I am getting the following ERROR in my WebApp on line 30:
Server Error in '/TestWebApp' Application.
--------------------------------------------------------------------------------
Object reference not set to an instance of an object.
Description: An unhandled exception occurred during the execution of the
current web request. Please review the stack trace for more information about
the error and where it originated in the code.
Exception Details: System.NullRefe renceException: Object reference not set
to an instance of an object.
Source Error:
Line 28: public void Upload_click(ob ject sender, System.EventArg s e)
Line 29: {
Line 30: if (uploadFile.Pos tedFile != null)
Line 31: {
Line 32: string test = uploadFile.Post edFile.FileName ;
Source File: c:\documents and settings\my
documents\mypro jects\web\proje ct\testwebapp\t est.aspx.cs Line: 30
Stack Trace:
[NullReferenceEx ception: Object reference not set to an instance of an
object.]
TestWebApp.test .Upload_click(O bject sender, EventArgs e) in c:\documents
and settings\my documents\mypro jects\web\proje ct\testwebapp\t est.aspx.cs:30
System.Web.UI.W ebControls.Butt on.OnClick(Even tArgs e)
System.Web.UI.W ebControls.Butt on.System.Web.U I.IPostBackEven tHandler.RaiseP ostBackEvent(St ring eventArgument)
System.Web.UI.P age.RaisePostBa ckEvent(IPostBa ckEventHandler
sourceControl, String eventArgument)
System.Web.UI.P age.RaisePostBa ckEvent(NameVal ueCollection postData)
System.Web.UI.P age.ProcessRequ estMain()
I thought I was doing something wrong in my WebApp, so I created a brand new
solution to test with I get the same error. Below is all the code for my
test. Basically, all this webpage has is a HTML File Field Control, and a
Web Forms Button Control on it. After you click the File Field and select
your file, then you click the Button which calls Upload_click. When it reads
if (uploadFile.Pos tedFile != null) is when I get the error.
I'm new with ASP.net and this seems pretty straight-forward, but I can't
seem to see what I am doing wrong. Can someone tell me what I am doing wrong?
using System;
using System.Collecti ons;
using System.Componen tModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.Sess ionState;
using System.Web.UI;
using System.Web.UI.W ebControls;
using System.Web.UI.H tmlControls;
namespace TestWebApp
{
/// <summary>
/// Summary description for test.
/// </summary>
public class test : System.Web.UI.P age
{
protected System.Web.UI.W ebControls.Butt on Upload;
protected System.Web.UI.H tmlControls.Htm lInputFile uploadFile;
private void Page_Load(objec t sender, System.EventArg s e)
{
// Put user code to initialize the page here
}
public void Upload_click(ob ject sender, System.EventArg s e)
{
if (uploadFile.Pos tedFile != null)
{
string test = uploadFile.Post edFile.FileName ;
}
}
#region Web Form Designer generated code
override protected void OnInit(EventArg s e)
{
//
// CODEGEN: This call is required by the ASP.NET Web Form Designer.
//
InitializeCompo nent();
base.OnInit(e);
}
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeCompo nent()
{
this.Load += new System.EventHan dler(this.Page_ Load);
}
#endregion
}
}
<%@ Page language="c#" Codebehind="tes t.aspx.cs" AutoEventWireup ="false"
Inherits="TestW ebApp.test" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
<HEAD>
<title>test</title>
<meta name="GENERATOR " Content="Micros oft Visual Studio .NET 7.1">
<meta name="CODE_LANG UAGE" Content="C#">
<meta name="vs_defaul tClientScript" content="JavaSc ript">
<meta name="vs_target Schema"
content="http://schemas.microso ft.com/intellisense/ie5">
</HEAD>
<body>
<form id="Form1" method="post" runat="server">
<INPUT id="uploadFile " type="file">
<asp:Button id="Upload" OnClick="Upload _click" runat="server"
Text="Upload"></asp:Button>
</form>
</body>
</HTML>
Thanks,
