sharepoint custom list

Question

I have created a sharepoint custom list. List items contains various fields like name, email etc.

I want one field to be editable. Other fields should be read only.

Could anyone point in the right direction.

The other question is,

I am entering the data into sharepoint custom list thru the form created in sharepoint designer.

How can I make sure that same record will not be inserted by same logged in person.

Could anyone point me in right direction

Many thanks Hari

Answer 1

Question 1

You can use List Columns Manager from the SharePoint Tool Basket project to mark selected columns as read-only.

Question 2

You need to create list item event receiver and override the ItemAdding method to check for possible duplicates before an item is added to the list.