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Error Message

P: n/a
I get this error if an item in a radiobutton list is not chosen when filling
in a form..

I added a RequiredFieldValidator, but I still get the message.
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.NullReferenceException: Object reference not set
to an instance of an object.
May 25 '07 #1
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4 Replies


P: n/a
Hello dancer,

Do u know the line number where the error was arised? (should be in the stack
trace details)
It would be more usefull if you provide the code where is exection thrown

---
WBR, Michael Nemtsev [.NET/C# MVP].
My blog: http://spaces.live.com/laflour
Team blog: http://devkids.blogspot.com/

"The greatest danger for most of us is not that our aim is too high and we
miss it, but that it is too low and we reach it" (c) Michelangelo

dI get this error if an item in a radiobutton list is not chosen when
dfilling in a form..
d>
dI added a RequiredFieldValidator, but I still get the message.
dObject reference not set to an instance of an object.
dDescription: An unhandled exception occurred during the execution of
dthe
dcurrent web request. Please review the stack trace for more
dinformation
dabout the error and where it originated in the code.
dException Details: System.NullReferenceException: Object reference
dnot set to an instance of an object.
d>
May 25 '07 #2

P: n/a

Is this helpful?
Stack Trace:

[NullReferenceException: Object reference not set to an instance of an
object.]
ASP.juan_radio30_aspx.btnSendMail_OnClick(Object Source, EventArgs E)
+453
System.Web.UI.WebControls.Button.OnClick(EventArgs e) +105
System.Web.UI.WebControls.Button.RaisePostBackEven t(String eventArgument)
+107
System.Web.UI.WebControls.Button.System.Web.UI.IPo stBackEventHandler.RaisePostBackEvent(String
eventArgument) +7
System.Web.UI.Page.RaisePostBackEvent(IPostBackEve ntHandler
sourceControl, String eventArgument) +11
System.Web.UI.Page.RaisePostBackEvent(NameValueCol lection postData) +33
System.Web.UI.Page.ProcessRequestMain(Boolean
includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +5102

Here is my code:

<%@ Page Language="VB" ClientTarget="downlevel" %>

<%@ Import Namespace="System.Web.Mail" %>

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

Sub btnSendMail_OnClick(Source As Object, E As EventArgs)
Dim TheLocation As String = Location.Text

Dim TheDate As String = DateofAccident.Text

Dim TheWho As String = Who.Text

Dim Empornon As String

Dim TheCheckemp As String = checkemp.Text

Dim TheChecknon As String = Checknon.Text

Dim TheCheckpremisesyes As String = checkpremisesyes.Text

Dim TheCheckpremisesno As String = Checkpremisesno.Text

Dim Premises As String

Dim TheCheckJobsiteYes As String = checkjobsiteyes.text

Dim ThecheckJobsiteNo As String = checkjobsiteno.text

Dim Jobsite As String

Dim TheTimeAM As String = am.Text

Dim TheTimePM As String = pm.Text

Dim TheTime As String

Dim TheHireDate As String = Hiredate.Text

Dim TheJobTitle As String = occupation.Text

Dim Tenure As String = lengthofjob.Text

Dim TheOperation As String = operation.Text

Dim TheOperationNew As String

Dim TheHow As String = how.text

Dim TheHowNew As String

Dim TheNature As String = nature.Text

Dim TheNatureNew As String

Dim TheIndicate As String = Indicate.Text

Dim TheAction As String = action.Text

Dim TheActionNew As String

Dim Training As String = EmpTrain.SelectedItem.Text

Dim TheCaution as string=EmpCaution.SelectedItem.Text

Dim TheReport as String = EmpReport.SelectedItem.Text

Dim TheModifiedDuty As String = ModifiedDuty.SelectedItem.Text

Dim TheSubmitter As String = Submitter.Text

Dim TheToday As String = Today.Text

Dim myMessage As New MailMessage

Dim myMail As SmtpMail

Dim strEmail As String

Dim UserMessage As String

Dim TheGetOther As String = GetOther.Text
If Checkemp.Checked Then

Empornon = "Employee"

ElseIf Checknon.checked Then

empornon= "Non-Employee"

Else Empornon = ""

Writeline(empornon)

End If
If Checkpremisesyes.Checked Then

Premises = "Yes"

ElseIf Checkpremisesno.Checked Then

Premises = "No"

Else Premises = ""

End If

If CheckJobSiteYes.Checked Then

Jobsite = "Yes"

ElseIf CheckJobsiteNo.checked Then

Jobsite = "No"

Else Jobsite = ""

End If

If TheTimeAm <"" Then

TheTime = TheTimeAm & " AM"

ElseIf TheTimePM <"" Then

TheTime = TheTimePM & " PM"

Else TheTime = ""

End If

TheActionNew = TheAction.Replace(vbCrLf,"<br />")

TheNatureNew = TheNature.Replace(vbCrLf,"<br />")

TheHowNew = TheHow.Replace(vbCrLf,"<br />")

TheOperationNew = TheOperation.Replace(vbCrLf,"<br />")
Dim s As String

Dim i As Int32

For i = 0 to Indicate.Items.Count-1

If Indicate.Items(i).Selected Then

s= s & Indicate.Items(i).Text & "<br>"

End If

Next

If TheGetOther <"" Then

TheGetOther = "Other: " & TheGetOther

End If
If Page.IsValid() Then

'strEmail = txtEmail.Text

'Location = Location.Text

myMessage.From = "xx********@xxxxxxxxx.com"

' myMessage.To = strEmail

MyMessage.To = "xx**********@xxxxxxxxxx.com"

myMessage.Subject = "Accident Form (HTML)"

' This is the magic line. Without this the message will just appear

' as plain HTML and won't be rendered by the recipient's email client.

' It'd be as if they did "View Source" on a web page.

MyMessage.BodyFormat = MailFormat.Html

myMessage.Body = "<h2>Wheeler's Accident Investigation Form</h2>" & vbCrLf _

& " <p>" & vbCrLf _

& "<html><body<table width = ""750"" bgcolor=""#E9EDF4"" height=""25""
border=""1"" cellpadding=""3"" fontface=""Verdana"" Size=""2"">" & vbCrLf _

& "<tdLocation where accident occurred: " & "<br>" & Thelocation & "<br>"
& "</td>" & vbCrLf _

& "<tdEmployer's Premises? " & premises & "<br>" & vbCrLf _

& " Job Site? " & Jobsite & "<br>" & "</td>" & vbCrLf _

& "<tdDate of accident: " & TheDate & "<br>" & "</td>" & vbCrLf _

& "<tr><tdWho was injured: " & Thewho & "<br>" & "</td>" & vbCrLf _

& "<tdEmployee or non-employee?" & "<br>" & empornon & "<br>" & "</td>" &
vbCrLf _

& "<tdTime of accident: " & TheTime & "<br>" & "</td>" & "</tr>" & vbCrLf
_

& "<tdDate of Hire: " & TheHireDate & "<br>" & "</td>" & vbCrLf _

& "<tdJob Title: " & TheJobTitle & "<br>" & "</td>" & vbCrLf _

& "<tdHow long has employee worked at job where injury occurred? " &
Tenure & "<br>" & "</td>" & "</tr>" & vbCrLf _

& "<tr<td colspan=""3""What was employee doing when injury occurred? " &
TheOperation & "<br>" & "</td></tr>" & vbCrLf _

& "<tr<td colspan=""3""How did the injury occur? " & TheHowNew & "<br>"
& "</td></tr>" & vbCrLf _

& "<tr<td colspan=""3""Nature and extent injury and property damaged: "
& TheNatureNew & "<br>" & "</td></tr>" & vbCrLf _

& "<tr<td colspan=""3""PLEASE INDICATE ALL WHICH CONTRIBUTED TO THE
INJURY: " & "<BR>" & S & "</TD></TR>" & vbCrLf _

& "<tr<td colspan=""3""" & TheGetOther & "</td></tr>" & vbCrLf _

& "<tr<td colspan=""3""Supervisor's corrective action to ensure this
type of accident does not recur: " & TheActionNew & "<br>" & vbCrLf _

& "<tr<td colspan=""3""Was employee trained in the appropriate use of
Personal Protective Equipment/Proper safety procedures? " & Training &
vbCrLf _

& "<br>" & "</td></tr>" & vbCrLf _

& "<tr><td colspan=""3""Was employee cautioned for failure to use Personal
Protective Equipment/Proper safety procedures? " & TheCaution &"</tr></td>"
& vbCrLf _

& "<tr<tdDid employee promptly report the injury? " & TheReport &
"</td>" & vbCrLf _

& "<tdIs there modified duty available? " & TheModifiedduty & "</td></tr>"
& vbCrLf _

& "<tr<tdPerson submitting this form: " & "<br>" & theSubmitter &
"</td>" & vbCrLf _

& "<tdDate: " & Thetoday & vbCrLf _

& "</td><tr></table</body>"

' Doesn't have to be local... just enter your

' SMTP server's name or ip address!

myMail.SmtpServer = ""

myMail.Send(myMessage)

frmEmail.Visible = False

UserMessage = "Has Been Sent."

'lblUserMessage.Text = "Place of accident " & Thelocation

End If

End Sub

</script>

<html>

<head>

<title>ASP.NET Email (HTML Format) Sample</title>

</head>

<body>
<table width="750" bgcolor="#E9EDF4" table border="1" cellpadding="3">

<h3><center><font face="Verdana">Wheeler's Accident Investigation
Form</font></center></h3>

<form method="post" id="frmEmail" runat="server">

<%--asp:TextBox id="txtEmail" size="30" runat="server" /--%>
<%--asp:RegularExpressionValidator runat="server"

id="validEmailRegExp" ControlToValidate="txtEmail"

ValidationExpression="^[\w-]+(\.[\w-]+)*@(?:[\w-]+\.)+[a-zA-Z]{2,7}$"

errormessage="Please enter a valid email address."

Display="Dynamic" /--%>


<%--__________________________________________________ __________________________--%>

<%--ROW 1--%>
<td width="245" valign="top">
<font face="Verdana" Size="2">

Location where accident occurred: <asp:textbox id="Location" runat=server
columns="25"/>

<asp:RequiredFieldValidator

ControlToValidate="Location"

Text="The location field is required"

runat="server"/>

</td>

<td align="right" valign="top" width="225">
<font face="Verdana" Size="2">Employer's Premises

<asp:CheckBox id=Checkpremisesyes Text="yes" runat="server" />

<asp:CheckBox id=Checkpremisesno Text="no" runat="server" />

<br>
Job site

<asp:CheckBox id=Checkjobsiteyes Text="yes" runat="server" />

<asp:CheckBox id=Checkjobsiteno Text="no" runat="server" />
</td>

<td>

<font face="Verdana" Size="2">Date of accident</font><br>

<asp:textbox id="DateofAccident" runat=server Width="100"/>
</td>

<%--__________________________________________________ __________________________--%>

<%--ROW 2--%>
<tr<td>

<font face="Verdana" Size="2">Who was injured?</font><br>

<asp:textbox id="Who" runat=server columns="25"/>

</td>

<td align= "left">

<font face="Verdana" Size="2">Employee <asp:CheckBox id=Checkemp
runat="server" />

<br>

Non-employee <asp:CheckBox id="Checknon" runat="server" />
</td>

<td align="right"><font face="Verdana" Size="2">

Time of accident a.m. <asp:textbox columns="6" id="am" runat=server />

<brp.m. <asp:textbox id="pm" runat=server columns="6"/>

</TD>

<%--__________________________________________________ __________________________--%>

<%--ROW 3--%>

<tr>

<td>

<font face="Verdana" Size="2">Date of Hire <br<asp:textbox id="Hiredate"
runat=server/>

</td>

<td>

<font face="Verdana" Size="2">Job Title or Occupation <br><asp:textbox
id="occupation" runat=server columns="25"/>

</td>

<td<font face="Verdana" Size="2">How long has employee worked at job where
injury occurred?<br><asp:textbox id="lengthofjob" runat=server/>

</td>

</Table>

<%--__________________________________________________ __________________________--%>

<%--Row 4--%>

<table width="750" bgcolor="#E9EDF4" table border="1" cellpadding="3">

<tr>

<td>

<p>

<font face="Verdana" Size="2">What was employee doing when injury occurred?

What machine or tool was being used? What type of operation?<br>

<asp:textbox TextMode= "Multiline" Rows= "5" columns= "80"

id="operation" runat=server width="730" height="40"/>

</td>

</tr>

<%--__________________________________________________ __________________________--%>

<%--Row 5--%>

<td<font face="Verdana" Size="2">How did injury occur? List all objects
and substances involved.<br>

<asp:textbox TextMode="MultiLine" Rows="5" columns= "80" id="How"
runat=server/>

</td>

</tr>

<%--__________________________________________________ __________________________--%>

<%--Row 6--%>

<tr>

<td><font face="Verdana" Size="2"Nature and extent of injury and property
damaged (be specific)

<asp:textbox TextMode="MultiLine" Rows="2" columns= "80" id="nature"
runat=server/>

</td>

</tr>

<%--__________________________________________________ __________________________--%>

<%--Row 7--%>

<tr>

<td><font face="Verdana" Size="2" type = "strong"PLEASE INDICATE ALL OF
THE FOLLOWING WHICH CONTRIBUTED TO THE INJURY:

<asp:CheckBoxList id=Indicate runat="server">

<asp:ListItem style<font face="Verdana" Size="2">Improper
instruction</asp:ListItem>

<asp:ListItem<font face="Verdana" Size="2">Lack of training or
skill</asp:ListItem>

<asp:ListItem<font face="Verdana" Size="2">Operating without
authority</asp:ListItem>

<asp:ListItem<font face="Verdana" Size="2">Horseplay</asp:ListItem>

<asp:ListItem<font face="Verdana" Size="2">Physical or mental
impairment</asp:ListItem>

<asp:ListItem<font face="Verdana" Size="2">Failure to
secure</asp:ListItem>

<asp:ListItem style<font face="Verdana" Size="2">Failure to
lockout</asp:ListItem>

<asp:ListItem<font face="Verdana" Size="2">Unsafe position</asp:ListItem>

<asp:ListItem<font face="Verdana" Size="2">Improper dress</asp:ListItem>

<asp:ListItem<font face="Verdana" Size="2">Improper protective
equipment</asp:ListItem>

<asp:ListItem<font face="Verdana" Size="2">Unsafe equipment</asp:ListItem>

<asp:ListItem<font face="Verdana" Size="2">Poor
housekeeping</asp:ListItem>

<asp:ListItem<font face="Verdana" Size="2">Unsafe arrangement or
process</asp:ListItem>

<asp:ListItem<font face="Verdana" Size="2">Poor ventilation</asp:ListItem>

<asp:ListItem<font face="Verdana" Size="2">Improper
guarding</asp:ListItem>

<asp:ListItem<font face="Verdana" Size="2">Improper
maintenance</asp:ListItem>

<asp:ListItem<font face="Verdana" Size="2">Inoperative safety
device</asp:ListItem>
</asp:CheckBoxListOther <asp:TextBox columns = "50" id="GetOther"
runat=server/>

</td>

</tr>

<%--__________________________________________________ __________________________--%>

<%--Row 8--%>

<tr>

<td colspan= "3"><font face="Verdana" Size="2"Supervisor's corrective
action to ensure this type of accident does not recur:

<asp:TextBox TextMode="MultiLine" Rows="5" columns= "80" id=action
runat="server"/>

<br>

</tr>

</td>

<%--__________________________________________________ __________________________--%>

<%--Row 9--%>

<tr>

<td<font face="Verdana" Size="2">Was employee trained in the appropriate
use of Personal Protective Equipment/Proper safety procedures?

<br>

<asp:RadioButtonList font-name="verdana" font-size="10 pt" id=EmpTrain
runat="server">

<asp:ListItem>Yes</asp:ListItem>

<asp:ListItem>No</asp:ListItem>

</asp:RadioButtonList>

<asp:RequiredFieldValidator

ControlToValidate="EmpTrain"

InitialValue=""

Text="You need to select yes or no"

runat="server"/>

</td>

</tr>

<%--__________________________________________________ __________________________--%>

<%--Row 10--%>

<tr>

<td<font face="Verdana" Size="2">

Was employee cautioned for failure to use Personal Protective
Equipment/Proper safety procedures? <br>

<asp:RadioButtonList font-name="verdana" font-size="10 pt" id=EmpCaution
runat="server">

<asp:ListItem>Yes</asp:ListItem>

<asp:ListItem>No</asp:ListItem>

</asp:RadioButtonList>
</td>

</tr>

<%--__________________________________________________ __________________________--%>

<%--Row 11--%>

<tr>

<td<font face="Verdana" Size="2">

Did employee promptly report the injury?

<asp:RadioButtonList font-name="verdana" font-size="10 pt" id=EmpReport
runat="server">

<asp:ListItem>Yes</asp:ListItem>

<asp:ListItem>No</asp:ListItem>

</asp:RadioButtonList>
</td>

</tr>

<%--__________________________________________________ __________________________--%>

<%--Row 12--%>

<tr>

<td<font face="Verdana" Size="2">Is there modified duty available?

<asp:RadioButtonList font-name="verdana" font-size="10 pt" id=ModifiedDuty
runat="server">

<asp:ListItem>Yes</asp:ListItem>

<asp:ListItem>No</asp:ListItem>

</asp:RadioButtonList>
</td>

</tr>

<%--__________________________________________________ __________________________--%>

<%--Row 12--%>

</table>

<table width="750" bgcolor="#E9EDF4" table border="1" cellpadding="3">

<td width="400"><font face="Verdana" Size="2"Name of person submitting
this form:

<asp:textbox id="Submitter" runat=server columns="40"/</td>
<td<font face="Verdana" Size="2">Today's Date: <asp:textbox id="Today"
runat=server columns="10"/>

</td>

</tr>

<tr>

<td>

<asp:Button id="btnSendMail" text="Submit" OnClick="btnSendMail_OnClick"
runat="server" />

</td>

</tr>

<asp:ValidationSummary

HeaderText="You must enter a value in the following fields:"

DisplayMode="BulletList"

EnableClientScript="true"

ShowMessageBox = "true"

runat="server"/>

</form>

</body>

</html>
"Michael Nemtsev" <ne*****@msn.comwrote in message
news:a2***************************@msnews.microsof t.com...
Hello dancer,

Do u know the line number where the error was arised? (should be in the
stack trace details)
It would be more usefull if you provide the code where is exection thrown

---
WBR, Michael Nemtsev [.NET/C# MVP]. My blog:
http://spaces.live.com/laflour
Team blog: http://devkids.blogspot.com/

"The greatest danger for most of us is not that our aim is too high and we
miss it, but that it is too low and we reach it" (c) Michelangelo

dI get this error if an item in a radiobutton list is not chosen when
dfilling in a form..
ddI added a RequiredFieldValidator, but I still get the message.
dObject reference not set to an instance of an object.
dDescription: An unhandled exception occurred during the execution of
dthe
dcurrent web request. Please review the stack trace for more
dinformation
dabout the error and where it originated in the code.
dException Details: System.NullReferenceException: Object reference
dnot set to an instance of an object.
d>

May 25 '07 #3

P: n/a
On May 25, 11:08 pm, "dancer" <dan...@microsoft.comwrote:
Is this helpful?
Stack Trace:

[NullReferenceException: Object reference not set to an instance of an
object.]
I think, you forgot to add a RequiredFieldValidator for the EmpCaution
list

May 27 '07 #4

P: n/a
On May 27, 4:23 pm, Alexey Smirnov <alexey.smir...@gmail.comwrote:
On May 25, 11:08 pm, "dancer" <dan...@microsoft.comwrote:
Is this helpful?
Stack Trace:
[NullReferenceException: Object reference not set to an instance of an
object.]

I think, you forgot to add a RequiredFieldValidator for the EmpCaution
list
Okay, the problem is in the very first line of your page

<%@ Page Language="VB" ClientTarget="downlevel" %>

Get rid of the ClientTarget and validation will work.

May 27 '07 #5

This discussion thread is closed

Replies have been disabled for this discussion.