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Out of multiple forms open, I want to know which form is active?

Member 14117093 asked:

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There is a search functionality(SearchForm) where i will search the keyword in data present in forms(Let's say Form1, Form2, Form3). There are multiple forms which are open at same time. When I click on particular form(Suppose Form1) and then search for keyword, then it should search in that active form(Form1). Now, if I click on another form(Form2), then it becomes my active form. So now when I search for keyword, it should search through that particular form(Form1). Right now, if I select Form2, still it searches for keyword in Form1. How do I achieve this?

What I have tried:

I have tried Focus but I am not aware how to get the active form instance so my search functionality works on active form(which i have clicked to make it current form).
Tags: C#, Windows, Forms

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