1. Capture with Fiddler packet;
2. Copy WebForms parameters to the Parameters in Jmeter; Parameters name fiddler retain only the WebForms name value;
3. FIG circled in red box entry no need to write the Parameters Jmeter; it needs to write in Files Upload Jmeter;
4. The following diagram, the file name of a local file save path; value of the value parameter name name of the figure above, the MIM type is the Content-Type;
5. The last step is very important, click jmeter advanced options requested to select java implementation