Populate TextBox From Public Property From Code-Behind - asp.net

Question

I am trying to use a property from the code-behind to populate a textbox instead of using in the code-behind textbox.text=. I am using vb.net. Here is the code for the aspx page:
<asp:Content ID="Content2" ContentPlaceHolderID="MainContentPlaceHolder" runat="server">
<asp:TextBox runat="server" ID="roleTextBox" Text='<%# CurrentRole.Name%>'></asp:TextBox>
</asp:Content>
Here is the code behind code:
Imports Compass.UI.components
Imports Compass.Core.Domain
Imports Compass.Core.Domain.Model
Namespace app.administration.Roles
Partial Public Class edit
Inherits ClaimUnlockPage
Private _roleRepository As IRoleRepository
Private _roleId As Integer
Private _role As Role
Public Property CurrentRole() As Role
Get
Return _role
End Get
Set(ByVal value As Role)
_role = value
End Set
End Property
Public Property RoleRepository() As IRoleRepository
Get
Return _roleRepository
End Get
Set(ByVal value As IRoleRepository)
_roleRepository = value
End Set
End Property
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
LoadRole()
End Sub
Private Sub LoadRole()
_roleId = Config.RequestVal("id", Request)
_role = _roleRepository.GetById(_roleId)
End Sub
End Class
End Namespace
When I run the page the text box is empty.

Answer 1

I didn't see roleTextBox.text=value in your code! in LoadRole or anywhere.
And if you try to bind it, you need a static class for Role.
Just for testing try to add the following line in LoadRole
Private Sub LoadRole()
_roleId = Config.RequestVal("id", Request)
_role = _roleRepository.GetById(_roleId)
roleTextBox.text =CrrentRole.Name;
End Sub
if the roleTextBox is still empty then the CurrentRole.Name is empty.

Answer 2

As far as I know you can't bind a property of a control like this (I wish you could but I've never been able to figure out or find an example how to). The way I've always done it is create a protected function to return e.g.
Protected Function GetCurrentRoleName() As String
Return CurrentRole.Name
End Function
And in your markup bind like so
Text='<%# GetCurrentRoleName() %>'

Answer 3

You have to DataBind the container-control which contains your Textbox(f.e. a GridView,UserControl,etc.). So at least your aspx-page must be databound.
"When called on a server control, this method resolves all data-binding expressions in the server control and in any of its child controls."
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
Me.CurrentRole = New Role("Administrator")
Me.DataBind() '!!!!!!!
End Sub
Private _currentRole As Role
Protected Property CurrentRole() As Role
Get
Return _currentRole
End Get
Set(ByVal value As Role)
_currentRole = value
End Set
End Property
Public Class Role
Public Sub New(ByVal name As String)
Me.Name = name
End Sub
Public Name As String
End Class
Then you can use your aspx-code to set the TextBox'-text property.