want the suitable size of form1 to draw curve

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C#

Visual-Studio

C#4.0

I want to draw curve on form1
In order to fit the curve fully across the height and width of form1
I have to know the size of both width and hieght of the form1
But I am diturbed from where should I get the height and width of form1
Because the curve did not appeared on form1 unless I changed the data

The data of curve are

double qad[360] along x(horizontaly)
vesus
double d[360] along y (vertically)

double wid,hi,Rax,Ray, maxValue_X, maxValue_Y;
int x1,y1,x2,y2,i;
 Pen pen0 = new Pen(Color.Red);
 Graphics Mye = base.CreateGraphics();
 //Graphics Mye = this.CreateGraphics();//may be I should use this
 Graphics Mye = base.CreateGraphics();
            Rax = wid / maxValue_X ;
            Ray = hi / maxValue_Y ;
            for (i = 0; i < 360-1; i++)
            {
                x1 = (int)(Rax * qad[i]);     y1 = (int)(Ray*d[i]);
                x2 = (int)(Rax * qad[i + 1]); y2 = (int)(Ray*d[i + 1]);
Mye.DrawLine(pen0, x1, y1, x2, y2);
            }

Should I use

this.WindowState = FormWindowState.Maximized;
wid= Form1.ActiveForm.ClientSize.Width-2*fontx;
hi=Form1.ActiveForm.ClientSize.Height-2*fontx;

Or

this.WindowState = FormWindowState.Maximized;
wid = this.ClientSize.Width - 2* fontx;
hi = this.ClientSize.Height - 2* fontx;