C#

[FieldOffsetAttribute(4)]<br />
    public uint[] _private_data; // 64

[FieldOffsetAttribute(4), MarshalAs(UnmanagedType.ByValArray,SizeConst=64)]<br />
public uint[] _private_data; // 64

using System;
using System.Windows.Forms;

namespace WindowsApplication1
{
  public class MyTabControl : TabControl
  {
    private int lastSelectedIndex = 0;
    public MyTabControl() : base()
    {
      lastSelectedIndex = this.SelectedIndex;
      this.SelectedIndexChanged +=
        new EventHandler( SelectedIndexChanged );
    }

    private void SelectedIndexChanged( object sender, EventArgs e )
    {
      // Prevent someone from choosing TabPage number 3.
      if( this.SelectedIndex == 2 )
      {
        this.SelectedIndex = lastSelectedIndex;
      }
      else
      {
        lastSelectedIndex = this.SelectedIndex;
      }
    }
  }
}

Button[] buttons = new Button[ numberOfButtons ];
for( int i = 0; i < numberOfButtons; i++ )
{
  buttons[ i ] = new Button();
  buttons[ i ].Tag = i;
  buttons[ i ].Text = String.Format( "Button {0}", i );
}

Button b = ( Button ) sender;
int buttonIndex = ( int ) b.Tag;
// Now you have the index of the button!

Matrix m = new Matrix( n, m );
for( int i = 0; i < n; i++ )
{
  for( int j = 0; j < m; j++ )
  {
    m[ i, j ] = new Button();
    m[ i, j ].Tag = new int[] { i, j };
  }
}

Button b = ( Button ) sender;
int[] index = ( int[] ) b.Tag;

satish0909 wrote:

i get infinite values in the point

PointF point;
if (!float.IsInfinity(point.X) && !float.IsNaN(point.X) && 
   !float.IsInfinity(point.Y) && !float.IsNaN(point.Y))
{
}