ASP.NET HTML Editor Control

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Web;
using System.Web.UI;
using System.IO;
using System.Web.UI.WebControls;
using SigmaToolBox.TextEditor;
using Microsoft.Security.Application;

namespace SigmaToolBox
{

    namespace TextEditor
    {
        [ToolboxData("<{0}:RichTextBox runat=server></{0}:RichTextBox>")]
        public class RichTextBox : WebControl
        {
            /// <summary>
            /// This function sets a value to the text editor like some text or html data from database or other resources for edition activities
            /// </summary>
            /// <param name="Value"></param>
            [Bindable(true)]
            [Category("Appearance")]
            [DefaultValue("")]
            [Localizable(true)]
            public void SetValue(string Value)
            {
                string script = "disableElement(document.getElementById('textToolsContainer'));;document.getElementById('textEditor').style.display='none';isOnSourceMode=true;isOndesignMode=false;document.getElementById('sourceTxt').style.display='block';document.getElementById('sourceTxt').value='" + Value + "'";
                Page.ClientScript.RegisterStartupScript(Page.GetType(), "valueSetterScript", script, true);
            }
            
            /// <summary>
            /// This property can be seted as True or false for get high level secured html code from editor
            /// </summary>
            public bool SetHighLevelSecurityForHtmlTags
            {
                set
                {
                    Security._SetHighLevelSecurityForHtmlTags = value;
                }
            }
            /// <summary>
            /// This function gets the data which has been provided in text editor for some purposes such as : demonstration in a specified page,storing in database,etc.
            /// </summary>
            /// <returns>string values</returns>
            public string GetValue()
            {
                return this.Page.Server.HtmlDecode(AntiXss.HtmlAttributeEncode(GetDecodedValue()));
            }

            /// <summary>
            /// Gets the Decoded value of a value which is encoded because of some security reasons
            /// </summary>
            /// <returns></returns>
            public string GetDecodedValue()
            {
                SourceActions Source = new SourceActions();
                Source.SourceProvider(this.Page);
                return this.Page.Server.HtmlDecode(Source._SourceCode);
            }
            protected override void OnLoad(EventArgs e)
            {
                base.OnLoad(e);
                Page.Form.Enctype = "multipart/form-data";
            }
            
            protected override void OnPreRender(EventArgs e)
            {
                base.OnInit(e);
                Registrar.RegisterScripts(new List<string> { "SigmaToolBox.js.loading.js", "SigmaToolBox.js.testJS.js", "SigmaToolBox.js.Encoder.js", "SigmaToolBox.js.slider.js" }, this.Page, this.GetType());
                string InitializerJS = Page.ClientScript.GetWebResourceUrl(this.GetType(), "SigmaToolBox.js.Initializer.js");
                this.Page.ClientScript.RegisterStartupScript(this.GetType(), "RichText", "<script language=\"javascript\" src='" + InitializerJS + "'></script>");
            }
            
            protected override void OnInit(EventArgs e)
            {
                base.OnInit(e);
                string Title = "<title>Kuleh.com</title>";
                string MetaTags = "<meta name=\"Description\" content=\"ایران گردی,گردشگری,کوله دات کام,kuleh.com,بهترین سایت گردشگری,نقشه راهنما,رستوران ها,هتل ها,نقشه راه ها,مسافرت,راهنمای سفر,دیدنی های ایران,سفر,راهنمای گردشگری,اطلاعات گردشگری\" /><meta http-equiv=\"Content-Type\" content=\"text/html\" /><meta name=\"google-site-verification\" content=\"_W5pX9ziDgLnVpTXszWQ2yWC7QiHeOGfA7CPtMAxqSg\" />";
                string Csslink = "<link rel='stylesheet' type='text/css' href='" + Page.ClientScript.GetWebResourceUrl(this.GetType(), "SigmaToolBox.EditorStyles.Style.css") + "' />";
                string RichTextStyle = "<link rel='stylesheet' type='text/css' href='" + Page.ClientScript.GetWebResourceUrl(this.GetType(), "SigmaToolBox.EditorStyles.textEditor.css") + "' />";
                string SliderStyle = "<link rel='stylesheet' type='text/css' href='" + Page.ClientScript.GetWebResourceUrl(this.GetType(), "SigmaToolBox.EditorStyles.slider.css") + "' />";
                this.Page.Header.InnerHtml = Title + MetaTags + Csslink + RichTextStyle + SliderStyle;
            }
            
            protected override void RenderContents(HtmlTextWriter output)
            {
                if (this.Page.IsPostBack)
                {
                    //if there is an uploaded file
                    HttpFileCollection UploadFile =this.Page.Request.Files;
                    for (int i = 0; i < UploadFile.Count; i++)
                    {
                        HttpPostedFile file =   UploadFile[i];
                        string FileName = Path.GetFileName(file.FileName);
                        string StrPath = this.Page.MapPath("~/Uploads/");
                        try
                        {
                            file.SaveAs(Path.Combine(StrPath, FileName));
                        }
                        catch (DirectoryNotFoundException DirectoryNullException)
                        {
                            output.Write(DirectoryNullException.Message);
                        }
                    }
                }
                Page.ClientScript.GetPostBackEventReference(this.Page, string.Empty);
                HtmlSourceInitializer.InitializeHtmlSource(this.Page);
                output.Write(HtmlSourceInitializer.RichTextHtmlSource.ToString());
            }
        }
    }
}