C#

public static List<Point> SelectX<T>( this List<Point> PointCollection)
        {
            List<Point> pointCollectionSelected = new List<Point>();


            pointCollectionSelected = from i in PointCollection
                                    where  i.X == 50
                                    select i;
                                    
            return pointCollectionSelected;
        }

private void ecgDisplay_Paint(object sender, PaintEventArgs e)
        {
            
           
            ////we are drawing on the form itself
            //Graphics g = ecgDisplay.CreateGraphics();

            //traverse through the points one by one to get moving graphs
            for (int i = 0; i < ECGArray.Length; i++)
            {

                if (x > ecgDisplay.Width) x = 0;
                x += 1;

                //draw ECG
                p = 80 - (ECGArray[i] / 6 + 50);
                //e.Graphics.DrawLine(yelgpen, px, pp, x, p);
                e.Graphics.DrawLine(yelgpen, px, pp + 30, x, p + 30);


                //draw erasebar to erase previous content at current location
                e.Graphics.DrawRectangle(blackpen, 0, 0, x + 1, ecgDisplay.Height);
                
                //store current point as previous point
                pp = p;
                pq = q;
                pr = r;
                px = x;


            }

           
        }

Button dynamicButton = new Button();<br />
                    dynamicButton.Name = "dynamicButton" + i.ToString();<br />
                    dynamicButton.Width = 75;<br />
                    dynamicButton.Height = 23;<br />
                    dynamicButton.Left = left;<br />
                    dynamicButton.Top = 10 + (dynamicButton.Height * i) + (10 * i);<br />
                    dynamicButton.Text = valuename.ToString();<br />
                    dynamicButton.Click += new EventHandler(Button_Click); //hook the Click event<br />
                    panel4.Controls.Add(dynamicButton);

private void drawEcg()
        {
            const int scaleX = 40;
            const int scaleY = 40;
            Point ecgDisplayTopLeft = new Point(0, 0);
            Point ecgDisplayTopLeftMinus1 = new Point(-1, 0);

            int halfX = ecgDisplay.Width / 2;
            int halfY = ecgDisplay.Height / 2;
            Size size = new Size(halfX + 20, ecgDisplay.Height);

            Graphics g = ecgDisplay.CreateGraphics();
            g.TranslateTransform(halfX, halfY);
            g.ScaleTransform(scaleX, scaleY);
            g.Clear(Color.Black);
            g.ResetClip();

            float lastY = (float)Math.Sin(0);
            float y = lastY;
            Pen p = new Pen(Color.White, 0.01F);
            float stepX = 1F / scaleX;

            for (float x = 0; x < 10; x += stepX)
            {
                // code to draw the graph based on ecg data
            }
        }