I am creating image in folder docs and showing that image in dynamically created img tag but images are not displayed why ?

string fileID = Guid.NewGuid().ToString();
Byte[] imgBytes = p.ImgContent;
string filePath = Server.MapPath("~/Docs/" + fileID + p.ImgName);
FileStream fs = File.Create(filePath);
fs.Write(imgBytes, 0, imgBytes.Length);
fs.Flush();
fs.Close();

liContent.Text += "<a class='flipLightBox' href='" + filePath + "'>" + "<img class ='content' src=\"" + filePath + "\" />" + "&nbsp;" + "<span><b>" + p.Title + "</b>" + "<br>" + p.Description + "</span>" + "</a>";