not maintain the elements DataTable

[Don Quijote de Nicaragua]

Hello, desire to know so that it does not maintain the elements previously
added
'Español
Hola, deseo saber por que no mantiene los valores agregados.
Gracias

Private Sub btnAgregarOtro_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles btnAgregarOtro.Click
dt.Columns.Add("Codigo", GetType(String))
dt.Columns.Add("Descripcion", GetType(String))
dt.Columns.Add("Valor", GetType(Integer))
dr = dt.NewRow()
dr(0) = "AA"
dr(1) = "BBBB"
dt.Rows.Add(dr)
grdGeneral.DataSource = dt
grdGeneral.DataBind()
End Sub
Don Quijote de Nicaragua.