I need to modify the simple insert command code here

Code:
    
    Private Sub SaveButton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles SaveButton.Click  
            Dim connectionString As String = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=|DataDirectory|\DataGridSaveDB.accdb;Persist Security Info=True" 
            ' If you are using Sql server replace "OleDb" with "Sql" for example  
            ' OleDBConnection --> SqlConnection  
            ' OleDbCommand    --> SqlCommand  
            Using connection As New OleDbConnection(connectionString)  
     
                Dim cmdText As String = "INSERT INTO DGV (ColumnA, ColumnB, ColumnC) VALUES (@ColumnA, @ColumnB, @ColumnC)" 
                Dim command As New OleDbCommand(cmdText, connection)  
                command.Parameters.Add(New OleDbParameter("@ColumnA", OleDbType.VarWChar))  
                command.Parameters.Add(New OleDbParameter("@ColumnB", OleDbType.VarWChar))  
                command.Parameters.Add(New OleDbParameter("@ColumnC", OleDbType.VarWChar))  
     
                connection.Open()  
                Dim transaction As OleDbTransaction = connection.BeginTransaction()  
                command.Transaction = transaction  
     
                Try 
     
                    For i As Integer = 0 To DataGridView2.Rows.Count - 2  
                        command.Parameters("@ColumnA").Value = DataGridView2.Rows(i).Cells(0).FormattedValue  
                        command.Parameters("@ColumnB").Value = DataGridView2.Rows(i).Cells(1).FormattedValue  
                        command.Parameters("@ColumnC").Value = DataGridView2.Rows(i).Cells(2).FormattedValue  
                        command.ExecuteNonQuery()  
                    Next i  
     
                    transaction.Commit()  
                Catch ex As Exception  
     
                    Try 
                        transaction.Rollback()  
     
                    Catch rollBackEx As Exception  
                        MessageBox.Show(rollBackEx.Message)  
                    End Try 
     
                End Try 
     
            End Using  
     
        End Sub
it is Effective But I need to add a condition which is: Add only the rows where the column 4 is checked

Note: the type of Column 4 is DataGridViewCheckBoxColumn



thank you