c# - reduce image size (physical and dimensions) coming from HttpPostedFileBase then convert to base64 -

does have example of converting image file coming httppostedfilebase reduced size , converting image base64? i've spent hours on out luck. here start of code. of hardcoded (image size).

this giving me black image when place base64 in image tag , view in browser.

    public actionresult upload(httppostedfilebase file, decimal? id, decimal? id2)     {                                     image img = image.fromstream(file.inputstream, true, true);              var bitmap = new bitmap(img.width - 100, img.height - 100);              system.io.memorystream stream = new system.io.memorystream();             bitmap.save(stream, system.drawing.imaging.imageformat.bmp);             byte[] imagebytes = stream.toarray();             string base64string = convert.tobase64string(imagebytes);             insertimage(base64string);      } 

i'm asking how change image convert base64. more specific question called duplicate.

i have never used httppostedfilebase myself. so, simplified problem bit, should try future questions. should try narrow focus as possible. said, here method reduces dimensions of image represented stream , returns new image array of bytes.

    private static byte[] reducesize(filestream stream, int maxwidth, int maxheight)     {         image source = image.fromstream(stream);         double widthratio = ((double)maxwidth) / source.width;         double heightratio = ((double)maxheight) / source.height;         double ratio = (widthratio < heightratio) ? widthratio : heightratio;         image thumbnail = source.getthumbnailimage((int)(source.width * ratio), (int)(source.height * ratio), abortcallback, intptr.zero);         using (var memory = new memorystream())         {             thumbnail.save(memory, source.rawformat);             return memory.toarray();         }     } 

you can call method this:

public actionresult upload(httppostedfilebase file, decimal? id, decimal? id2) {     byte[] imagebytes = reducesize(file.inputstream, 100, 100);     string base64string = convert.tobase64string(imagebytes);     insertimage(base64string); } 

my reducesize() method maintains aspect ratio. may not need that, , may want change arguments can change how specify how resized. give shot , let me know how does.