I modified Page_Load event handler of VACIO.aspx.vb file into the following and find that the message "Postback executed" is no longer appear when user click the button.

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        If Not IsPostBack Then
            DisplayAlert("Postback executed", "", Tipomensaje.MsgInfo)
        End If
    End Sub

Please let us know whether it helps or not.

the postbak is still executed.. only the message is not show with your solution..

we need not postback on button press

regards

Hi Ernesto Barrera,

As an alternative, you could prevent postback event from being fired using javascript.
The solution would be something like bellow.

1. Create javascript function that will prevent postback event :

function prevent(event) {
	/* do something here */
	
	// Prevent the default event and Prevent the event from bubbling up
	event.preventDefault();
	event.stopPropagation();
	return false;
}

2. Attach that function to the button mousedown event.

Protected Sub WGridGestiontareas_InitializeRow(sender As Object, e As RowEventArgs)
	If e.Row.Type = RowType.Record Then
		Dim customObjectAttributes As String = " onmousedown = ""prevent(event)"" type = ""button"""
		e.Row.Cells.GetNamedItem("ACTIVAR").CustomObjectAttributes =  customObjectAttributes
	End If
End Sub

Please let us know whether this solution work at your end.

Regards.