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// Create product category if it doesn't exist
Dynamicweb.eCommerce.Products.Categories.Category productCategory = Dynamicweb.eCommerce.Products.Categories.Category.GetCategoryByID( App.CodeSettings.ProductCategoriesCategoryID_SimpleProduct );
if ( productCategory == null || productCategory.Name.Length == 0 )
{
  productCategory = Dynamicweb.eCommerce.Products.Categories.Category.Create( App.CodeSettings.ProductCategoriesCategoryID_SimpleProduct, "Products" );
  productCategory.Save();
}    

FieldOptionCollection options = new FieldOptionCollection();

foreach ( AnveldelseTXT item in list )
{
  if ( item.SprogKode.ToLower() == App.CodeSettings.DefaultLanguage )
  {
    FieldOption opt = new FieldOption();
    opt.Name = item.AnvendelseNavn;
    opt.Value = item.AnvendelseKode;
    opt.IsDefault = false;
    opt.Sort = i;
    options.Add( opt );
    i++;
  }
}

/* Find field in category */
bool foundFilter = false;
foreach ( Dynamicweb.eCommerce.Products.Categories.Field f in productCategory.Fields )
{
  if ( f.ID.Equals( "MyFieldID" ) )
  {
    f.FieldOptions.Clear();
    foreach ( FieldOption item in options )
    {
      f.FieldOptions.Add( item );
    }
    foundFilter = true;
    break;
  }
}

// If we didn't find field, create it
if ( !foundFilter )
{
  // Create Field for colors
  FieldType type = new FieldType( 15 );
  productCategory.AddField( App.CodeSettings.ProductCategoriesFieldID_Use, "Anvendelse", App.CodeSettings.ProductCategoriesFieldID_Use, type.ID.ToString(), string.Empty, FieldListPresentationType.CheckBoxList, options );
}

productCategory.Save();