Comments on: Data Binding with a Custom UserControl’s Text Property

By: PavlinII

PavlinII — Wed, 14 Oct 2009 09:34:12 +0000

Great article! I wish I found it last night

I’ve came across the same issue last night and tried almost everything else except checking OnTextChanged procedure.

Thanks!

By: hurcane

hurcane — Sun, 22 Feb 2009 21:24:29 +0000

Lior,

I can’t provide a specific answer to your problem. However, you can put a breakpoint on the OnTextChanged line in your code to see the call stack that leads to it.

I can make a wild guess, though. I suggested putting OnTextChanged in the Validating event because that worked for our needs. I know that the Validation events can do some strange things when a MenuStrip or ToolStrip control is involved.

By: Lior

Lior — Sun, 22 Feb 2009 01:35:01 +0000

… this means that this solution is doing something different from the default behaviour

By: Lior

Lior — Sun, 22 Feb 2009 01:32:30 +0000

I got a form with a user-control and a toolbar with a button. when I click the button i commit the changes to the database.
The problem is that the “TextChanged” event is fire after saving changes. When I change the property name from “Text” to something else, everything works fine. any idea?

By: Yev

Yev — Tue, 03 Feb 2009 21:15:45 +0000

Mike, in your response, what is TextChanged? an event of the usercontrol? How is it wired?

By: Mike

Mike — Fri, 02 Jan 2009 22:15:38 +0000

Good blog. Ran into this exact same problem and your advice pointed me in the right direction. here’s the C# that fixed it. Do a google on implementing INotifyPropertyChanged.

Assume a UserControl with a single TextBox for simplicty.

[System.ComponentModel.DefaultBindingProperty("Text")]
public partial class MinMaxTextBox : UserControl, INotifyPropertyChanged
{

[Bindable(true)]
public override string Text
{
get { return txtData.Text; }
set { txtData.Text = value; }
}

private void txtData_TextChanged(object sender, EventArgs e)
{
if (TextChanged != null)
{
TextChanged(sender, e);
}
PropertyChanged(this, new PropertyChangedEventArgs(“Text”));
}
}