July 24, 2008 09:11pm pdt

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2. b0lsc0tt 136,067
3. jason1178 85,581
4. rowejd 64,190
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6. fibo 43,806
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8. mplungjan 40,935
9. mrcoffee... 37,994
10. logudotcom 35,150
11. ingwa 34,725
12. GreenGho... 27,914
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14. Rouchie 24,142
15. Ray_Pas... 22,917

1. rdivilbiss 779,964
2. COBOLdi... 505,389
3. OliWarner 422,264
4. b0lsc0tt 373,824
5. LeeKowal... 370,141
6. amit_g 360,877
7. PraxisWeb 313,539
8. cheekycj 284,037
9. mrichmon 256,287
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11. julianmatz 232,926
12. jason1178 219,798
13. Roonaan 212,015
14. webwoman 204,862
15. shalomc 190,749

04.01.2008 at 09:44PM PDT, ID: 23288125

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8.8

FileUpload Control Clears Its Contents When Ajax Update Panel is Updating??

Zones: Miscellaneous Web Development, Programming for ASP.NET

Tags: Microsoft, Microsoft Visual Studio 2008, 2008, ASP.NET, Microsoft Windows Internet Explorer 7, AJAX Update Panel, AJAX Update progress, FileUpload Control

Greetings Experts!
I have a problem, I hope I can describe it clearly, it is somewhat annoying and troublesome and weird. Here is what is going on:

On my aspx page, I have two textbox controls and one fileupload control and a button control, when the user click on the "btnsave" button, the page checks if the textboxes and fileupload are blank or not, if one of them is blank, then the label control associated with this textbox becomes visible. well, it is quite a long story, I have attached the code for the "btnsave" in the code snippet.

Now the problem is, the contents of the FileUpload control, after the user browse and picks up the a file with the right extention ".zip", and clicks on the "btnsave", the contents of the FileUpload control disappears and the state of "FileUpload1.HasFile" always becomes "False", so, the file uploading never takes place because it seems like as if the user never browsed for a file.

Now this problem happened only when I have placed all the controls on the page inside the "Ajax UpdatePanel", when the controls are not inside the panel, everything seems to work just fine with the FileUpload control.

I have also attached the html code for the controls inside the UpdatePanel

And the reason why I am useing an Ajax UpdatePanel control is because I need to use the "Ajax UpdateProgress" on my page.

I hope all this makes sense and someone could help me with it, I would really appreciate any kind of help or even directing me into the right way.

Thanks in advance.

~salman~

         
           
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             Protected Sub btnSave_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnSave.Click
 
 
        System.Threading.Thread.Sleep(5000)
 
 
        Dim mybyte() As Byte
        ReDim mybyte(0)
        mybyte(0) = 34
 
        Dim strTitle As String = txtTitle.Text
        If (strTitle.IndexOf("\") > -1) Or (strTitle.IndexOf("/") > -1) Or (strTitle.IndexOf("<") > -1) Or _
           (strTitle.IndexOf(">") > -1) Or (strTitle.IndexOf("*") > -1) Or (strTitle.IndexOf("|") > -1) Or _
           (strTitle.IndexOf("?") > -1) Or (strTitle.IndexOf(":") > -1) Or (strTitle.IndexOf(ASCIIEncoding.ASCII.GetString(mybyte)) > -1) Then
 
 
            lblTitleError.Text = "J,( 'F JCHF 'D9FH'F E*CHF EF '1B'E H -1HA AB7"
            lblTitleError.Visible = True
            lbldescriptionError.Visible = False
            lblUploadError.Visible = False
 
        ElseIf (txtTitle.Text = "") Then
            lblTitleError.Text = "J,( 'F *69 9FH'F 'DC*'("
            lblTitleError.Visible = True
            lbldescriptionError.Visible = False
            lblUploadError.Visible = False
 
        ElseIf (txtDescription.Text = "") Then
            lbldescriptionError.Visible = True
            lblTitleError.Visible = False
            lblUploadError.Visible = False
 
        ElseIf Not (FileUpload1.HasFile) Then
            lblUploadError.Text = "J,( 'F *.*'1 EDA 'DC*'("
            lblUploadError.Visible = True
            lbldescriptionError.Visible = False
            lblTitleError.Visible = False
        Else
 
            lblUploadError.Visible = False
            lbldescriptionError.Visible = False
            lblTitleError.Visible = False
 
 
            If (FileUpload1.HasFile = True) Then
                Dim fileExt As String
                fileExt = System.IO.Path.GetExtension(FileUpload1.FileName)
 
 
                If (fileExt = ".zip") Then
 
                    Dim titleExists As Boolean = False
                    Using myconn As New OleDbConnection(ConfigurationManager.ConnectionStrings("MasterDataFile").ConnectionString)
                        myconn.Open()
                        Using command1 As New OleDbCommand("select title from Books where title = '" & txtTitle.Text & "'", myconn)
                            command1.CommandType = CommandType.Text
                            Dim myreader As OleDbDataReader
                            myreader = command1.ExecuteReader
                            If (myreader.HasRows) Then
                                titleExists = True
                            End If
                        End Using
                        If (titleExists = True) Then
                            lblTitleError.Text = "'D9FH'F 'D0J '.*1*G E*C11 AJ B'9/) 'D(J'F'*, '.*1 9FH'F '.1"
                            lblTitleError.Visible = True
 
                        Else
                            lblTitleError.Visible = False
                            btnSave.Enabled = False
 
                            Try
                                FileUpload1.SaveAs("D:\project(2-4-2008)\Data\Books\" & txtTitle.Text & ".zip")
                                lblUploadError.Text = "File name: " & _
                                  FileUpload1.PostedFile.FileName & "<br>" & _
                                  "File Size: " & _
                                  FileUpload1.PostedFile.ContentLength & " kb<br>" & _
                                  "Content type: " & _
                                  FileUpload1.PostedFile.ContentType
 
                                Dim fileName As String = "D:\project(2-4-2008)\Data\Books\" & txtTitle.Text & ".zip"
 
                                Using mycommand As New OleDbCommand("insert into Books(title, description, file_name) values('" & txtTitle.Text & "','" & txtDescription.Text & "','" & fileName & "')", myconn)
 
                                    mycommand.CommandType = CommandType.Text
                                    mycommand.ExecuteNonQuery()
 
 
                                End Using
                                Server.Transfer("AddNewBookSuccess.aspx", False)
                            Catch ex As Exception
                                lblUploadError.Text = "ERROR: " & ex.Message.ToString()
                                lblUploadError.Visible = True
                            End Try
 
 
                        End If
 
                    End Using
 
 
                Else
                    lbldescriptionError.Visible = False
                    lblTitleError.Visible = False
                    lblUploadError.Text = "Only .zip files allowed!"
                    lblUploadError.Visible = True
                End If
 
            End If
 
 
 
 
 
        End If
    End Sub
-----------------------------------------------------------------
here is the html code:
---------------------------------------------------
<asp:Content ID="Content1" ContentPlaceHolderID="BooksChildPlaceHolder" Runat="Server">
     <asp:ScriptManager ID="ScriptManager1" runat="server">
        </asp:ScriptManager>
 
     
     <asp:UpdatePanel ID="UpdatePanel1" runat="server">
    <ContentTemplate >
     <table width="100%">
   
    
    <tr>
    <td colspan = "2" align = "center">
      
    <asp:Label ID="lblHeader" runat = "server" Font-Size="X-Large" 
            Font-Underline="True" >'6'A) C*'( ,/J/</asp:Label>
        <br />
        <br />
    </td>
    
    </tr>
  
 
 
  
<tr>
<td  align="center">
 
<asp:Label id= "lblTitleError" runat = "server" 
        Text="J,( 'F JCHF 'D9FH'F E*CHF EF '1B'E H -1HA AB7" Visible = "False" 
        BackColor="Yellow" Font-Size="Large" Width="100%" ></asp:Label>
 
    <br />
<asp:TextBox ID="txtTitle" runat = "server" MaxLength="255" Width="100%" 
        CssClass="TextStyle"></asp:TextBox>
<br />
 
</td>
<td align="center">
<asp:Label ID="label1" runat ="server" Font-Size="Large" >9FH'F 'DC*'(</asp:Label>
</td>
</tr>
 
 
 
<tr>
<td align="center">
 
<asp:Label id= "lbldescriptionError" runat = "server" 
        Text="J,( 'F *69 E.*51 DDC*'( B(D 9EDJ) 'D-A8" Visible = "False" 
        BackColor="Yellow" Font-Size="Large" Width="700px" ></asp:Label>
 
    <br />
<asp:TextBox ID="txtDescription" runat = "server" MaxLength="255" Width="700px" 
        CssClass="TextStyle" Height="69px" TextMode="MultiLine" ></asp:TextBox>
</td>
<td align="center" >
<asp:Label id="label2" runat = "server" Font-Size="Large">E.*51 'DC*'(</asp:Label>
 
</td>
</tr>
 
 
<tr>
<td  align="center" colspan = "2">
 
<asp:Label id= "lblUploadError" runat = "server" Visible = "False" 
        BackColor="Yellow" Font-Size="Large" Width="100%" ></asp:Label>
 
    <br />
    <asp:FileUpload ID="FileUpload1" runat="server" Font-Size="Large" EnableViewState = "true"   />
 
</td> 
 
</tr>
 
 
<tr>
<td  align="center" colspan = "2">
 
    <br />
     
  
  <asp:Button   ID="btnSave" runat="server" Font-Size="Large" Text="-A8 'DC*'("  />
 
<br />
 
 
 
     
    
          
  
 
</td> 
 
 
 
 
</tr>
 
 
 
</table> 
 
 </ContentTemplate>
    </asp:UpdatePanel>
 
     
 
  
  <table width = "100%">
  <tr>
  <td align = "center" >
  <asp:UpdateProgress ID="UpdateProgress1" runat="server"  >
      <ProgressTemplate>
      <br /><br />
      <asp:Image ID="myimage" runat = "server" ImageUrl ="~/images/progress.gif" 
              Height="61px" Width="67px" />
      <br />
      <br />
      <asp:Label ID="mylabel" runat = "server" Text="Processing Request.........." 
              Font-Size="X-Large"></asp:Label>
      
 </ProgressTemplate>
  </asp:UpdateProgress>
  </td>
  </tr>
  
  </table>
 
 
 
  
</asp:Content>

           
         

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Question Stats

Zone: Web Development

Question Asked By: salman_sulaiman_2008

Solution Provided By: emoreau

Participating Experts: 1

Solution Grade: A

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