**比較簡單，但需要有幾點要注意的地方：
vb.net **
private sub button1_click(byval sender as system.object, byval e as system.eventargs) handles button1.click
me.progressbar1.value = 0
if openfiledialog1.showdialog() = windows.forms.dialogresult.ok then
dim filename as string = openfiledialog1.filename
dim client as webclient = new webclient()
dim querystring as system.collections.specialized.namevaluecollection = new system.collections.specialized.namevaluecollection()
querystring.add("name", "mengxianhui")
querystring.add("from", "net_lover")
client.querystring = querystring
dim uri as uri = new uri("")
addhandler client.uploadfilecompleted, addressof uploadfilecompletedcallback
addhandler client.uploadprogresschanged, addressof uploadprogresscallback
client.uploadfileasync(uri, "post", filename)
end if
end sub
private sub uploadfilecompletedcallback(sender as object, e as uploadfilecompletedeventargs)
messagebox.show("上傳完畢")
end sub
private sub uploadprogresscallback(sender as object, e as uploadprogresschangedeventargs)
me.progressbar1.maximum = 100
me.progressbar1.minimum = 0
me.progressbar1.value = e.progresspercentage
end sub
接收檔案的**
upload.aspx **
對於大檔案上傳，需要在web.config檔案裡面設定最大的請求長度
web.config **
如果檔案在上傳到50%就立即完成了，則說明伺服器端可能出現了問題。請檢查檔案是否真的儲存到了伺服器。
c# **
private void button5_click(object sender, eventargs e) }
void client_uploadfilecompleted(object sender, uploadfilecompletedeventargs e)
void client_uploadprogresschanged(object sender, uploadprogresschangedeventargs e)
作者 孟憲會
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