protected override void OnLoad(EventArgs e)
{
try
{
// The 'using' construct below results in a call to Dispose on exiting the
// curly braces. It could be replaced with an explicit call to Object.Dispose
// This is a C#-specific construct.
//
// It is important to dispose COM+ objects as soon as possible so that
// COM+ metadata such as context does not remain in memory unnecessarily
// and so that COM+ services such as Object Pooling work properly.
using (TXDemoServer txDemoServer = new TXDemoServer())
//we want the object to be disposed immediately
{
// Retrieve & display the current value
currentValue.Text = txDemoServer.RetrieveCurrentValue().ToString(CultureInfo.CurrentCulture);
}
}
catch (CurrentValueNotReadException)
{
MessageBox.Show("Unable to read the current value from the database"
, "Error");
Application.Exit();
}
catch (Exception ex)
{
MessageBox.Show("An exception was caught : " + ex.Message +
"\nUnable to launch the COM+ Server. Closing the application.",
"Error");
Application.Exit();
}
}
// Start the Post with a manual transaction if the user clicks on the
// Post button
private void Post_Click(object sender, System.EventArgs e)
{
int val = 0;
try
{
val = int.Parse(newValue.Text, CultureInfo.CurrentCulture);
}
catch
{
MessageBox.Show("Please enter a value to post!");
return;
}
try
{
// The 'using' construct below results in a call to Dispose on exiting the
// curly braces. It could be replaced with an explicit call to Object.Dispose
// This is a C#-specific construct.
//
// It is important to dispose COM+ objects as soon as possible so that
// COM+ metadata such as context does not remain in memory unnecessarily
// and so that COM+ services such as Object Pooling work properly.
using (TXDemoServer txDemoServer = new TXDemoServer())
//we want the object to be disposed immediately
{
txDemoServer.Post(val);
}
}
catch (DatabaseExecutionException)
{
MessageBox.Show("Unable to update the database", "Error");
return;
}
catch (Exception ex)
{
MessageBox.Show("An exception was caught : " + ex.Message);
return;
}
try
{
// The 'using' construct below results in a call to Dispose on exiting the
// curly braces. It could be replaced with an explicit call to Object.Dispose
// This is a C#-specific construct.
//
// It is important to dispose COM+ objects as soon as possible so that
// COM+ metadata such as context does not remain in memory unnecessarily
// and so that COM+ services such as Object Pooling work properly.
using (TXDemoServer txDemoServer = new TXDemoServer())
//we want the object to be disposed immediately
{
currentValue.Text = txDemoServer.RetrieveCurrentValue().ToString(CultureInfo.CurrentCulture);
}
}
catch (CurrentValueNotReadException)
{
MessageBox.Show("Unable to read the current value from the database",
"Error");
return;
}
}
