Reading Notes: aspx development 200 Question -- determine the height and width of the uploaded image on the server side

 

Private   Void Btnget_click ( Object Sender, system. eventargs E)
{
If (Upimage. postedfile. filename ! =   "" )
{
Imgpath = Upimage. postedfile. filename;
Fileextname = Imgpath. substring (imgpath. lastindexof ( " . " ) + 1 , 3 );

If (Fileextname ! = " GIF "   && Fileextname ! =   " JPG " )
{
Response. Write ( " Select images in GIF and JPG format " );
}
Else
{
System. Drawing. Image = System. Drawing. image. fromfile (imgpath );
Txtheight. Text = Image. Height. tostring ();
Txtwidth. Text = Image. Width. tostring ();
}
}
Else
{
Response. Write ( " Select an image! " );
}
}