> A beginners question to someone that isn't a beginner ;) I've forgotton
> a lot.
>
> The code below isn't what I want to do but it demonstrates succinctly
> my problem. I want to drop a "MyTextBox" control on a form at design
> time, set the "DummyProperty" property to be "test value1", and I want
> to see it showing at design and runtime "test value1". It shows a
> blank. If I do this with the "Text" property it works but not with my
> "DummyProperty" property. When I set the "DummyProperty" at runtime, it
> sets the value and updates the textbox correctly. Why? I wouldn't
> normally ask someone to correct my code but on this occasion I would
> really appreciate it this jump start. Sample code below.
>
> Thanks in advance
> Barry
>
>
> using System;
> using System.Collections.Generic;
> using System.ComponentModel;
> using System.Drawing;
> using System.Data;
> using System.Text;
> using System.Windows.Forms;
>
>
> namespace Test
> {
>     public class MyTextBox : TextBox
>     {
>         public MyTextBox()
>         {
>             InitializeComponent();
>             this.Text="test value2";
>         }
>
>         [Browsable(true), NotifyParentProperty(true), Bindable(true),
>          Description("Dummy text control")]
>         public String Dummyproperty
>         {
>             set { this.Text = value;  }
>             get { return this.Text; }
>         }
>
>         private void InitializeComponent()
>         {
>             this.SuspendLayout();
>             //Nothing here
>             this.ResumeLayout(false);
>         }
>
>     }
> }

> First of all, there should be no need to use the NotifyParentProperty
> attribute. That is used for properties that have complex substructure.
>
> Second, probably the reason this isn't working is that your
> manipulating one Designer-visible property from inside another, and in
> so doing you've created a sort of "race" situation. You may have
> noticed that the Designer writes code to implement the settings you set
> while in design mode. The way you've written this, if the Designer
> decides to generate the code this way:
>
> myTextBox1.DummyProperty = "test value 1";
> myTextBox1.Text = "";
>
> then both properties will end up being blank, whereas if it generates
> code like this:
>
> myTextBox1.Text = "";
> myTextBox1.DummyProperty = "test value 1";
>
> then both properties will contain "test value 1". This is because the
> Designer doesn't know that modifying DummyProperty modifies Text, too,
> and vice versa. Now, if you were to create a string field to store the
> contents of DummyProperty, and thus separate it completely from the
> Text property, you would probably see more rational behaviour:
>
> public class MyTextBox : TextBox
> {
>     private string _dummy;
>
>     [Browsable(true), Bindable(true), Description("Dummy text
> control"), DefaultValue("")]
>     public String DummyProperty
>     {
>         set { this._dummy = value;  }
>         get { return this._dummy; }
>     }
>
> Finally, you can't just set a Designer-visible property in the
> constructor and expect the Designer to sort that out. You need to use
> the DefaultValue attribute on the property to indicate to the Designer
> what its default value is.
>
> Barry wrote:
> > A beginners question to someone that isn't a beginner ;) I've forgotton
> > a lot.
> >
> > The code below isn't what I want to do but it demonstrates succinctly
> > my problem. I want to drop a "MyTextBox" control on a form at design
> > time, set the "DummyProperty" property to be "test value1", and I want
> > to see it showing at design and runtime "test value1". It shows a
> > blank. If I do this with the "Text" property it works but not with my
> > "DummyProperty" property. When I set the "DummyProperty" at runtime, it
> > sets the value and updates the textbox correctly. Why? I wouldn't
> > normally ask someone to correct my code but on this occasion I would
> > really appreciate it this jump start. Sample code below.
> >
> > Thanks in advance
> > Barry
> >
> >
> > using System;
> > using System.Collections.Generic;
> > using System.ComponentModel;
> > using System.Drawing;
> > using System.Data;
> > using System.Text;
> > using System.Windows.Forms;
> >
> >
> > namespace Test
> > {
> >     public class MyTextBox : TextBox
> >     {
> >         public MyTextBox()
> >         {
> >             InitializeComponent();
> >             this.Text="test value2";
> >         }
> >
> >         [Browsable(true), NotifyParentProperty(true), Bindable(true),
> >          Description("Dummy text control")]
> >         public String Dummyproperty
> >         {
> >             set { this.Text = value;  }
> >             get { return this.Text; }
> >         }
> >
> >         private void InitializeComponent()
> >         {
> >             this.SuspendLayout();
> >             //Nothing here
> >             this.ResumeLayout(false);
> >         }
> >
> >     }
> > }