Can't delete specified file as it is still open in another process ?

i stitching tiff images when try delete images used create combined image unable open in process, i'm trying find out gone wrong in code allow me delete files: code below

 private void tiffyfinal()          {
	list<string> delete = new list<string>();
            system.drawing.imaging.encoder encoder1 = system.drawing.imaging.encoder.saveflag;              imagecodecinfo encoderinfo1 = imagecodecinfo.getimageencoders().first(i => i.mimetype == "image/tiff");              encoderparameters encoderparameters1 = new encoderparameters(1);              encoderparameters1.param[0] = new encoderparameter(encoder1, (long)encodervalue.multiframe);              string verbals = configurationsettings.appsettings["verbals"];              string[] fileimagesfinal = directory.getfiles(verbals);                //generate bitmap bitmap images binded              system.drawing.bitmap firstimagefinal = new system.drawing.bitmap(fileimagesfinal[0]);              //saves file file path(textbox2.text) , name of file(textbox3.text)              firstimagefinal.save(textbox2.text.tostring() + "\\" + textbox3.text.tostring()+"combine" + ".tif", encoderinfo1, encoderparameters1);                         encoderparameters1.param[0] = new encoderparameter(encoder1, (long)encodervalue.framedimensionpage);              foreach (string imagefinal in fileimagesfinal)              {                      system.drawing.bitmap bitmapfinal = new system.drawing.bitmap(imagefinal);                      //adds images firstimage multiframe tiff image.                                          firstimagefinal.saveadd(bitmapfinal, encoderparameters1);                      string filenamewithoutpath = path.getfilename(imagefinal);                                            delete.add(@verbals + filenamewithoutpath);                               }                // clear file in memory holding bitmap image data              try              {                  encoderparameters1.param[0] = new encoderparameter(encoder1, (long)encodervalue.flush);              }              catch (exception error)              {                  messagebox.show(error.message);              }                foreach (string file in delete)              {                  file.delete(file);              }                                       }

you need dispose bitmaps inherit idisposable image.

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