c# - Validate uploaded file as image and then get the dimensions of it -

i want upload image file ftp server, have asyncfileupload control on asp.net page. using following code type of asyncfileupload1.postedfile , trying dimensions of having no luck far.

string ctype =asyncfu.postedfile.contenttype; if (ctype.contains("image")) {    stream ipstream = asyncfu.postedfile.inputstream;    image img = system.drawing.image.fromstream(ipstream); //error comes here, can't think work around this.    int w = img.physicaldimension.width;    int h = img.physicaldimension.height; } 

as can see, errors message says cannot convert system.drawing.image system.web.ui.webcontrols.image. understand error, cannot think work around this.

i have asyncfileupload control unknown file uploaded, saved ftp server if image file.

any suggestions?

try :

stream ipstream = fuattachment.postedfile.inputstream;         using (var image = system.drawing.image.fromstream(ipstream))         {                                 float w = image.physicaldimension.width;             float h = image.physicaldimension.height;         }