How to create an image on the fly and display it on the webpage without saving it on server

Respected

I am developing a module in asp.net. Where a user submits a picture using fileupload control to the server. At server i Have to create image of the uploaded file without saving it on server and show it on the webpage in response.

Stream fi = FileUpload1.PostedFile.InputStream;
var ext = FileUpload1.PostedFile.ContentType;
var imageOrNot = ext.Contains("image") ? true : false;
 
if (imageOrNot)
{
      byte[] imagearr = new byte[fi.Length];
      fi.Read(imagearr, 0, (int)fi.Length);
      fi.Close();
      Response.Write(imagearr);
      MemoryStream ms = new System.IO.MemoryStream(imagearr);
      System.Drawing.Image imgTemp = System.Drawing.Image.FromStream(ms);

To Some Extent I have coded some of the portion but the major portion is to be done