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how can I open an excel file from my forms?

I have a subreport generated in a report. In the report i have a calculated field which is the sum of 2 values one in the report and one in the subreport. The subreport is not generated when it has no data. In this case the calculated field is "#Error". What Can I do?

I need to set a text box visible or invisible according to its value. If value = 0 set to invisible Else set to visible Where should i write the code??

When I write Date() in a report it takes it in the format mm/dd/yyyy. I need it to be in the format dd/mm/yyyy. How do I do that?

In a query, I need to get the third digit of a student ID. Is there any way to do that?

In a report I need to force a new page only when there's no enough space for the whole section.

What i need is really simple. It consits of numbering the records I have in my report. Can anybody tell me how?