Hi friends i have a error in my file upload control. i select the file that i want to upload, but when i click the upload button. its give the this error. i dont know why this error come.

Error:

Object reference not set to an instance of  an object.

here is my Upload Button Code code

protected void Button2_Click(object sender, EventArgs e)
    {
        string strFileName;
        strFileName = FileField.PostedFile.FileName;
        string c = System.IO.Path.GetFileName(strFileName);
        try
        {
            Image2.Visible = true;
            FileField.PostedFile.SaveAs("C:\\UploadedUserFiles\\" + c);
            Image2.Visible = false;
            Label2.Visible = true;
        }
        catch (Exception exp)
        {
            Label2.Text = exp.Message.ToString();
            Label2.Visible = true;
        }
    }

Here is My page Code

<table cellpadding="0" cellspacing="0" class="style8">
                                        <tr>
                                            <td style="font-family: Arial, Helvetica, sans-serif; font-size: 10pt; font-weight: bold; color: #535353; text-align: right; padding-right: 10px; height: 30px" width="150px">
                                                *Name:</td>
                                            <td width="275px">
                                                <asp:TextBox ID="TextBox2" runat="server" Width="250px"></asp:TextBox>
                                                </td>
                                            <td style="font-family: Arial, Helvetica, sans-serif; font-size: 10pt; color: #FF0000; padding-left: 10px; text-align: left" width="150px">
                                                 </td>
                                        </tr>
                                        <tr>
                                           <td style="font-family: Arial, Helvetica, sans-serif; font-size: 10pt; font-weight: bold; color: #535353; text-align: right; padding-right: 10px; height: 30px" width="150px">
                                                *Email Address:</td>
                                            <td width="275px">
                                                <asp:TextBox ID="TextBox4" runat="server" Width="250px"></asp:TextBox>
                                                </td>
                                            <td style="font-family: Arial, Helvetica, sans-serif; font-size: 10pt; color: #FF0000; padding-left: 10px; text-align: left" width="150px">
                                                 </td>
                                        </tr>
                                        <tr>
                                            <td style="font-family: Arial, Helvetica, sans-serif; font-size: 10pt; font-weight: bold; color: #535353; text-align: right; padding-right: 10px; height: 30px" width="150px">
                                                *Contact Number:</td>
                                            <td width="275px">
                                               <asp:TextBox ID="TextBox5" runat="server" Width="250px"></asp:TextBox> </td>
                                            <td style="font-family: Arial, Helvetica, sans-serif; font-size: 10pt; color: #FF0000; padding-left: 10px; text-align: left" width="150px">
                                                 </td>
                                        </tr>
                                        <tr>
                                            <td style="font-family: Arial, Helvetica, sans-serif; font-size: 10pt; font-weight: bold; color: #535353; text-align: right; padding-right: 10px; height: 30px" width="150px">
                                                *City:</td>
                                            <td width="275px">
                                                <asp:TextBox ID="TextBox6" runat="server" Width="250px"></asp:TextBox></td>
                                            <td style="font-family: Arial, Helvetica, sans-serif; font-size: 10pt; color: #FF0000; padding-left: 10px; text-align: left" width="150px">
                                                 </td>
                                        </tr>
                                        <tr>
                                            <td style="font-family: Arial, Helvetica, sans-serif; font-size: 10pt; font-weight: bold; color: #535353; text-align: right; padding-right: 10px; height: 30px" width="150px">
                                                Your CV:</td>
                                            <td width="275px">
                                                <asp:UpdatePanel ID="UpdatePanel1" runat="server">
                                                    <ContentTemplate>
                                                        <asp:FileUpload ID="FileField" runat="server" Width="247px" /><br />
                                                        <asp:Button ID="Button2" runat="server" Text="Upload" Height="20px" 
                                                            onclick="Button2_Click" /><asp:Image ID="Image2" runat="server" Visible="False" />
                                                        <asp:Label ID="Label2" runat="server" Font-Names="Arial" Font-Size="10pt" 
                                                            ForeColor="#535353" Text="File Uploaded Successfully" Visible="False"></asp:Label>
                                                    </ContentTemplate>
                                                </asp:UpdatePanel>
                                                
                                            </td>
                                            <td style="font-family: Arial, Helvetica, sans-serif; font-size: 10pt; color: #FF0000; padding-left: 10px; text-align: left" width="150px">
                                                </td>
                                        </tr>
                                        <tr>
                                            <td style="font-family: Arial, Helvetica, sans-serif; font-size: 10pt; font-weight: bold; color: #535353; text-align: right; padding-right: 10px; height: 30px" 
                                                width="150px" valign="top">
                                                Describe Yourself:                              <td width="275px">
                                                <asp:TextBox ID="TextBox8" runat="server" Width="250px" Height="200px"></asp:TextBox></td>
                                            <td style="font-family: Arial, Helvetica, sans-serif; font-size: 10pt; color: #FF0000; padding-left: 10px; text-align: left" 
                                                width="150px" valign="top">
                                                 </td>
                                        </tr>
                                        <tr>
                                            <td style="font-family: Arial, Helvetica, sans-serif; font-size: 10pt; font-weight: bold; color: #535353; text-align: right; padding-right: 10px; height: 30px" width="150px">
                                                </td>
                                            <td width="275px">
                                                <asp:Button ID="Button1" runat="server" Text="Apply" 
                                                    onclick="Button1_Click" />
                                                </td>
                                            <td style="font-family: Arial, Helvetica, sans-serif; font-size: 10pt; color: #FF0000; padding-left: 10px; text-align: left" width="150px">
                                                </td>
                                        </tr>
                                        <tr>
                                            <td style="font-family: Arial, Helvetica, sans-serif; font-size: 10pt; font-weight: bold; color: #535353; text-align: left; height: 30px; padding-left: 10px;" 
                                                colspan="3">
                                                <asp:Label ID="Label1" runat="server" ForeColor="#009999" 
                                                    Text="* Your Resume Send Successfully." Visible="False"></asp:Label>
                                                </td>
                                        </tr>
                                    </table>

Thanks in Advance

shahid.majeed:

 <asp:UpdatePanel ID="UpdatePanel1" runat="server">  

                                                    <ContentTemplate>  

                                                        <asp:FileUpload ID="FileField" runat="server" Width="247px" /><br />  

                                                        <asp:Button ID="Button2" runat="server" Text="Upload" Height="20px"   

                                                            onclick="Button2_Click" /><asp:Image ID="Image2" runat="server" Visible="False" />  

                                                        <asp:Label ID="Label2" runat="server" Font-Names="Arial" Font-Size="10pt"   

                                                            ForeColor="#535353" Text="File Uploaded Successfully" Visible="False"></asp:Label>  

                                                    </ContentTemplate>  

                                                </asp:UpdatePanel>  

File upload control would not work with update panel (known issue)... to make it work you need to have a button with registered as asynchrinous postback..

check out some reference thread > UpdatePanel and FileUpload - ASP.NET Forums

Fileupload inside updatepanel problems - ASP.NET Forums

File Upload Control is not working in Update Panel - ASP.NET Forums

hope it helps./.

Skip using the PostedFile property and just use SaveAs. Once the file has been uploaded (using SaveAs) you can use the PostedFile property.

 Refer here for how to use Fileuplaod in update panel

http://www.aspsnippets.com/post/2009/05/05/Using-FileUpload-Control-inside-ASPNet-AJAX-UpdatePanel-Control.aspx

Do this:

<asp:UpdatePanel runat="server">

            <ContentTemplate>              

                <asp:FileUpload runat="server" />

                <asp:Button runat="server" Text="Upload" />

            </ContentTemplate>

            <Triggers>

                <asp:PostBackTrigger ControlID="btnUpload" />               

            </Triggers>

        </asp:UpdatePanel>

 protected void btnUpload_Click(object sender, EventArgs e)

    {

        string filename = System.IO.Path.GetFileName(fuUpload.FileName);

        fuUpload.SaveAs("C:\temp" + filename);

    }

Here is good discussion on file upload in AJAX Update Panel.

http://forums.asp.net/p/1105208/1689084.aspx

i do with the triger, its upload the file at destination. now i want to rename the user file before uploading. because my be some one already save the file with the same file name. so please let me know how i can do this.

Thanks

 Refer here

http://msdn.microsoft.com/en-us/library/aa479405.aspx

shahid.majeed:

because my be some one already save the file with the same file name.

There are possible 2 alternatives.. whenever you upload a file:

[1] just check whether file exists or not in the folder where you want to save the file. IF it exists then simply delete it first before saving the file:

        if (System.IO.File.Exists(Server.MapPath("~/images/test.jpg")))
            System.IO.File.Delete(Server.MapPath("~/images/test.jpg"));
        FileUpload1.PostedFile.SaveAs(Server.MapPath("~/images/test.jpg"));

OR

[2] save the file with some other name (renaming the file with some other name as you want to do)

you can save the file with any/proper file naming convension with PostedFile.SaveAs() method as:

        FileUpload1.PostedFile.SaveAs(Server.MapPath("~/images/test.jpg"));

hope it helps./.

when i am going to rename the file name,  but its not uploading the file. even did not give me any error. please let me know what is the problem in my code.

Here is my Code

protected void Button2_Click(object sender, EventArgs e)
    {
       //find upload directory
        string UpPath;
        UpPath = Server.MapPath("CV");
        
        // Renaming the file name
        string strFileName;
        strFileName = FileField.PostedFile.FileName;
        string c = System.IO.Path.GetFileName(strFileName);
        c = this.Session["JobNo"].ToString()+ c; 
        
        //Uploading the CV
        try
        {
            Image2.Visible = true;
            FileField.PostedFile.SaveAs(UpPath + c);
            Image2.Visible = false;
            Label2.Visible = true;
        }
        catch (Exception exp)
        {
            Label2.Text = exp.Message.ToString();
            Label2.Visible = true;
        }
    }

Page Code

<table cellpadding="0" cellspacing="0" class="style8">
                                        <tr>
                                            <td style="font-family: Arial, Helvetica, sans-serif; font-size: 10pt; font-weight: bold; color: #535353; text-align: right; padding-right: 10px; height: 30px" width="150px">
                                                *Name:</td>
                                            <td width="275px">
                                                <asp:TextBox ID="TextBox2" runat="server" Width="250px"></asp:TextBox>
                                                </td>
                                            <td style="font-family: Arial, Helvetica, sans-serif; font-size: 10pt; color: #FF0000; padding-left: 10px; text-align: left" width="150px">
                                                 </td>
                                        </tr>
                                        <tr>
                                           <td style="font-family: Arial, Helvetica, sans-serif; font-size: 10pt; font-weight: bold; color: #535353; text-align: right; padding-right: 10px; height: 30px" width="150px">
                                                *Email Address:</td>
                                            <td width="275px">
                                                <asp:TextBox ID="TextBox4" runat="server" Width="250px"></asp:TextBox>
                                                </td>
                                            <td style="font-family: Arial, Helvetica, sans-serif; font-size: 10pt; color: #FF0000; padding-left: 10px; text-align: left" width="150px">
                                                 </td>
                                        </tr>
                                        <tr>
                                            <td style="font-family: Arial, Helvetica, sans-serif; font-size: 10pt; font-weight: bold; color: #535353; text-align: right; padding-right: 10px; height: 30px" width="150px">
                                                *Contact Number:</td>
                                            <td width="275px">
                                               <asp:TextBox ID="TextBox5" runat="server" Width="250px"></asp:TextBox> </td>
                                            <td style="font-family: Arial, Helvetica, sans-serif; font-size: 10pt; color: #FF0000; padding-left: 10px; text-align: left" width="150px">
                                                 </td>
                                        </tr>
                                        <tr>
                                            <td style="font-family: Arial, Helvetica, sans-serif; font-size: 10pt; font-weight: bold; color: #535353; text-align: right; padding-right: 10px; height: 30px" width="150px">
                                                *City:</td>
                                            <td width="275px">
                                                <asp:TextBox ID="TextBox6" runat="server" Width="250px"></asp:TextBox></td>
                                            <td style="font-family: Arial, Helvetica, sans-serif; font-size: 10pt; color: #FF0000; padding-left: 10px; text-align: left" width="150px">
                                                 </td>
                                        </tr>
                                        <tr>
                                            <td style="font-family: Arial, Helvetica, sans-serif; font-size: 10pt; font-weight: bold; color: #535353; text-align: right; padding-right: 10px; height: 30px" width="150px">
                                                Your CV:</td>
                                            <td width="275px">
                                                <asp:UpdatePanel ID="UpdatePanel1" runat="server">
                                                    <ContentTemplate>
                                                        <asp:FileUpload ID="FileField" runat="server" Width="247px" /><br />
                                                        <asp:Button ID="Button2" runat="server" Text="Upload" Height="20px" 
                                                            onclick="Button2_Click" /><asp:Image ID="Image2" runat="server" Visible="False" />
                                                        <asp:Label ID="Label2" runat="server" Font-Names="Arial" Font-Size="10pt" 
                                                            ForeColor="#535353" Text="File Uploaded Successfully" Visible="False"></asp:Label>
                                                    </ContentTemplate>
                                                    <Triggers>
                                                        
                                                        <asp:PostBackTrigger ControlID = "Button2" />
                                                    </Triggers>
                                                </asp:UpdatePanel>
                                                
                                            </td>
                                            <td style="font-family: Arial, Helvetica, sans-serif; font-size: 10pt; color: #FF0000; padding-left: 10px; text-align: left" width="150px">
                                                </td>
                                        </tr>
                                        <tr>
                                            <td style="font-family: Arial, Helvetica, sans-serif; font-size: 10pt; font-weight: bold; color: #535353; text-align: right; padding-right: 10px; height: 30px" 
                                                width="150px" valign="top">
                                                Describe Yourself:                              <td width="275px">
                                                <asp:TextBox ID="TextBox8" runat="server" Width="250px" Height="200px"></asp:TextBox></td>
                                            <td style="font-family: Arial, Helvetica, sans-serif; font-size: 10pt; color: #FF0000; padding-left: 10px; text-align: left" 
                                                width="150px" valign="top">
                                                 </td>
                                        </tr>
                                        <tr>
                                            <td style="font-family: Arial, Helvetica, sans-serif; font-size: 10pt; font-weight: bold; color: #535353; text-align: right; padding-right: 10px; height: 30px" width="150px">
                                                </td>
                                            <td width="275px">
                                                <asp:Button ID="Button1" runat="server" Text="Apply" 
                                                    onclick="Button1_Click" />
                                                </td>
                                            <td style="font-family: Arial, Helvetica, sans-serif; font-size: 10pt; color: #FF0000; padding-left: 10px; text-align: left" width="150px">
                                                </td>
                                        </tr>
                                        <tr>
                                            <td style="font-family: Arial, Helvetica, sans-serif; font-size: 10pt; font-weight: bold; color: #535353; text-align: left; height: 30px; padding-left: 10px;" 
                                                colspan="3">
                                                <asp:Label ID="Label1" runat="server" ForeColor="#009999" 
                                                    Text="* Your Resume Send Successfully." Visible="False"></asp:Label>
                                                </td>
                                        </tr>
                                    </table>

shahid.majeed:

 FileField.PostedFile.SaveAs(UpPath + c);  

just a small mistake..

you need to combine the path as..

FileField.PostedFile.SaveAs(System.IO.Path.Combine(UpPath, c));

hope it helps./.

i have some doudth in my mind. i am renaming the file. for example file name is abc.doc and i rename it with the code 1011abc.doc , butt at client computer file name remain abc.doc. when fileupload control try to upload the file with 1011abc.doc it did not find on the client computer. 

Thanks.

shahid.majeed:

i have some doudth in my mind. i am renaming the file. for example file name is abc.doc and i rename it with the code 1011abc.doc , butt at client computer file name remain abc.doc. when fileupload control try to upload the file with 1011abc.doc it did not find on the client computer. 

try out yourself... it should work.. SaveAs() method will save the object that resides as FileUpload.PostedFile with given name..

jst use this script:

<script language="VB" runat="server">

Sub Upload(Source As Object, e As EventArgs)

   If Not (myFile.PostedFile Is Nothing) Then

      Dim intFileNameLength as Integer
      Dim strFileNamePath as String
      Dim strFileNameOnly as String

      'Logic to find the FileName (excluding the path)
      strFileNamePath = MyFile.PostedFile.FileName
      intFileNameLength = Instr(1, StrReverse(strFileNamePath), "\")
      strFileNameOnly = Mid(strFileNamePath, (Len(strFileNamePath)-intFileNameLength)+2)

            'myFile.PostedFile.SaveAs("c:\inetpub\wwwroot\yourwebapp\upload\" & strFileNameOnly)
            myFile.PostedFile.SaveAs("d:\" & strFileNameOnly)
      lblMsg.Text = "File Upload Success."

   End If
End Sub
</script>

and call this script on button click and ur problem is solved

if ur problem is solved marked as answer plz

Regard

Prateek

Not sure what the problem is. You are uploading a file from the client and saving it to your server. You can choose to rename the filename and save it to any folder as long as the user running the web app has write access to the directory.

yes i upload file from client side and save that file into server side

if that not solve your  requirement then send reply again what is ur need ?

i m try my best to solve your problem

Regard

Prateek