problem with the New sub in my custom control

[maged]

Dear all,

i am building a small control that inherits from the textbox, i am doing this so that i can preset some properties of the textbox so that when i drag them into my form in design view i dont need to adjust each one properties.


the problem is with the text property.

here is my code for the control

Public Class mytxtbox
    Inherits System.Windows.Forms.TextBox
    Sub New()
        MyBase.New()
        Me.MaxLength = 10
        Me.Text = 0
        Me.RightToLeft = Windows.Forms.RightToLeft.Yes
 
    End Sub

now when i drag the new control from the toolbox to my form it is pulled down with all the properties setup as i want Except for the text propert
it is always mytxtbox1 instead of 0 as i preset it in the new sub


Waiting ur answer

RGDS

[Lil Ms Squirrel]

You need to set all of the properties using the MyBase keyword so instead of Me.Text, use MyBase.Text.

[maged]

i tried it

doesn't work

any other suggestions


|THx in advance

[wossname]

Try making it a Public Sub New.

[wossname]

You need to set all of the properties using the MyBase keyword so instead of Me.Text, use MyBase.Text.

That would only happen if you had local variables of the same name and you specifically didn't want to change them.

[maged]

i tried the public new with no difference

the very strange thing that is all other properties are set as i need but only the text property don't ?????


i can ignore it and change it from design form but i need to understand to learn better


thx for your replies

[RobDog888]

The Name property comes from the UC Class name - mytxtbox + 1 or whatever instances you have created.

If you want the Text property to be defaulted to something then did you create a Public Property of Text?

[RobDog888]

Here is a sample of the Text property for a UC control.

Private _Text As String = "" 
 
    <Browsable(True), DefaultValue("0"), Category("Appearance")> _
    Public Shadows Property Text() As String
        Get
            Return _Text
        End Get
        Set(ByVal Value As String)
            _Text = Value
        End Set
    End Property

[maged]

first of all thank you for your reply RobDog888

i need to understand what is the Shadow means ??? and why is it necessary to have this line

<Browsable(True), DefaultValue("0"), Category("Appearance")>

i know what is overloading and overriding but it is the first time to get in touch with Shadows thing ??

can you explain more


thx again for your kind answers

RGDS

[RobDog888]

Ok, to start the line is an attribute tag that you get when you declare "Imports System.ComponentModel"
at the very top of your class.

"<Browsable(True)," means that in the property grid window you can "browse" the property
or is "visible" so to speak.
If you change it to False then it will be hidden from the property grid.

"DefaultValue("0")," means that "0" will be the default property value for the property. If you change a
property from its default value the value will become bold in the property grid. Also, when you right
click on the property in the grid you get a popup menu that has two menuitems on it - "Reset"
and "Description". Reset will change the property value back to your specified default value of "0". The Description
menuitem will turn the HelpText panel on or off.

"Description("The TabPages in the control." Description is the "description" that displays in the help text window below
the prop grid like shown in the TabPages description.



"Category("Appearance")>" means where you are placing the property categorically. If you look at
your property grid window you will see:

• Accessibility
• Appearance
• Behavior
• Configurations
• Data
• Design
• Focus
• Layout
• Misc

So when its all put together you have several options plus more that I didnt get into.

<Browsable(True), DefaultValue("0"), Category("Appearance"), Description("MyTextBox Control is great!")> _
Public Shadows Property Text() As String
    Get
        Return _Text
    End Get
    Set(ByVal Value As String)
        _Text = Value
    End Set
End Property

Note: there is a line wrap underscrore designator so it can attach to the Public Property blah bah...

Now the "Shadows" part of it is required because the "Text" property is a built-in windows default
property. We need to attach to the windows text property so we can modify it instead of having errors
or duplicate Text properties.


There is allot to cover for user controls. I just learned all this a few weeks ago and I now see the real
depth with user controls and its not fun. , but the result is

[maged]

thx a million RobDog888 , that is really nice of you

understood


Again thx, and you can count that i will vote for your sake in this thread

C u soon i hope

BST RGDS