In order to achieve your scenario please try to set the Name Field as Text and Year field as Id of RadAutoCompleteBox. Based on the value of the selected entries you can write your code. Please have a look into the following C# code snippet to access all the selected entries of RadAutoCompleteBox.
sender, EventArgs e)
count = RadAutoCompleteBox1.Entries.Count;
index = 0; index < count; index ++)
value = RadAutoCompleteBox1.Entries[index].Value;
//here it will return the value of the selected entries
//from this you can access all the database item with corresponding value
Another Suggestion is that please try to set the Name as Text Filed and ID as Id Field of RadAutoCompleteBox and from code behind access the Year Field of each selected entry using the ID.