How to select a file using Browse Button in dialog box in AX 2012

/*
Below code will help you to select the file in the dialog box using Browse Button.
*/

static void Esh_FileOpen(Args _args)
{

Dialog dialog;
DialogField dialogField;
Filename filename;
;

dialog = new Dialog('FileOpen');
dialogfield = dialog.addField(extendedTypeStr(Filenameopen), 'File Name');
dialog.run();

if (dialog.run())
{
filename = (dialogfield.value());
}

info(filename);

}