5.109" />
  </ItemGroup>
</Project>

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>netcoreapp2.1</TargetFramework>
    <Features>strict</Features>
  </PropertyGroup>
</Project>

<Project Sdk="Microsoft.NET.Sdk.Web">
  <PropertyGroup>
    <TargetFramework>netcoreapp2.1</TargetFramework>
  </PropertyGroup>
  <ItemGroup>
    <PackageReference Include="Microsoft.AspNetCore.App" Version="2.1.4" />
    <PackageReference Include="Serilog.AspNetCore" Version="2.1.1" />
    <PackageReference Include="Serilog.Sinks.RollingFile" Version="3.3.0" />

public class Program
{
    public static int Main(string[] args)
    {
        Log.Logger = new LoggerConfiguration()
       .MinimumLevel.Debug()
       .MinimumLevel.Override("Microsoft", LogEventLevel.Information)
       .Enrich.FromLogContext()
       .WriteTo.RollingFile("logs/log-{Date}.txt")
       .CreateLogger();
 
        try
        {
            Log.Information("Starting web host");
            BuildWebHost(args).Run();
            return 0;
        }
        catch (Exception ex)
        {
            Log.Fatal(ex, "Host terminated unexpectedly");
            return 1;
        }
        finally
        {
            Log.CloseAndFlush();
        }
 
    }
 
    public static IWebHost BuildWebHost(string[] args) =>
          WebHost.CreateDefaultBuilder(args)
          .UseStartup<Startup>()
              .UseSerilog() // <-- Add this line
              .Build();
 
}