linq to xml There are multiple root elements.

var temp2 = temp1.Element("staticContent");
            if (temp2 != null)
            {
                string str = "<remove fileExtension=".svg" />rn               <mimeMap fileExtension=".svg" mimeType="image/svg+xml" />rn               <remove fileExtension=".nupkg" />rn               <mimeMap fileExtension=".nupkg" mimeType="application/zip,application/octet-stream" />rn               <remove fileExtension=".webm" />rn               <mimeMap fileExtension=".webm" mimeType="video/webm" />rn               <remove fileExtension=".mp4" />rn               <mimeMap fileExtension=".mp4" mimeType="video/mp4" />";
                temp2.AddFirst(XElement.Parse(str));
            }