How to create the formula bar of excel in c sharp?

Question

Hi,

I'm trying to create my own formula bar just as excel in a windows application using C# as the language. I'm unable to figure out the functionality of it. How does the formula bar displays the formula when we select the content of a cell which has the calculated value example: if a cell has a calculated value say =25/5, the cell has the final output as 5 and the formula bar displays the formula as =25/5. I have two text boxes named text1 and text2 and Access as the database. text1 should have the calculated value and text2 should show the calculation part. Kindly help me solve this problem.

Thanks and regards,
Somnath Naskar.