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dancer

unread,

May 25, 2007, 1:36:06 PM5/25/07

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.

Michael Nemtsev

unread,

May 25, 2007, 2:29:08 PM5/25/07

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

d> I get this error if an item in a radiobutton list is not chosen when
d> filling in a form..
d>
d> I added a RequiredFieldValidator, but I still get the message.
d> Object reference not set to an instance of an object.
d> Description: An unhandled exception occurred during the execution of
d> the
d> current web request. Please review the stack trace for more
d> information
d> about the error and where it originated in the code.
d> Exception Details: System.NullReferenceException: Object reference
d> not set to an instance of an object.
d>

dancer

unread,

May 25, 2007, 5:08:00 PM5/25/07

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.RaisePostBackEvent(String eventArgument)
+107
System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String
eventArgument) +7
System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler
sourceControl, String eventArgument) +11
System.Web.UI.Page.RaisePostBackEvent(NameValueCollection 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" %>

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," ")

TheNatureNew = TheNature.Replace(vbCrLf," ")

TheHowNew = TheHow.Replace(vbCrLf," ")

TheOperationNew = TheOperation.Replace(vbCrLf," ")

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 & " "

End If

If TheGetOther <> "" Then

TheGetOther = "Other: " & TheGetOther

End If

If Page.IsValid() Then

'strEmail = txtEmail.Text

'Location = Location.Text

myMessage.From = "xxxxx...@xxxxxxxxx.com"

' myMessage.To = strEmail

MyMessage.To = "xxxxxx...@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 _

& " " & vbCrLf _

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

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

& "<td> Employer's Premises? " & premises & " " & vbCrLf _

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

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

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

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

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

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

& "<td> Job Title: " & TheJobTitle & " " & "</td>" & vbCrLf _

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

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

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

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

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

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

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

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

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

& "<td> Date: " & 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>

<h3><center>Wheeler's Accident Investigation
Form</center></h3>

<%--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--%>

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>

Employer's Premises

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

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

Job site

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

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

</td>

<td>

Date of accident

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

</td>

<%--____________________________________________________________________________--%>

<%--ROW 2--%>

Who was injured?

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

</td>

Employee <asp:CheckBox id=Checkemp
runat="server" />

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

</td>

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

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

</TD>

<%--____________________________________________________________________________--%>

<%--ROW 3--%>

<tr>

<td>

Date of Hire <asp:textbox id="Hiredate"
runat=server/>

</td>

<td>

Job Title or Occupation <asp:textbox
id="occupation" runat=server columns="25"/>

</td>

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

</td>

</Table>

<%--____________________________________________________________________________--%>

<%--Row 4--%>

<tr>

<td>

What was employee doing when injury occurred?

What machine or tool was being used? What type of operation?

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

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

</td>

</tr>

<%--____________________________________________________________________________--%>

<%--Row 5--%>

<td> How did injury occur? List all objects
and substances involved.

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

</td>

</tr>

<%--____________________________________________________________________________--%>

<%--Row 6--%>

<tr>

<td> 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> PLEASE INDICATE ALL OF
THE FOLLOWING WHICH CONTRIBUTED TO THE INJURY:

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

<asp:ListItem style> Improper
instruction</asp:ListItem>

<asp:ListItem> Lack of training or
skill</asp:ListItem>

<asp:ListItem> Operating without
authority</asp:ListItem>

<asp:ListItem> Horseplay</asp:ListItem>

<asp:ListItem> Physical or mental
impairment</asp:ListItem>

<asp:ListItem> Failure to
secure</asp:ListItem>

<asp:ListItem style> Failure to
lockout</asp:ListItem>

<asp:ListItem> Unsafe position</asp:ListItem>

<asp:ListItem> Improper dress</asp:ListItem>

<asp:ListItem> Improper protective
equipment</asp:ListItem>

<asp:ListItem> Unsafe equipment</asp:ListItem>

<asp:ListItem> Poor
housekeeping</asp:ListItem>

<asp:ListItem> Unsafe arrangement or
process</asp:ListItem>

<asp:ListItem> Poor ventilation</asp:ListItem>

<asp:ListItem> Improper
guarding</asp:ListItem>

<asp:ListItem> Improper
maintenance</asp:ListItem>

<asp:ListItem> Inoperative safety
device</asp:ListItem>

</asp:CheckBoxList> Other <asp:TextBox columns = "50" id="GetOther"
runat=server/>

</td>

</tr>

<%--____________________________________________________________________________--%>

<%--Row 8--%>

<tr>

<td colspan= "3"> 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"/>

</tr>

</td>

<%--____________________________________________________________________________--%>

<%--Row 9--%>

<tr>

<td> Was employee trained in the appropriate
use of Personal Protective Equipment/Proper safety procedures?

<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>

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

<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>

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> 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>

<td width="400"> Name of person submitting
this form:

<asp:textbox id="Submitter" runat=server columns="40"/> </td>

<td> 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" <nem...@msn.com> wrote in message
news:a279a63a3f40f5...@msnews.microsoft.com...

Alexey Smirnov

unread,

May 27, 2007, 10:23:29 AM5/27/07

On May 25, 11:08 pm, "dancer" <dan...@microsoft.com> wrote:
> 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

Alexey Smirnov

unread,

May 27, 2007, 1:13:46 PM5/27/07

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.

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