Question

I didn’t find any answer on web with vb.net (I find millions of samples with c#)

I translated a sample controller to vb.net but doesn’t upload

My ResimController.vb

<AcceptVerbs(HttpVerbs.Post)>
Public Function Anasayfa(ByVal forms As FormCollection) As ActionResult

    Dim errors As Boolean = False
    If String.IsNullOrEmpty(forms("Resimx")) Then
        errors = True
        ModelState.AddModelError("Resimx", "error")
    Else
        Dim sFileName As String = forms("Resimx")

        Dim file = Request.Files("Resimx")
        ''file' is always null, and Request.Files.Count is always 0 ??? 
        If file IsNot Nothing Then 'This line always returns Nothing
            Dim buf As Byte() = New Byte(file.ContentLength - 1) {}
            'do stuff with the bytes 
            file.InputStream.Read(buf, 0, file.ContentLength)
        Else
            errors = True
            ModelState.AddModelError("Resimx", "error")
        End If
    End If
    If errors Then
        Response.Write("Failed")
        Return View()
    Else
        Response.Write("Success")
        Return View()
    End If

End Function

The Anasayfa.aspx page

<%@ Page Title="" Language="VB" MasterPageFile="~/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage" %>
<%@ Register assembly="AjaxControlToolkit" namespace="AjaxControlToolkit" tagprefix="asp" %>

<asp:Content ID="Content1" ContentPlaceHolderID="TitleContent" runat="server">
    Anasayfa
</asp:Content>

<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">

    <h2>Anasayfa</h2>
    <form method="post" enctype="multipart/form-data" action="">
        <%: Html.ValidationSummary(True)%>
        <%: Html.ValidationMessageFor(Function(model) model)%>
        &nbsp;
        <input id="Resimx" name="Resimx" type="file" />
        <br />
        <br />
        <input id="Submit1" type="submit" value="submit" />
        &nbsp;
    </form>
</asp:Content>

Answer 1

The AjaxControlToolkit registration in the beginning of your view and the missing action attribute on your form raise some serious suspicions about your design. It seems that you are trying to use server side controls which is a no-no in ASP.NET MVC because they rely on viewstate and postback model.

Here’s an example of how you could implement file uploads in MVC:

Controller:

<HandleError()> _
Public Class HomeController
    Inherits System.Web.Mvc.Controller

    Function Index() As ActionResult
        Return View()
    End Function

    <HttpPost()>
    Function Index(ByVal Resimx As HttpPostedFileBase) As ActionResult
        If Not Resimx Is Nothing Then
            ' A file has been selected => do something with the uploaded file
        End If
        Return View()
    End Function
End Class

View:

<%  Using Html.BeginForm("Index", "Home", Nothing, FormMethod.Post, New With { .enctype = "multipart/form-data" })%>
    <input id="Resimx" name="Resimx" type="file" />
    <input type="submit" value="Upload" />
<% End Using %>