innerhtml

Then you can try the below code:

  string strYourHTML = "Your html part goes here";
  string strHTMLHeadPart = string.Concat(@"",
  "" ,"",
  "");
  string strHTML = string.Concat(strHTMLHeadPart, strYourHTML, " ");

Assume that your HTML string contains only contains body tags. If not, provide your final html string then it will be easy to provide solution.

            string strYourHTML = "Your html part goes here ";
            string strHTMLHeadPart = string.Concat(@"",
                            "" ,
                            "",
                            "");
            string strHTML = string.Concat(strHTMLHeadPart, strYourHTML, "");