measure mouse movements

sudhara,

Resolved?

Try this:
bool mouseDown = false;
Point pt1, pt2;
Rectangle rct;
public Form1()
{
InitializeComponent();
}
private void Form1_MouseDown(object sender, MouseEventArgs e)
{
mouseDown = true;
pt1.X = e.X;
pt1.Y = e.Y;
}
private void Form1_MouseMove(object sender, MouseEventArgs e)
{
if (mouseDown == true)
{
Graphics g = this.CreateGraphics();
this.Refresh();//can create region instead of refreshing entire form
pt2.X = e.X;
pt2.Y = e.Y;
if (pt2.X > pt1.X && pt2.Y > pt1.Y)//top left to bottom right
{
pt2.Y = pt1.Y + (pt2.X - pt1.X);//needed for square
rct = rct = Rectangle.FromLTRB(pt1.X, pt1.Y, pt2.X, pt2.Y);
}
else if (pt2.X > pt1.X && pt2.Y < pt1.Y)//bottom left to top right
{
pt2.Y = pt1.Y - (pt2.X - pt1.X);//needed for square
rct = rct = Rectangle.FromLTRB(pt1.X, pt2.Y, pt2.X, pt1.Y);
}
else if (pt2.X < pt1.X && pt2.Y > pt1.Y)//top right to bottom left
{
pt2.Y = pt1.Y - (pt2.X - pt1.X);//needed for square
rct = rct = Rectangle.FromLTRB(pt2.X, pt1.Y, pt1.X, pt2.Y);
}
else if (pt2.X < pt1.X && pt2.Y < pt1.Y)//bottom right to top left
{
pt2.Y = pt1.Y + (pt2.X - pt1.X);//needed for square
rct = rct = Rectangle.FromLTRB(pt2.X, pt2.Y, pt1.X, pt1.Y);
}
label1.Text = Convert.ToString(rct.Width);
label2.Text = Convert.ToString(rct.Height);
g.DrawRectangle(Pens.Black, rct);
}
}
private void Form1_MouseUp(object sender, MouseEventArgs e)
{
mouseDown = false;
}

it is really very easy...

namespace WindowsFormsApplication1
  {
  public partial class Form1 : Form
    {
    int xBegin, yBegin,w, h;
public Form1()
      {
      InitializeComponent();
      }

    private void Form1_Load(object sender, EventArgs e)
      {

      }

    private void Form1_MouseDown(object sender, MouseEventArgs e)
      {
      xBegin = e.X;
      yBegin = e.Y;

      }

    private void Form1_MouseMove(object sender, MouseEventArgs e)
      {
      w = e.X - xBegin;
      h = e.Y - yBegin;
      Text = w.ToString() + " - " + h.ToString();
     
      }
    }
  }


this is JUST the basics

xBegin and yBegin are the start points on the screen.

w is the width (start point of x - end point of x (e.X))
H is the Height (start point of y - end point of y (e.Y))

all you need to do now is to work out how to draw a rectangle..

It helps to know what terminology to use, then you can search for it. Look at the folllowing; I hope it helps.
 
http://social.msdn.microsoft.com/Search/en-US?query=mouse%20drag%20draw%20rectangle&ac=3

Intresting question...

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