Question

I have a main form window which will pop up a new form window. I want to lock the location of the popup form so that the window cannot be moved and it will move at the same time as the main form.
(so if a user drags the main form the popup moves with it)

Did a search on the site and some did it like this:

this.FormBorderStyle=System.Windows.Forms.FormBorderStyle.None

and I have the Locked attribute set to True but that doesn’t work.

But I want to keep the borders. What’s the proper way of locking a form?

Answer 1

public class Form1
{
    private Form2 Form2 = new Form2();
    private Point form2Location;
    private Point form1Location;
    private void Button1_Click(System.Object sender, System.EventArgs e)
    {
        form1Location = this.Location;
        Form2.Show();
        form2Location = Form2.Location;
    }

    private void Form1_Move(System.Object sender, System.EventArgs e)
    {
        Form2.IsMoving = true;
        Point form2OffSetLocation = new Point(this.Location.X - form2Location.X, this.Location.Y - form2Location.Y);
        Form2.Location = form2OffSetLocation;
        Form2.IsMoving = false;
    }
}    

public class Form2
{

    public bool IsMoving;
    private void Form2_Move(System.Object sender, System.EventArgs e)
    {
        if (IsMoving) return; 
        if (staticLocation.X != 0 & staticLocation.Y != 0) this.Location = staticLocation; 
    }

    private Point staticLocation;
    private void Form2_Load(System.Object sender, System.EventArgs e)
    {
        staticLocation = this.Location;
    }
}

I agree with Hans on this one and I think once you see how dodgy it looks you’ll probably agree too.