How to transpose datas from form1 to from2?

There are many ways to tackle this issue. Take a look at my two blog posts on the subject:

http://geek-goddess-bonnie.blogspot.com/2011/01/passing-data-between-forms.html

http://geek-goddess-bonnie.blogspot.com/2012/12/passing-data-between-forms-redux_31.html

The third option in the first blog post (using Interfaces) is probably the most relevant to your question.

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~~Bonnie Berent DeWitt [C# MVP]

http://geek-goddess-bonnie.blogspot.com