Hi there!

[Listing 11-16. Page-343]

Message Property not exists :)


<script runat="server">

protected void SqlDataSource1_Updated(object sender, SqlDataSourceStatusEventArgs e)
    {
        if (e.AffectedRows > 0)
            Message.Text = "The record has been updated";
        else
            Message.Text = "Possible concurrency violation";
    }

</script>
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Fix
Create a simple Label Control, and type Label.Text instead Message.Text


<script runat="server">

//Listing11-6 Detecting Concurrency errors after updating Data
    protected void SqlDataSource1_Updated1(object sender, SqlDataSourceStatusEventArgs e)
    {
        if (e.AffectedRows > 0)
        {
            Label1.Text ="The record has been updated";
        }
        else
        {
            Label1.Text = "Possible concurrency violation";
        }
    }
</script>