how can we retrive custom object records through Visualforce and modification through visualforce

Hello

I'm trying to use an apex trigger to update the value of a picklist field on a related object. The trigger will execute when a custom object is inserted and then retrive a list of all the Tasks associated with the custom object.

I then want to change the 'Status' field (which is a picklist field) on the tasks.

Does anyone have any sample code for changing picklist field values in Apex?

Thank you.