SPField.SourceId property

Gets either the namespace that defines a built-in field or, if it a custom field, the GUID that identifies the list or Web site where it was created.

Namespace:  Microsoft.SharePoint
Assembly:  Microsoft.SharePoint (in Microsoft.SharePoint.dll)

'Declaration
Public ReadOnly Property SourceId As String
    Get
'Usage
Dim instance As SPField
Dim value As String

value = instance.SourceId

public string SourceId { get; }

Type: System.String
A string that contains either a namespace path or a list GUID.

SPField class

SPField members

Microsoft.SharePoint namespace