How to make a particula cell ACTIVE using C#
 

I am using Excel Spreadsheet Active X control. In my application, I would
like to restrict the user from entering anything but numbers in a column.
When he enters an invalid input (not a number), I display an error message
box. I want that cell to retain the foucs. At present, it is moving to the
next row in the column.

I surely could use some expert's help in this.

Thank you much

Srini