How can i convert html code from database to Excel in C#

Try with below code:

string xslData = "'0' cellspacing='0' border='0' class='Messages' id='idTbl' runat='server'>dateSubjectclass='myHot_smsMessages_new'>01/01/2014Some Subject No 1class='myHot_smsMessages_new'>10/12/2013Some subject no 2";
HttpContext.Current.Response.Clear();
HttpContext.Current.Response.Charset = "";
HttpContext.Current.Response.ContentType = "application/msexcel";
HttpContext.Current.Response.AddHeader("Content-Disposition", "filename=ExcelFile.xls");
HttpContext.Current.Response.Write(xslData);
HttpContext.Current.Response.End();
HttpContext.Current.Response.Flush();