public class Form1 : System.Windows.Forms.Form {

public static float WXmin;
public static float WYmin;
public static float WXmax;  
public static float WYmax;  
public static int   VXmin;
public static int   VYmin;
public static int   VXmax;
public static int   VYmax;  
public static float Vx; 
public static float Vy;

public Form1()
{
  InitializeComponent();
}

private void InitializeComponent()
{
  //this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
  this.ClientSize = new System.Drawing.Size(400, 300);
  this.Text="Pass Args";
  this.Paint += new System.Windows.Forms.PaintEventHandler(this.doLine);
}

static void Main() 
{
  Application.Run(new Form1());
}

private void doLine(object sender, System.Windows.Forms.PaintEventArgs e)
{
  Graphics g = e.Graphics;
  g.FillRectangle(Brushes.White, this.ClientRectangle);
  Pen p = new Pen(Color.Black);
  g.DrawLine(p, 0, 0, 100, 100);  
  p.Dispose();
}

private void eachCornerPix (object sender, PaintEventArgs e, out float Wx, out float Wy, out float Vx, out float Vy)
{
  Graphics g = this.CreateGraphics();
  Pen penBlu = new Pen(Color.Blue, 2);
  SolidBrush redBrush = new SolidBrush(Color.Red);
  int width = 2;    // 1 pixel wide in x
  int height = 2;
  float [] Wxc = {0.100f, 5.900f, 5.900f, 0.100f}; 
  float [] Wyc = {0.100f, 0.100f, 3.900f, 3.900f}; 
  for (int i = 0; i<3; i++)
  {
    Wx = Wxc[i];
    Wy = Wyc[i];
    Vx = ((Wx - WXmin)*((VXmax-VXmin)+VXmin)/(WXmax-WXmin));  
        Vy = ((Wy - WYmin)*(VYmax-VYmin)/(WYmax-WYmin)+VYmin); 
        Console.WriteLine("eachCornerPix Vx= {0}", Vx);
        Console.WriteLine("eachCornerPix Vy= {0}", Vy);
        g.FillRectangle(redBrush, Vx, Vy, width, height);
    g.Dispose();
  }
    // Desired effect: Use the array values (Wxc, Wyc) and re-assign them to Wx and Wy. Then use
    // Wx and Wy as components to calculate Vx and Vy.
    // My end goal...once compile issues are resolved, is to pass each array value listed
    // using this method. This should allow 4 xy point pairs to be plotted. 

    // Errors:
    // pass1.cs(51,18): error CS0177: The out parameter 'Wx' must be assigned to before
    // control leaves the current method
            // pass1.cs(51,18): error CS0177: The out parameter 'Wy' must be assigned to before
    //  control leaves the current method
            // pass1.cs(51,18): error CS0177: The out parameter 'Vx' must be assigned to before
    // control leaves the current method
            // pass1.cs(51,18): error CS0177: The out parameter 'Vy' must be assigned to before
    // control leaves the current method

}