OK, the text form value is not converted to zero but to null, so the shown error is "field required". BUT.... If I insert in the form a character, for example, can I have a message type "int required" instead of the "field required" (shown even if in user inserts something!)???
I’ve looked at a lot of different solutions, and in my humble opinion Aspose is the way to go. Here’s the link: http://aspose.com