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The AddLookup method of the SPFieldCollection class creates a lookup field in the collection of fields for a list. A lookup field refers to values from a field in another list.
Parameters
strDisplayName A string that specifies the display name of the field.
lookupListId A GUID that specifies the target list for the lookup field.
bRequired true to require that the field contain values; otherwise, false.
Return Value
A string that contains the internal name used for the field.
Example
The following code example adds a required lookup field with the specified display name and lookup ID to a list.
This example requires using directives (Imports in Visual Basic) for both the Microsoft.SharePoint and Microsoft.SharePoint.WebControls namespaces.
Requirements
Platforms: Microsoft Windows Server 2003
Security: Code Access Security