public void DeleteCategory(string categoryName)
{
currentCategories = serializer.DeserializeCategory();
/*##########Borde brytas ut i en egen metod############### */
currentCategories.RemoveAll(x => x.Name == categoryName);
serializer.DeleteAllCategories();
/*##########Borde brytas ut i en egen metod############### */
foreach (Category category in currentCategories)
{
serializer.SerializeCategory(category);
}
}