gistfile1.cs

using System;
using Microsoft.SqlServer.Management.Smo;

namespace LogTruncate
{
    class Program
    {
        static void Main(string[] args)
        {
            Server server = new Server(@"dbserver\instancename");
            foreach (Database db in server.Databases)
            {
                try
                {
                    if (!db.IsSystemObject)
                    {
                        Console.WriteLine(db.Name);
                        db.RecoveryModel = RecoveryModel.Simple;
                        db.Alter();
                        foreach (LogFile logfile in db.LogFiles)
                        {
                            logfile.Shrink(1, ShrinkMethod.Default);
                        }
                    }
                }
                catch (Exception e)
                {
                    Console.WriteLine(e.Message);
                }
            }
        }
    }
}