VB replacing an object in a list - vb.net

Question

I have 2 lists approvedSuppliers and originalSupplierData
When approved Suppliers gets populated we clone the entry into the originalSupplierData . If they have modified a record but don't save we ask the user if they want to revert the changes . If they want to revert I am trying to replace the entry in approved suppliers with a clone of the original data. My current code for the revert is
Public Sub RevertChanges(SupplierID As Integer)
Dim orignalSupplier As Approved_Supplier = originalSupplierlist.Where(Function(x) x.ID = SupplierID).Single()
Dim modifiedSupplier As Approved_Supplier = ApprovedSuppliers.Where(Function(x) x.ID = SupplierID).Single()
modifiedSupplier = orignalSupplier.Clone
End Sub
The modifiedSupplier gets updated with the original values however the actual item in the list is not updated with the values.
If I modify one of the properties the list gets update. I am not sure what i am doing wrong can anyone point me in the right direction please?
Edit
The code for populating the list from the database is
supplierTableAdapter.Fill(supplierTable)
_approvedSuppliers = New List(Of Approved_Supplier)
originalSupplierlist = New List(Of Approved_Supplier)()
For Each row As ApprovedSuppliersDataset.ApprovedSupplierRow In supplierTable
supplier = New Approved_Supplier()
supplier.supplierID = row.PLSupplierAccountID
supplier.AccountNumber = row.SupplierAccountNumber
supplier.SupplierName = row.SupplierAccountName
supplier.SupplierAddress = CompileAddress(row)
supplier.Phone = CompilePhoneNumber(row)
If row.IsIDNull = False Then
supplier.ID = row.ID
If row.IsAdded_ByNull = False Then
supplier.AddedBy = row.Added_By
End If
If row.IsApprovedNull = False Then
supplier.Approved = row.Approved
End If
If row.IsAuditorNull = False Then
supplier.Auditor = row.Auditor
End If
If row.IsAudit_CommentsNull = False Then
supplier.AuditComments = row.Audit_Comments
End If
If row.IsAudit_DateNull = False Then
supplier.AuditDate = row.Audit_Date
End If
If row.IsDate_AddedNull = False Then
supplier.DateAdded = row.Date_Added
End If
If row.IsNotesNull = False Then
supplier.Notes = row.Notes
End If
If row.IsQuestionnaire_Return_DateNull = False Then
supplier.QuestionnaireReturnDate = row.Questionnaire_Return_Date
End If
If row.IsQuestionnaire_Sent_DateNull = False Then
supplier.QuestionnaireSentDate = row.Questionnaire_Sent_Date
End If
If row.IsQuestionnaire_StatusNull = False Then
supplier.QuestionnaireStatus = row.Questionnaire_Status
End If
If row.IsReplinNull = False Then
supplier.Replin = row.Replin
End If
If row.IsReview_CommentsNull = False Then
supplier.ReviewComment = row.Review_Comments
End If
If row.IsReview_DateNull = False Then
supplier.ReviewDate = row.Review_Date
End If
If row.IsReviewerNull = False Then
supplier.Reviewers = row.Reviewer
End If
If row.IsStakeholder_ContactNull = False Then
supplier.StakeholderContact = row.Stakeholder_Contact
End If
If row.IsStandardsNull = False Then
supplier.Standards = row.Standards
End If
If row.IsStandard_ExpiryNull = False Then
supplier.StandardExpiry = row.Standard_Expiry
End If
If row.IsStatusNull = False Then
supplier.Status = row.Status
End If
If row.IsSupplier_Expiry_DateNull = False Then
supplier.SupplierExpiryDate = row.Supplier_Expiry_Date
End If
If row.IsSupplier_ScopeNull = False Then
supplier.SupplierScope = row.Supplier_Scope
End If
If row.Is_T_CsNull = False Then
supplier.TC = row._T_Cs
End If
End If
supplier.ClearISDirty()
_approvedSuppliers.Add(supplier)
originalSupplierlist.Add(supplier.Clone)
Next
and for the clone we have
Public Function Clone() As Object Implements ICloneable.Clone
Dim cloned As New Approved_Supplier()
cloned.ID = Me.ID
cloned.DateAdded = Me.DateAdded
cloned.Status = Me.Status
cloned.AddedBy = Me.AddedBy
cloned.Approved = Me.Approved
cloned.AuditDate = Me.AuditDate
cloned.Auditor = Me.Auditor
cloned.AuditComments = Me.AuditComments
cloned.QuestionnaireStatus = Me.QuestionnaireStatus
cloned.QuestionnaireSentDate = Me.QuestionnaireSentDate
cloned.QuestionnaireReturnDate = Me.QuestionnaireReturnDate
cloned.ReviewDate = Me.ReviewDate
cloned.Reviewers = Me.Reviewers
cloned.ReviewComment = Me.ReviewComment
cloned.Standards = Me.Standards
cloned.StandardExpiry = Me.StandardExpiry
cloned.SupplierScope = Me.SupplierScope
cloned.Replin = Me.Replin
cloned.TC = Me.TC
cloned.Notes = Me.Notes
cloned.StakeholderContact = Me.StakeholderContact
cloned.SupplierExpiryDate = Me.SupplierExpiryDate
cloned.supplierID = Me.supplierID
cloned.AccountNumber = Me.AccountNumber
cloned.SupplierName = Me.SupplierName
cloned.SupplierAddress = Me.SupplierAddress
cloned.Phone = Me.Phone
cloned.Email = Me.Email
cloned.ClearISDirty()
Return cloned
End Function

Answer 1

You are not replacing in the list by affecting modifiedSupplier.
Try by getting the index of the modifiedSupplier and then replacing the item at the found index by your clone.
Public Sub RevertChanges(SupplierID As Integer)
Dim orignalSupplier As Approved_Supplier = originalSupplierlist.Where(Function(x) x.ID = SupplierID).Single()
Dim modifiedIndex As Integer = ApprovedSuppliers.FindIndex(Function(x) x.ID = SupplierID)
ApprovedSuppliers(modifiedIndex) = orignalSupplier.Clone()
End Sub