Add total automatically

Hi Experts,

I need Experts help. How to add automatically total sum of data (time) from column TimeIN and TimeOUT at column Total_Duration. At present the data was not automatically count at Total_Duration column. Hope Experts will help create this feature.

Imports MyCompany.Data
Imports System
Imports System.Collections.Generic
Imports System.Data
Imports System.Linq
Imports System.Text.RegularExpressions
Imports System.Web

Namespace Rules
    
    Partial Public Class DataBusinessRules
        Inherits MyCompany.Rules.SharedBusinessRules
        
        <RowBuilder("Data", RowKind.New)>  _
        Public Sub BuildNewData()
            UpdateFieldValue("Total_Duration", "(datediff(HOUR,[TimeIN],[TimeOUT]))")
        End Sub
    End Class
End Namespace

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