Insert, update, delete in a windows form

Question

Hello,

I am a beginner in working with C# windows applications. I have a form with text boxes and a combobox and I want to insert, update and delete values from all the boxes on the form.

Can anybody recommend me a web site with an example please? The textboxes and datetime picker should be connected with one table and the combobox is filled with data from another and I chose one value to enter in the first table.

Thank you very much in advance.