您需要更改web.config:

You need to change you web.config:

<configuration>
  <system.web>
    <httpRuntime maxRequestLength="4096" />
  </system.web>
</configuration>

默认值为4096kb.您需要将此值更改为10240，才能上传10mb.

The default value is 4096kb. You need to change this value to 10240 for 10mb uploading.