How to add target attribute for all links in html document using C#, Dotnet ,HtmlAgilityPack

Adding target attribute for all links in html document using C#, Dotnet ,HtmlAgilityPack

#region "Description"

/*

    Description: There are ways that I am going to explain in this tutorial of adding target element for links in HTML document

    1)  Using Normal String Replacement

    2)  Using HTMLAgilityPack       

*/

#endregion       

//1)  Using Normal String Replacement

        /// <summary>

        /// add Target Elements to links

        /// </summary>

        /// <param name="doc">html string without target element</param>

        /// <returns>>html string with target element</returns>

        static string AddTargetElementsForLinksUsingReplacement(string HtmlString)

        {

            try

            {

                HtmlString = HtmlString.Replace("<a ", "<a target='_blank' ");  

            }

            catch (Exception ex)

            {

            }

            return HtmlString;

        }

//2)  Using HTMLAgilityPack    

        /// <summary>

        /// add Target Elements to links

        /// </summary>

        /// <param name="htmDoc">HTMLAgiltiyPack Object of html doc without target element</param>

        /// <returns>>HTMLAgiltiyPack Object of html doc with target element</returns>

        static HtmlDocument AddTargetElementsForLinks(HtmlDocument htmDoc)

{

    string strPreviousOuterHtml = string.Empty;         

    try

    {

        HtmlNodeCollection nc = htmDoc.DocumentNode.SelectNodes("//a");

        if (nc != null)

        {

            foreach (HtmlNode node in nc)

            {

                strPreviousOuterHtml = node.OuterHtml;

                if (node.Attributes["target"] != null)

                    node.Attributes["target"].Value = "_blank";

                else

                    node.Attributes.Add("target", "_blank");

                htmDoc.DocumentNode.InnerHtml = htmDoc.DocumentNode.InnerHtml.Replace(strPreviousOuterHtml, node.OuterHtml);                      

            }

        }

    }

    catch (Exception ex)

    {

    }

    return htmDoc;

}

        /// <summary>

        /// Adds Target Elemetns to links

        /// </summary>

        /// <param name="doc">html string without target element</param>

        /// <returns>>html string with target element</returns>

        static string AddTargetElementsForLinks(string HtmlString)

         {

             string strPreviousOuterHtml = string.Empty;

             HtmlDocument htmDoc = new HtmlDocument();

             try

             {               

                 htmDoc.LoadHtml(HtmlString);

                 HtmlNodeCollection nc = htmDoc.DocumentNode.SelectNodes("//a");

                 if (nc != null)

                 {

                     foreach (HtmlNode node in nc)

                     {

                         strPreviousOuterHtml = node.OuterHtml;

                         if (node.Attributes["target"] != null)

                             node.Attributes["target"].Value = "_blank";

                         else

                             node.Attributes.Add("target", "_blank");

                         htmDoc.DocumentNode.InnerHtml = htmDoc.DocumentNode.InnerHtml.Replace(strPreviousOuterHtml, node.OuterHtml);

                     }

                 }

             }

             catch (Exception ex)

             {

             }

             return  htmDoc.DocumentNode.OuterHtml;

         }