Thanks Ael GCHandle worked well And it solved my problem. Shaju Mathew

Thanks... Heath Stewart The tips helped .. But i cannot change class to struct. Since struct won't allow the same struct as a member Shaju Mathew

Hai all... I was trying to pass a class to an Unmanaged function. The class has a member of type, of the same class. Is it possible to pass a Managed class(Class having a member of it's own type) to an Unmanaged function. Thanks in advance:rose: Below is what i did... This is the class i created to pass into an Unmanaged function as parameter [StructLayout(LayoutKind.Explicit )] public class MyWindow { [FieldOffset (0)] public String className; [FieldOffset (16)] public String caption; [FieldOffset (32)] public MyWindow child ; } But if i remove the class member 'child' from the class it works well. Unmanaged function Decleration [DllImport("user32")] public static extern bool EnumChildWindows(int hwndParent, EnumChildDelegare lpEnumFunc, MyWindow lParam) ; This is the way how i call the unmanaged function MyWindow m = new MyWindow (); Win32Calls.EnumChildWindows (winHandle,w.enumChildDlgate ,m); And i am getting this error. An unhandled exception of type 'System.TypeLoadException' occurred in CSRecorder.exe Additional information: Can not marshal field child of type CSRecorder.MyWindow: This type can not be marshaled as a structure field. Shaju Mathew

Thanks......... Heath Stewart . Let me try. Regards Shaju MAthew

Hai, Sreejith As u told if i change the Cursor property of my Form or control, it will only change the cursor of my form. ie if i move the mouse out of my applications area then the cursor will be the cursor of the application below the cursor. But i want to have my cursor for the entire windows opened. You can see this behaviour of cursor in MS Spy. Thanks Shaju

Thanks Sreejith.. But that didnot solve my problem Because i want to change the entire desktop's cursor, ie the cursor of all applications. Not just my applications or forms cursor Thanks Shaju

Hi, I am developing an application like MS Spy. How can i change the mouse pointer of the entire desktop from my c# application. The mouse pointer should behave like the Finder Tool in the Microsoft Spy. Kindly give some idea. Thanks in advance Shaju Mathew

hai there, i need your valuable information. i would like to create a text editor using c#. i got a trouble in displaying line numbers on left side of the TextBox Also i want the feature 'Add Breakpoint' in a panel near the texteditor. How can we get the position of a cursor with respect to the control. Thanks in advance. Regards, Shaju :)