Readonly propert of a Textbox

[=?Utf-8?B?Unlhbg==?=]

How do I override a Readonly property of a textbox control in a custom
Textbox control?

[Marc Gravell]

It isn't virtual, so you can't. What do you need to do?

Marc

[=?Utf-8?B?Unlhbg==?=]

I have created a custom Textbox control. When this control is placed on a
form; the ReadOnly property is not available.
I have implemented some properties, code below, but don't know exactly how
to implement Readonly property:
using System.Drawing;
using System.Data;
using System.Text;
using System.Windows.Forms;

namespace MyControls
{

public partial class MyTextBox : UserControl
{
public string currentText;
public delegate void TextChangedHandler(object MyTextBox,EventArgs e);
public event TextChangedHandler OnTextChange;
public MyTextBox()
{
InitializeComponent();
baseTextBox.Text = "";

}
protected override void OnGotFocus(EventArgs e)
{
base.OnGotFocus(e);

}
protected override void OnLostFocus(EventArgs e)
{
base.OnLostFocus(e);

}

"Marc Gravell" wrote:

It isn't virtual, so you can't. What do you need to do?

Marc

[Ignacio Machin ( .NET/ C# MVP )]

On Sep 3, 11:16*am, Ryan <[e-mail]:

I have created a custom Textbox control. When this control is placed on a
form; the ReadOnly property is not available.
I have implemented some properties, code below, but don't know exactly how
to implement Readonly property:

using System.Drawing;
using System.Data;
using System.Text;
using System.Windows.Forms;

namespace MyControls
{

* * public partial class MyTextBox : UserControl
* * {
* * * * public string currentText;
* * * * public delegate void TextChangedHandler(object MyTextBox,EventArgs e);
* * * * public event TextChangedHandler OnTextChange;
* * * * public MyTextBox()
* * * * {
* * * * * * InitializeComponent();
* * * * * * baseTextBox.Text = "";

* * * * }
* * * * protected override void OnGotFocus(EventArgs e)
* * * * {
* * * * * * * * base.OnGotFocus(e);

* * * * }
* * * * protected override void OnLostFocus(EventArgs e)
* * * * {
* * * * * * * * base.OnLostFocus(e);

* * * * }

"Marc Gravell" wrote:

It isn't virtual, so you can't. What do you need to do?

Marc- Hide quoted text -

- Show quoted text -

And how your control is a textbox? You are deriving from UserControl,
no Textbox

[Marc Gravell]

By the "baseTestBox", it rather looks like you have *encapsulated* a
TextBox - i.e. you have a UserControl that *contains* a TextBox. In
which case, just add a pass-thru ReadOnly property:

public bool ReadOnly
{
get {return baseTextBox.ReadOnly;}
set {baseTextBox.ReadOnly = value;}
}

For info, the overrides you have added don't do anything, so should be
removed. There is no need to declare a custom delegate - this
signature is the same as EventHandler, which is expected by several
binding frameworks. The event could again be a pass-thru, except this
would obscure the sender. For info, the event should be called
TextChanged if you want binding notifications to work.

But I suspect you might get more joy by simply inheriting from
TextBox.

Marc