Mega Code Archive
Prevent concurrency conflict
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The ConflictDetection property can have one of the following two values:
CompareAllValues
OverwriteChanges
<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<script runat="server">
protected void srcProducts_Updated(object sender, SqlDataSourceStatusEventArgs e)
{
if (e.AffectedRows == 0)
lblMessage.Text = "Could not update record";
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>Concurrency</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Label ID="lblMessage" EnableViewState="false" runat="server" />
<asp:GridView
id="grdProducts"
DataSourceID="srcProducts"
DataKeyNames="Id"
AutoGenerateEditButton="true"
Runat="server" />
<asp:SqlDataSource
id="srcProducts"
ConflictDetection="CompareAllValues"
OldValuesParameterFormatString="original_{0}"
ConnectionString="<%$ ConnectionStrings:Products %>"
SelectCommand="SELECT Id,Title,Director FROM Products"
UpdateCommand="UPDATE Products SET Title=@Title, Director=@Director
WHERE Id=@original_Id AND Title=@original_Title AND Director=@original_Director"
Runat="server"
OnUpdated="srcProducts_Updated" />
</div>
</form>
</body>
</html>
File: Web.config
<configuration>
<connectionStrings>
<add name="Products"
connectionString="Data Source=.\SQLEXPRESS;
AttachDbFilename=|DataDirectory|MyDatabase.mdf;Integrated Security=True;User Instance=True" />
</connectionStrings>
</configuration>
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