Configuration :: Bitmap Image Saving When Running The Application On Iis Server

I m facing one problem which is related to Bitmap Image Actually My image is saved properly without iis server but when i run application on iis server then its give Exception "A generic error occurred in GDI+."
I m using this code-

Byte[] bytes = (Byte[])ds.Tables[0].Rows[r][1];
MemoryStream memStream = new MemoryStream();
memStream.Write(bytes, 0, bytes.Length);
System.Drawing.Bitmap origBMP = new System.Drawing.Bitmap(memStream);
System.Drawing.Bitmap newBMP = new System.Drawing.Bitmap(origBMP, 100, 150);
System.Drawing.Graphics objGra = System.Drawing.Graphics.FromImage(newBMP);
objGra.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
objGra.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
origBMP.Dispose();
newBMP.Save(Server.MapPath("ImageUpload\" + r + ".Jpeg"), System.Drawing.Imaging.ImageFormat.Jpeg); //exception throw "A generic error occurred in GDI+."
newBMP.Dispose();
objGra.Dispose();