How to write data to Excel 2007 using VB.Net?

Hey, all.
I met a problem, how can I write data to an Excel 2007 file by using VB.Net (3.5)? For example, the data in a TextBox will be written to the excel file very 30 seconds.
I searched on the Internet for a while, but none of the codes worked for me and the description is not clear not all. Please give me a hand with a piece of code to help me understand, I just started to learn VB for one month.
Thank you very much for your time in advance