problems with mdi forms c#

I'm having a few problems with some child forms. I set the Locked field to True because I dont want the user to be able to move the form, but they still can move it. I also try and center the form in the Parent form and it does not do anything. Here is my code:

in MainCOE form under form_Load:

LoadVendor l = new LoadVendor();
l.MdiParent = this;
l.Show();

in LoadVendor under form_Load:

CenterToParent();

When I run, the form shows up properly but i can move it around and it is also not centered. Any ideas?
mbosicoAsked:
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C_Sharp_ProgrammerCommented:
To center the MDI Child Form, use:

l.StartPosition = FormStartPosition.CenterScreen;

Yes, even if your MDI Parent Form isn't centered, the child form will be centered in the parent form.

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TheAvengerCommented:
You cannot make the child form stay fixed in the parent form by just chaning a property. You can try catching move events and returning the form in the center every time the user tries to change the position. You can do this by writing the following code in your child form class' code:

protected override void WndProc( ref Message m )
{
  const int WM_NCLBUTTONDOWN = 161;
  const int WM_SYSCOMMAND = 274;
  const int HTCAPTION = 2;
  const int SC_MOVE = 61456;

  if ( (m.Msg == WM_SYSCOMMAND) && (m.WParam.ToInt32() == SC_MOVE) )
    return;
  if ( (m.Msg == WM_NCLBUTTONDOWN) && (m.WParam.ToInt32() == HTCAPTION) )
    return;

  base.WndProc( ref m );
}  

mbosicoAuthor Commented:
thanks guys

is there a reason why the CenterToParent() method didnt do anything?
C_Sharp_ProgrammerCommented:
CenterToParent() will only work if you have, say, a button (child) on a form (parent).  You cannot make a top level control (a form) a child (i.e. to another form), therefore there is nothing to center it to!
mbosicoAuthor Commented:
thanks, makes sense
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