using System;

​

public class Program

{

    public class Campaign

    {

        public string Name { get;set; }

    }

    public class CampaignProxy

    {

        public string Name { get;set; }

    }

    public static object SetEntityFieldsFixed(object entity, object from, params string[] properties)

    {

        if (properties == null)

            return entity;

​

        var entityType = entity.GetType();

        var fromType = from.GetType();

​

        foreach (string field in properties)

        {

            var entityProp = entityType.GetProperty(field);

            var fromProp = fromType.GetProperty(field);

​

            if (entityProp == null)

                throw new ArgumentException(field + " field is not found on entity", "field");

​

            entityProp.SetValue(entity, fromProp.GetValue(from, null), null);

        }

​

        return entity;

    }

    public static object SetEntityFieldsBug(object entity, object from, params string[] properties)

    {

        if (properties == null)

            return entity;

​

        var type = entity.GetType();

        foreach (string field in properties)

        {

            if (type.GetProperty(field) == null)

                throw new ArgumentException(field + " field is not found on entity", "field");

​

            var pInfo = type.GetProperty(field);

            if (pInfo == null)

                continue;

​

            var prop = type.GetProperty(field);

            if (prop != null)

                prop.SetValue(entity, prop.GetValue(from, null), null);

        }

​

        return entity;

    }

    public static void Main()

    {

        var dbModel = new CampaignProxy { Name = "Hakan" };

        var toBeUpdateModel = new Campaign { Name = "Cafer" };

        SetEntityFieldsBug(dbModel, toBeUpdateModel, "Name");

        //SetEntityFieldsFixed(dbModel, toBeUpdateModel, "Name");

        Console.WriteLine(dbModel.Name);

    }

}