Question

I want to save an image after some changes in image.
but I am getting an error while calling .Save() function.

            var tempapth = Server.MapPath("..//Images//Temp//" + btnfile.FileName);
            btnfile.SaveAs(tempapth);
            using (var fileStream = File.OpenRead(tempapth))
            {
                var ms = new MemoryStream();
                fileStream.CopyTo(ms);
                ms.Seek(0, SeekOrigin.Begin);
                System.Drawing.Image img1 = System.Drawing.Image.FromStream(ms);
                fileStream.Close();
                var bmp1 = img1.GetThumbnailImage(100, 150, null, IntPtr.Zero);
                bmp1.Save(path);
            }

bmp1.save(path);

give an error

A generic error occurred in GDI+

Answer 1

EDIT
The OP changed the question after I wrote this reply. Previously, there was also a path variable declared, which contained a path name (but no file name).

In the first version of your code, you had a path name without a file name (Server.MapPath("..//Images//Category//" + catid + "//");). To save, you need to add a file name, too, like:

string path = Server.MapPath("..//Images//Category//" + catid + "//Image.bmp");