sitecore get image url

code behind

/// <summary>
/// get image url from sitecore imagefield
/// </summary>
/// <param name="field">imagefield</param>
/// <returns>image url</returns>
public static string GetImageURL(ImageField field)
{
    string imageURL = string.Empty;
    if (field != null && field.MediaItem != null)
    {
        Sitecore.Data.Items.MediaItem image = new Sitecore.Data.Items.MediaItem(field.MediaItem);
        imageURL = Sitecore.Resources.Media.MediaManager.GetMediaUrl(image);
    }
    return imageURL;
}