ex-action-try-catch.cs

[ResponseType(typeof(void))]
public async Task<IHttpActionResult> PutContact(int id, EntityContact entityContact)
{
    if (!ModelState.IsValid)
    {
        return BadRequest(ModelState);
    }

    if (id != entityContact.Id)
    {
        return BadRequest();
    }

    _db.Entry(entityContact).State = EntityState.Modified;

    try
    {
        await _db.SaveChangesAsync();
    }
    catch (DbUpdateConcurrencyException)
    {
        if (!ContactExists(id))
        {
            return NotFound();
        }

        throw;
    }

    return StatusCode(HttpStatusCode.NoContent);
}

Generics.cs

protected static T GetFromEntityModel<T>(Entity entityModel) where T : EntityBaseViewModel, new()
{
    var derivedTypes = GetDerivedClasses<T>().ToList();

    var typeToConvert = (from type in derivedTypes
                         let properties = type.GetProperties().Where(prop => Attribute.IsDefined(prop, typeof(SpecificInfoPerCountryAttribute)))
                         where properties != null
                         where entityModel.SpecificInfoPerCountry.Count > 0 && 
                               entityModel.SpecificInfoPerCountry.All(attr => properties.Any(prop => prop.Name == attr.Description))
                         select type).SingleOrDefault() ?? typeof(T);

    var specificViewModel = (T)Activator.CreateInstance(typeToConvert);
    
    ...
}