Add Method
The Add method of the SPFieldCollection class creates a field in the collection.
Parameters
strDisplayName A string that specifies the display name of the field.
type A Microsoft.SharePoint.SPFieldType value that specifies the type of field to create.
bRequired true to require that the field contain a value; otherwise, false.
Return Value
A string that contains the display name of the new field.
Remarks
The Add method cannot be used to create a field of type Lookup, which causes an SPException exception to be thrown. Instead use the AddLookup method to add a field of this type.
Example
The following code example adds a required text field to the specified 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