c# - How can i create a pictureBox manually to be exactly between two panels on form1? -

my form1 size 800,600 have 2 panels in form1 designer:

panel1 @ location: 0,24 size: 200,437 panel2 @ location: 584,24 size: 200,437

the result 2 panels @ each side of form. did in program when put mouse somewhere in form1 area showing picturebox create in form1 constructor:

pb = new animatedpicturebox.animatedpictureboxs(); pb.visible = false; pb.size = new size(500, 350); pb.location = new point((clientsize.width - pb.width) / 2,    (clientsize.height - pb.height) / 2); 

the problem new picturebox variable pb not in size fill area between 2 panels. want size of picturebox fill space between 2 panels width , height maybe leave space 5 spaces each side there border.

how can calculate picturebox size should ?

edit**

this image program working regular. on each panel on left , right added 4 pictureboxes. when move mouse cursor inside 1 of pictureboxes area showing content in larger picturebox in middle.

and how looks when put mouse cursor in 1 of pictureboxes area picturebox in middle not big enough width , height dosent make big picturebox excatly between 2 panels. big picturebox not high , not wide enough.

if want make layout stable after resizing should use dock property panels , set anchor picture box. that:

panel1.dock = dockstyle.left; panel2.dock = dockstyle.right; pb.anchor = anchorstyles.left | anchorstyles.right; 

and in general place in center can use that:

var width = this.width - panel1.width - panel1.margin.horizontal                 - panel2.width - panel2.margin.horizontal;  pb.size = new size(width, 300); // put needed height here  pb.top = this.height/2 - pb.height/ 2; pb.left = panel2.left + panel2.width + panel2.margin.right;