Urgent Help!!Crystal Report,RadioBtnList problem and Print Function using C#

Question

hi all, i had encounter 2 problems while doing my project: (1) i'm using Crystal report to create an invoice. I need to get details for a particular invoiceID for instance: i want all details of invoiceID1 only, however, the crystal report give me the entire Invoice table's data! I heard that there's a way to solve this problem which is by passing parameter to the report...anyone here knows how to do it?i'll appreciate if there are detailed step by step procedure explained with C# code. By the way, i'm using a webform to generate the crystal report. (2) i'm using radiobtnlist and dropdownlist control in my webform. What code should i type inorder for the application to determine which option the user had selected and immdiately after the user selection, it will be updated to the database... For instance: Option A Option B The user had selected option A, immediately the selected option will be recorded into the database...what is the C# code to do so? (3) Anyone knows the C# code for prinnt function in webform? Let's say i want to print a form, there are 2 button: Print Preview and Print. What is the C# code for this 2 button in webform? Hope there's someone help me with this!thks alot!i really needs to know the codes,urgent!