Detecting concurrency errors after updating data (VB) : SqlDataSource « ADO.net Database « ASP.Net






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  2. ADO.net Database
  3. SqlDataSource

Detecting concurrency errors after updating data (VB)

<%@ Page Language="VB" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">
    Protected Sub SqlDataSource1_Updated(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.SqlDataSourceStatusEventArgs)
        If (e.AffectedRows > 0) Then
            Message.Text = "The record has been updated"
        Else
            Message.Text = "Possible concurrency violation"
        End If
    End Sub
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:SqlDataSource ID="SqlDataSource1" 
                           Runat="server" 
                           SelectCommand="SELECT * FROM [Customers] WHERE ([CustomerID] = @CustomerID)"
                           ConnectionString="<%$ ConnectionStrings:AppConnectionString1 %>"
                           DataSourceMode="DataSet"
                           ConflictDetection="CompareAllValues" 
                           OnUpdated="SqlDataSource1_Updated">
            <SelectParameters>
                <asp:QueryStringParameter Name="CustomerID" 
                                          QueryStringField="id" 
                                          Type="String">
                </asp:QueryStringParameter>
            </SelectParameters>
        </asp:SqlDataSource>
        <asp:Label ID="Message" runat="server" Text="Label"></asp:Label>
    </div>
    </form>
</body>
</html>








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