Asp.net how to create calculated column with gridview boundfield

"vb.net"
Private iTotal As Integer = 0
Protected Sub GridView_RowDataBound(sender As Object, e As GridViewRowEventArgs)
Try
' chek grid view rowtype is datarow
If e.Row.RowType = DataControlRowType.DataRow Then

iTotal += Convert.ToInt32(DataBinder.Eval(e.Row.DataItem, "Your Col Name"))
End If

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