Captcha/CaptchaGenerator.cs

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/*
 * Author: Kishore Reddy
 * Url: http://commonlibrarynet.codeplex.com/
 * Title: CommonLibrary.NET
 * Copyright: � 2009 Kishore Reddy
 * License: LGPL License
 * LicenseUrl: http://commonlibrarynet.codeplex.com/license
 * Description: A C# based .NET 3.5 Open-Source collection of reusable components.
 * Usage: Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
using System;
using System.Collections.Generic;
using System.Text;
using System.Security.Cryptography;
using System.Drawing;
using System.Drawing.Text;
using System.Drawing.Imaging;
using System.Drawing.Drawing2D;
using System.Web;

using ComLib;
using ComLib.Cryptography;


namespace ComLib.CaptchaSupport
{
    /// <summary>
    /// This class implements a Captcha generator 
    /// for web usage.
    /// </summary>
    public class CaptchaWeb : CaptchaGenerator, ICaptcha
    {
        private string _hiddenFieldName;
        private string _userInputFieldName;
        private string _urlParam;


        /// <summary>
        /// Initialize.
        /// </summary>
        public CaptchaWeb()
            : this("CaptchaGeneratedText", "CaptchaUserInput", "CaptchaText")
        {
        }


        /// <summary>
        /// Initialize.
        /// </summary>
        /// <param name="hiddenFieldName"></param>
        /// <param name="userInputTextFieldName"></param>
        /// <param name="urlParam"></param>
        public CaptchaWeb(string hiddenFieldName, string userInputTextFieldName, string urlParam)
        {
            _hiddenFieldName = hiddenFieldName;