System.InvalidCastException Int32 to guid

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VB

ADO.NET

My SQL database (RatingDbSQL) has 3 tables and the 'Persons' table comprises:
Column(0) as Unique ID;
Column(1) FirstName as String; Column(2) LastName as String.

The database Provider is: .NET Framework Data Provider for SQL Server

The data loads from the Database OK using:

ConRatingDB.Open()
Me.PersonsTableAdapter.Fill(Me.DsRatingDbSQL.Persons)
daPersons.Fill(DsRatingDbSQL, "Persons")
ConRatingDB.Close()

The other two tables are non starters until I resolve saving data to the Persons Table using the following:
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The first line (Update) returns with:
System.InvalidCastException – Failed to convert parameter value from a Int32 to a Guid

daPersons.Update(DsRatingDbSQL.Tables("Persons"))
DsRatingDbSQL.Tables("Persons").Clear()
daPersons.Fill(DsRatingDbSQL, "Persons")

The Properties of the ID column are:
DataType: UniqueIdentifier
Length: 16
Nullable: False

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I have read many Internet articles on similar problems but don’t understand how to implement them:

The following three look interesting – but I’m lost on how to implement:
Guid guid = new Guid(sqlCmd.Parameters["@UserID"].Value.ToString())
Or:
Dim ID as String = commandArgs(0).ToString()
Dim FirstName as String = commandArgs(1).ToString()
Dim LastName as String = commandArgs(2).ToString()
Or:Dim i as Integer
Public Overridable Function GetGuid(ByVal i As Integer) As Guid Implements IDataRecord.GetGuid

Could anyone advise please