Supressing the ctrl-c and other keys during word automation in automation

[apondu]

Hi,

can someone help me and provide me the information on how to supress
the
default action of the shortcut keys of word during word automation.

I am using C#.Net

I have written a code but it generates a exception "Object Reference
not set
to an instance of a object".

I have posted my code here, can someone take a look at it and help in
understand and help me to get the solution for this

Word._Application app = null;

object c = Word.WdKey.wdKeyC;

object ctrl = Word.WdKey.wdKeyControl;

object mykey = null;

word.KeyBindings.ClearAll();

mykey =
word.KeyBindings.Add(Word.WdKeyCategory.wdKeyCategoryCommand,"DoSomeThing",app.BuildKeyCode(Word.WdKey.wdKeyControl,
ref c, ref missing, ref missing),ref missing,ref missing);

Here DoSomething is a dummy function

public void DoSomeThing()
{
}

It would be great if someone could help me.

My mail id is (e-mail address removed)

Thanks for the help

Regards,
Govardhan