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How to display/populate a property of a custom control with a dropdown style

P: n/a
Hello,

I have written my own custom control and I want one of its properties to
display as a dropdown list when clicked, so the user can select from the
list, it would be similar to the asp textbox control which has a 'TextMode'
property and when clicked on, displays as a dropdown list with 3 values, I
want to have a similar type property with a dropdown style.

So far, I have a property defined which displays the dropdown arrow when
clicked but does not expand, I also do not know how to populate the
dropdown. The dropdown needs to be populated with values read from the DB,
the values can be read into a Dataset/datareader (which I can do), so I need
to know how to bind these to a dropdown and have the dropdown assigned to
the property. So far I have the following:

1.. My control
Imports System

Imports System.Web.UI

Imports System.Web.UI.WebControls

Imports System.ComponentModel

Imports System.Text

Imports System.Drawing

Imports UniversalDropdownEditor

Namespace CustomAddressControl

<DefaultProperty("Title"), ToolboxData("<{0}:Address
runat=server></{0}:Address>")_

Public Class Address

Inherits System.Web.UI.WebControls.WebControl

Private iDataSource As String

<Description("The source/origin of the data."), _

Editor(GetType(EntryModeEditor), _

GetType(System.Drawing.Design.UITypeEditor))_

Public Property DataSource() As String

Get

Return iDataSource

End Get

Set(ByVal Value As String)

iDataSource = Value

End Set

End Property

.......

2.. My EntryModeEditor Class
Imports System

Imports System.ComponentModel

Imports System.ComponentModel.Design

Imports System.Drawing

Imports System.Drawing.Design

Imports System.Windows.Forms

Imports System.Windows.Forms.Design

<System.Security.Permissions.PermissionSetAttribut e(System.Security.Permissions.SecurityAction.Deman d,
Name:="FullTrust")_

Public Class EntryModeEditor

Inherits System.Drawing.Design.UITypeEditor

Public Overloads Overrides Function EditValue(ByVal context As
System.ComponentModel.ITypeDescriptorContext, ByVal provider As
IServiceProvider, ByVal value As Object) As Object

Dim returnValue As Object = value

If Not (provider Is Nothing) Then

'I DO NOT KNOW WHAT SHOULD GO IN HERE, TO POPULATE THE DROPDOWN AND GET OUT
THE VALUE THAT WAS SELECTED

End If

Return value

End Function

Public Overloads Overrides Function GetEditStyle(ByVal context As _

System.ComponentModel.ITypeDescriptorContext) As _

System.Drawing.Design.UITypeEditorEditStyle

If context Is Nothing Then

Return MyBase.GetEditStyle(context)

Else

Return System.Drawing.Design.UITypeEditorEditStyle.DropDo wn

End If

End Function

End Class

Any help/suggestions would be gratefully appreciated.

Thanks,

Kay.
Oct 25 '06 #1
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