How to save pen and bursh drawing on picture box in C#

thanks GURU.
till yet with your help , map can be saved now with area selected by me , i am trying to add some text on it now .
i need more help from you, i have attached the updated work , just review it .

kindly help me regarding following topics
1. Prevent to Overwrite/ Overdraw on already selected lines
(for this either on paint event i should take array which hold positions of already drawn lines and on mouse / paint / event i should check that either lines are already drawn .)
2. Erase lines / selection
3. enlarge particullar selection


best Regards

Polygons are not a control. You will have to save all the points to a file on disk
To do this you could use serialization
http://blog.csharphelper.com/2010/12/17/use-xml-serialization-to-save-and-restore-pictures-drawn-by-the-user-in-c.aspx
To enlarge you could copy a rectangle slightly bigger than your polygon into a picturebox that has sizemode set to stretched
To delete or edit unsure till I get further information
Tackle one part at a time -ie: Do the saving polygons first, then upload your project so we can work out a way to edit

thanks for giving me your time. thanks for your guidance.
1.how can i edit (enlarge , particular sketched area , delete ).  
2. I need to save  what ever i draw on picture  box  so for doing that i did this
 private void button1_Click(object sender, EventArgs e)
        {
            Control.ControlCollection coll = this.Controls;
            foreach (Control c in coll)
            {
                if (c != null)
                MessageBox.Show("ControlName"+c.Name.ToString()+" - Location  X  ="+c.Location.X.ToString()+"Location Y="+c.Location.Y.ToString());
            }
        }

above code does not recognize polygons as control object.  as i need to save the location and with their object name ..how can i do that.?

Regards

It looks like a polygon eg:
http://blog.csharphelper.com/2010/06/11/let-the-user-draw-polygons-in-c.aspx

No excatly cropping , i want to highlight any specific area of map , like we do in wikimapia
exmaple : http://wikimapia.org/#lat=24.8667&lon=67.05&z=10&l=0&m=b
open this link you find a map with option of "Add place" option

wikimapia highlight area of map and we can save it . Excalty in that way i have a picture  box contain map in background i want to select any area using floating line (as it is in viki mapia)  and wants to save and rease it .

any idea how to do that