How to get an access to an object of form in another class?

Question

C#, Windows Forms
Hello everyone!
I have got a really annoying problem. I have got my class "World_Class" and method "Create_World()" in it. Also i have Form1 with picturebox. "Create_World" has

Form1 form1 = new Form1();
form1.picturebox.Location = new Point(100,100);

And on button press in form1.cs I wrote

World_Class world = new World_Class();
world.Create_World();

And i expected that for my picturebox will be set new location, but nothing happened. Picturebox has "public" access modifier. I tried many ideas from internet but nothing helped. Thank you in advance.
P.s. sorry for my bad eng(

Answer 1

Many questions in a short text.
Your english is understable

Does it work when you change the location on form1 itself.
Put a button on form1 and try to change the location of the picturebox in the onclick event

Actually it is bad practice to change a form-control propertie in another form.

Make a public method on form1.
public PictureBoxChangeLocation (int x, int y)
{
form1.picturebox.Location = new Point(x,y);
}
Call this in your other form
form1.PictureBoxChangeLocation (100,100);

Does it work when you call invalidate or refresh.
To force the picturebox to be redrawn

Answer 2

It helped me, thanks a lot !)