Name of form instance

Question

Hi,

 

I create form and from few mwnu option create instance of it with diferent nama of instance. It is a data input form and I use it for input data in 5 tables with diferent column names, so I have to know the name of instance. Menu option coud open only one instance in a time. need help, I'm very new in C#.

 

All the best from Croatia....