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2010-11-05T17:28:33.607
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2010-11-05T17:28:33.607
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<p>It does spawn in a different thread!! You can create a simple Windows Application to test this, and you'll see how the OnChange handler can't modify any UI controls directly (you'd get something like "Cross-thread operation not valid: Control XXX accessed from a thread other than the thread it was created on"). To overcome this, you call BeginInvoke.</p> <p>Here's a simple Windows application to test SqlDependencies (I hope you can imagine the UI).</p> <pre><code>using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Data.Linq; using System.Data.Linq.SqlClient; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; using System.Data.SqlClient; namespace TestSqlDependancies { public partial class SqlDependencyTester : Form { SqlDependency sqlDepenency = null; SqlCommand command; SqlNotificationEventArgs msg; public Form1() { InitializeComponent(); } private void label1_Click(object sender, EventArgs e) { } public delegate void InvokeDelegate(); void sqlDepenency_OnChange(object sender, SqlNotificationEventArgs e) { msg = e; this.BeginInvoke(new InvokeDelegate(Notify)); } private void Notify() { listBox1.Items.Add(DateTime.Now.ToString("HH:mm:ss:fff") + " - Notfication received. SqlDependency " + (sqlDepenency.HasChanges ? " has changes." : " reports no change. ") + msg.Type.ToString() + "-" + msg.Info.ToString()); } private void button1_Click(object sender, EventArgs e) { SetDependency(); } private void SetDependency() { try { using (TicketDataContext dc = new TicketDataContext()) { SqlDependency.Start(dc.Connection.ConnectionString); command = new SqlCommand(textBox1.Text, (SqlConnection)dc.Connection); sqlDepenency = new SqlDependency(command); sqlDepenency.OnChange += new OnChangeEventHandler(sqlDepenency_OnChange); command.Connection.Open(); command.ExecuteReader(); } } catch (Exception e) { listBox1.Items.Add(DateTime.Now.ToString("HH:mm:ss:fff") + e.Message); } } } } </code></pre>
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1. POSQLDependency thread
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1. PTAnswer
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1. USDiego
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Guidance

A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.