Asp. Net MVC controler

Hello,

I'm new to this forum.

I start with the MVC.

I tried to rephrase my question.

I need your help.

I display in a multi-selection drop-down list all the products of a connected user.

The user entered a date and validates a form.

In my controler the value of my model is always "NOTHING"

Public Class ProduitViewModel
    <Display(Name:="Produit")> _
    Property OrgList = New List(Of ProdDataModel)
 
 
    <Required> _
    Public Property SelectedValueProd() As String()
        Get
            Return p_SelectedValueProd
        End Get
        Set(value As String())
            p_SelectedValueProd = value
        End Set
    End Property
    Private p_SelectedValueProd As String()
    <Required> _
     <Display(Name:="Organisme")> _
    Public ReadOnly Property listOrg() As IEnumerable(Of SelectListItem)
        Get
            Return New MultiSelectList(OrgList, "ValueProd", "TextProd")
        End Get
    End Property
    Private p_listOrg As IEnumerable(Of MultiSelectList)
End Class
 
 
Public Class ProdDataModel
 
    Public Property ValueProd As String
        Get
            Return p_ValueProd
        End Get
        Set(value As String)
            p_ValueProd = value
        End Set
    End Property
 
    Private p_ValueProd As String
 
    Public Property TextProd As String
        Get
            Return p_TextProd
        End Get
        Set(value As String)
            p_TextProd = value
        End Set
    End Property
 
    Private p_TextProd As String
 
    Public Sub New(valueProd As String, textProd As String)
        p_ValueProd = valueProd
        p_TextProd = textProd
    End Sub
 
 
End Class
 
 
Public Class ValidationViewModel
    <Required(ErrorMessage:="La date est obligatoire")> _
    <Display(Name:="Date ")> _
    Public Property DateValidation() As String
        Get
            Return p_DateValidation
        End Get
        Set(value As String)
            p_DateValidation = value
        End Set
    End Property
    Private p_DateValidation As String
 
End Class
Public Class ValidationDataModel
    Public Validation As ValidationViewModel
    Public Property prod() As ProduitViewModel
End Class

'Validate Data:
 
 Function Index(model As ValidationDataModel) As ActionResult
        Dim t As Integer = CInt(model.Validation.DateValidation)
        Return View(model)
    End Function
 
 
'Bind DropDown LIST
 
 Function ProdView() As ActionResult
        Dim loginViewModel As LoginViewModel = New LoginViewModel()
        Dim listProd As New ProduitViewModel
        Dim listProdUser As List(Of ProdDataModel) = loginViewModel.ListeProduit
 
        For Each prod As ProdDataModel In listProdUser
            listProd.OrgList.add(prod)
        Next
        Return View(listProd)
    End Function