C# - SmtpException Was Unhandled By User Code

Apr 6, 2010

smtpException was unhandled by user code

void sendMail()
MailMessage mail = new MailMessage();
mail.From = new MailAddress("abc@gmail.com", txt_name.Text);
mail.Subject = txt_subject.Text;
mail.Body = txt_body.Text;
SmtpClient smtp = new SmtpClient("smtp.gmail.com");
smtp.EnableSsl = true;
NetworkCredential yetki = new NetworkCredential("abc@gmail.com", "11111111");
smtp.Credentials = yetki;
Response.Write("mailiniz başarılı bir şekilde gnderilmiştir");
protected void btn_gonder_Click(object sender, EventArgs e)


Send Email - Error "System.Net.Mail.SmtpException Was Unhandled By User Code"

May 11, 2008

I'm trying to send an email with Asp.net but I'm getting this message:

System.Net.Mail.SmtpException was unhandled by user code
Message="Failure sending mail."

I don't know if I'm missing something

I'm using this code:


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DataSource Controls :: Insert The Values Entered By User Into The Database - SqlException Was Unhandled By User Code

Aug 27, 2008

I have a web form which takes fname, lname, age and address from a user. User enters the values and clicks submit button. I want to insert the values entered by user into the database. But when i run the project. it gives the following error at conn.Open(); SqlException was unhandled by user code:

Cannot open database "EmployeeRecordSystem" requested by the login. The login failed.
Login failed for user 'FAISALPCASPNET'.

Below is my code of connecting to database and storing values into it.

string fname = TextBox1.Text;
string lname = TextBox2.Text;
int age = int.Parse(TextBox3.Text);
string address = TextBox4.Text;
SqlConnection conn =
new SqlConnection();conn.ConnectionString =
@"Data Source=FAISALPCSQLEXPRESS;Initial Catalog=EmployeeRecordSystem;Integrated Security=True";
string query =
"INSERT INTO Employee (Fname, Lname, Age, Address) VALUES (' " + fname +
"', '" + lname +
"', '"+ age + "', '" + address +
SqlCommand cmd =
new SqlCommand(query, conn);

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IndexOutOfRangeException Was Unhandled By User Code

Jan 23, 2009

I am getting an error when I reach line 147. It is saying that table 24 (the 25th table) does not exist. why I am limited to 24 tables? Is there any way that I can increase this limit to 36 tables? The error is:

IndexOutOfRangeException was unhandled by user code Canot find table 24


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Web Forms :: ArgumentOutOfRangeException Was Unhandled By By User Code

Jun 21, 2010

Specified argement was out of range of valid values. Parameter name i: That was my error see the code below:


Was is causing the error and how do I fix it?

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C# - System.Web.HttpException Was Unhandled By User Code?

Apr 3, 2011

I am getting the below exception when I run my ASP.NET/C#/SQL project on an XP box:


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Web Forms :: NullReference Exception Unhandled By User Code?

Mar 18, 2011

I'm working on having two forms that communicate together. In order to do this, I am passing public value from the source page. Here's how I did it:

In the source page I have:

Public ReadOnly Property CurrentCity() As String
Return txtboxfake.Text
End Get
End Property
Then under page_load of the page I have:
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
txtteam.Text = PreviousPage.CurrentCity
txtboxdate.Text = Calendar1.SelectedDate
End Sub

For some reason I keep getting an error that says "NullReference exception unhandled by user code" that points to txtteam.text = PreviousPage.CurrentCity.

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Argument Null Exception Was Unhandled By User Code?

Apr 11, 2009

I have this message whenever I run the code and enter the Button2 button

The Code inside that button is as follows:


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Error - System.NullReferenceException Was Unhandled By User Code

Apr 24, 2009

I am new to C#. I was doing pretty well, until I ran into the "System.NullReferenceException was unhandled by user code Message="Object reference not set to an instance of an object" error.

Here is the code:

String[] strRoutes;
int k = 0;
String GetRoute(String route)
strRoutes[k] = route;
return route;

Basically I have a gridview using ItemTemplate that calls this function. It may seem like a useless exercise the way it is written, but in the end I want to sort the array then grab the distinct routes in that array.

The gridview piece:

<asp:Label ID="Label4" runat="server"
Text='<%# GetRoute(Eval("OrderRoute").ToString()) %>'></asp:Label>

I don't think the problem is in gridview, it is stopping at the k++.

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System.Data.EntityException Was Unhandled By User Code

Jan 6, 2011

I am doing the MVC Music Store on VS 2010 and I get this expection: System.Data.EntityException was unhandled by user code Message=The underlying provider failed on Open.



at System.Data.EntityClient.EntityConnection.OpenStoreConnectionIf(Boolean openCondition, DbConnection storeConnectionToOpen, DbConnection originalConnection, String exceptionCode, String attemptedOperation, Boolean& closeStoreConnectionOnFailure)
at System.Data.EntityClient.EntityConnection.Open()
at System.Data.Objects.ObjectContext.EnsureConnection()
at System.Data.Objects.ObjectQuery`1.GetResults(Nullable`1 forMergeOption)
at System.Data.Objects.ObjectQuery`1.System.Collections.Generic.IEnumerable<T>.GetEnumerator()
at System.Linq.Enumerable.Single[TSource](IEnumerable`1 source).....

It happens at the Album ablum line above. I checked and SQLExpress is running with login to Local system.

Complete code for Controller is:


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DataSource Controls :: SqlException Was Unhandled By User Code

Mar 22, 2010


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DataSource Controls :: OledbException Was Unhandled By The User Code

May 3, 2010

I'm stuck with this query. I've tried a lot but ended up with no clue. Here is my sql query which is worrying me.. sqlselect = "select qo.OrderDate,qo.RequiredDate,qo.ShippedDate" & _

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Error - FormatException Was Unhandled By User Code In Linq?

Apr 7, 2010

Look below this codes throw me : FormatException was unhandled by user code


satis.KDV = Decimal.Parse((from o in genSatisctx.Urun where o.ID == UrunID select o.Kdv).ToString()); How can i rewrite linq query?

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Visual Studio :: System.TypeInitializationException Was Unhandled By User Code

Oct 28, 2009

I am busy with an e-commerce web application using visual studio 2005 and IIS 7

I got this error

System.TypeInitializationException was unhandled by user code

Message="The type initializer for 'ShopConfiguration' threw an exception."




at ShopConfiguration.get_DbProviderName()
at GenericDataAccess.CreateCommand() in c:inetpubwwwrootBeadafricanApp_CodeGenericDataAccess.cs:line 63
at CatalogAccess.GetDepartments() in c:inetpubwwwrootBeadafricanApp_CodeCatalogAccess.cs:line 28
at UserControls_DepartmentsList.Page_Load(Object sender, EventArgs e) in c:inetpubwwwrootBeadafricanUserControlsDepartmentsList.ascx.cs:line 22
at System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e).....

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Web Forms :: System.servicemodel.protocolexception Was Unhandled By User Code

Oct 11, 2010

i am using the page asynchronousTask to call the wcf service which is reside in another project in same solution for that i am using following code

protected void Button1_Click(object sender, EventArgs e)
PageAsyncTask pat = new PageAsyncTask(BeginDoWork, EndDoWork, null, null);
IAsyncResult BeginDoWork(object sender, EventArgs e, AsyncCallback acb, object extraData)
nor = new ServiceReference1.Service2Client();
return nor.BeginDoWork(acb ,extraData );//first null value is any call back method
//return nor.BeginProductList(acb, extraData);
void EndDoWork(IAsyncResult ar)

but in the endDoWork method it will show the following error

system.servicemodel.protocolexception was unhandled by user code

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Sqlexception Was Unhandled By User Code Using Sqlexpress 2005 And VS 2008

Jun 1, 2010

I did executed a db - contact form page successfully in the same project with the same connection string, but for this page its doing error and so I commented the binary file saving codes and all and put just simple 2 fields to see if the db is connecting and surprisingly getting sqlexception error and no data is written to the db. I am using sqlexpress 2005 and VS 2008. After this code I am listing the error I got.

Imports System.Data.SqlClient
Imports System.IO.FileInfo
Imports System.Data
Partial Class picture2
Inherits System.Web.UI.Page
Protected Sub upButton_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles upButton.Click
Dim ctr As Integer = 0
Dim fleName As String
Dim fleLength As Integer
fleName = FileUpload1.FileName
fleLength = FileUpload1.PostedFile.ContentLength
Dim fleDatasource As New SqlDataSource
fleDatasource.ConnectionString = ConfigurationManager.ConnectionStrings("CandidatesConnectionString").ToString()
fleDatasource.InsertCommandType = SqlDataSourceCommandType.Text
fleDatasource.InsertCommand = "INSERT INTO Picture (picLength,picName) values (&picLength, &picName)"
fleDatasource.InsertParameters.Add("picLength", fleLength)
fleDatasource.InsertParameters.Add("picName", fleName)
----------------------- executed and now the prg returns to my code with the following sqlexception error box and while expanded I got this info ------------------------
message - Incorrect syntax near "&"
Line number 1
Errorcode -2146232060

in order to evaluate an indexed property, the property must be qualified and the arguments must be explicitly supplied by the user. fleDatasource.Insert() the prg stops in the code with the green highlight on the fleDatasource.Insert().

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Security :: CryptographicException Was Unhandled By User Code - Key Not Valid For Use In Specified State

Mar 1, 2011

void ReadKey(SymmetricAlgorithm
byte[] converted =
byte[] bytes =
algorithm.Key = ProtectedData

I am getting the following exception "Key not valid for use in specified state"

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Forms Data Controls :: System.IndexOutOfRangeException Was Unhandled By User Code

Nov 30, 2010

I'm trying to do a master-detail by first search the database when a user click on the search button. Then display the result to a ListView control. After that, if the user click on the hyperlink, it displays the detail on the Formview control. Below are my code:


And here's the part that causes the error:


The error is on this line: string strID = ltvLusHmoob.DataKeyNames[e.Item.DataItemIndex].ToString();

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Security :: System.Data.SqlClient.SqlException Was Unhandled By User Code

Jan 25, 2010

I am useing sql and vwd.

i created the db on sql and used database explorer to connect it to vwd.

it keeps failing at step 5 (con.open())

i think i listed all relevant code, but if i missed something let me know and ill post it.

what am i missing.


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Web Forms :: Fill The Data Into The Database - SqlException Is Unhandled By User Code

Oct 22, 2010

I am making a login page in asp.net. when am trying to fill the data into the database it can give the error..."Incorrect syntax near 'Password'." my code is

SqlConnection sqlConnection = new SqlConnection("Data Source = DELLVOSTRO; Initial Catalog = ALPHA; User Id= sa; Password= intransit");
string queryString = ("INSERT INTO LOGIN(User_Id, Password, Confirm Password, E_Mail, Security_Question, Security_Answer) VALUES ('" + CreateUserWizard1.UserName + "','" + CreateUserWizard1.Password + "','" + CreateUserWizard1.ConfirmPassword + "','"
+ CreateUserWizard1.RequireEmail + "','" + CreateUserWizard1.Question + "','" + CreateUserWizard1.Answer + "')");
SqlCommand cmd = new SqlCommand(queryString, sqlConnection);

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Installation :: Registry Value Doesn't Exist - HttpException Was Unhandled By User Code

Apr 21, 2009

I was researching an issue relating to Excel automation and one of the website recommended to modify the machine.config file. So following I took the following steps:

1. Browsed to folder "c:WINDOWSMicrosoft.NETFrameworkv2.0.50727".
2. Backed Up "machine.config" file.
3. Edited the machine. config file. Re-run the solution. It didn't work.
4. So I restored the machine.config file.

This is the only thing I did. So now whenever I'm running my solution, I get the following error: Unable to make the session state request to the session state server. Please ensure that the ASP.NET State service is started and that the client and server ports are the same. If the server is on a remote machine, please ensure that it accepts remote requests by checking the value of HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesaspnet_stateParametersAllowRemoteConnection.

If the server is on the local machine, and if the before mentioned registry value does not exist or is set to 0, then the state server connection string must use either 'localhost' or '' as the server name. The Build is succeed but the following code of global.asax.vb fire this error:

Application_Error(ByVal sender
As Object, ByVal e
As EventArgs)
Dim err As Exception = Server.GetLastError()
'Response.Write("<h1>" & err.InnerException.Message & "</h1>")
'Response.Write("<pre>" & err.ToString & "</pre>")
Dim vErr As
vErr = err.InnerException.Message.ToString()
Catch ex
As Exception
vErr = "Unknown Server Error"
End Try
'Response.Write("<h1>Polaris.Net Server Error.<BR>Please provide any helpful comments and click the [Submit] button to send details of this error to the systems department.</h1>")
Session("ServerError") = vErr
End Sub

I tried all the googled solutions but didn't work. I even copied the whole solution, including the new web.config file but to no avail.

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DataSource Controls :: Connect To Sqlserver - Invalidoperationexception Was Unhandled By User Code

Jan 6, 2010

i am getting this error, trying to connect to sqlserver! senario! im trying to connect 2 tables with corresponding information.

eg: table 1 has (item no., picture and link) table 2 has (all the information pertaining to the item number and picture meaning when you click on the link it has to link you back to the same picture with more information about it! what could possibly be wrong??

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DataSource Controls :: System.FormatException Was Unhandled By User Code - Input String Was Not In A Correct Format?

Jan 20, 2011

"System.FormatException was unhandled by user code - Input string was not in a correct format"
This is driving me crazy! Can anyone see what the problem is?


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Web Forms :: System.FormatException Was Unhandled By User Code Message=Input String Was Not In A Correct Format

Sep 19, 2010


If the table no data is displayed this error:

System.FormatException was unhandled by user code Message=Input string was not in a correct format.


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DataSource Controls :: Reading Excel Files To Store Into Sqlserver Database - OleDbException Was Unhandled By User Code

Feb 1, 2010

i've got some problem reading excel files to store into sqlserver database. currently my code has a fileupload control and a button for me to save the excel file into a folder and read the data inside the excel file and write it into the sql database. The code works only if the excel sheet name is Sheet1.xlsx, however i tried upload a diff file named ImportUserFile.xlsx and it gave me the exception below. 'ImportUserFile$' is not a valid name. Make sure that it does not include invalid characters or punctuation and that it is not too long. i have also tried other file names and it seemed only Sheet1.xlsx works.


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Forms Data Controls :: Throw The Exception Back To Page_Load Error: ArgumentNullException Was Unhandled By User Code

Nov 19, 2010

I'm trying to throw the exception back to Page_Load but the throw statement causes error: ArgumentNullException was unhandled by user code. How can that be fixed? Also, I can't see Label1.Text displayed on the page after the ArgumentNullException occurs because the page is not re-load. If there is no exception, it's fine to not reload the page. How can I see the Label1.Text displayed?

protected void Page_Load(object sender, EventArgs e)
...do something here...
catch (ArgumentNullException ae)
Label1.Text = ae.Message;
Label1.Style.Add("visibility", "visible");
catch (Exception ex)
...do something here...
protected void ImageButton1_Click(object sender, ImageClickEventArgs e)............................

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Web Forms :: Try To Catch Error "Invalidoperationexception Was Unhandled By User Code"

Jul 29, 2010

I have text box get data from dataread. Here my code:

OleDbCommand com = new OleDbCommand("select sid from TableOne where pid = " + "'" + PID.SelectedValue + "'" + " and gid = " + "'" + GID.SelectedValue + "'" + " and unitid = " + "'" + tid.SelectedValue + "'");
Txtsid.Text = myDataReader[0].ToString().Trim();

I got the run time error at line: Txtsid.Text = myDataReader[0].ToString().Trim(); Invalidoperationexception was unhandled by user code. No data exists for the row/column. How to try catching those errors?

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DataSource Controls :: Error Msg "Null Reference Was Unhandled By User Code"

Jan 16, 2010

I downloaded a sample Rolodex from here: [URL] the file to download is at the bottom of the page and it is called 'RolodexDatalist.zip (6.71 kb)' So I changed the HTML to it points to my SQL Server DB. I changed the ConnectionString to this:

<add name="CustomersConnectionString" connectionString="Data Source=EXCEL-4J2W8KYNPSQLEXPRESS;Initial Catalog=Customers;Integrated Security=True"
providerName="System.Data.SqlClient" />

Now, everything points to my DB! I thought, ok great, this should be pretty easy. However, when I debug, I get this error message: 'Null reference was unhandled by user code. Object reference not set to instance of an object. Troubleshooting Tips: use the "new" keyword to set an instance of an object.' This line is yellow:

Dim conStr As String = ConfigurationManager _
Here is the code-behind:
Imports System.Data
Imports System.Data.SqlClient
Imports System.Collections.Generic
Partial Class VB
Inherits System.Web.UI.Page
Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
If Not IsPostBack Then
ViewState("CurrentAlphabet") = "ALL"
End If
End Sub
Private Sub BindDataList()
Dim conStr As String = ConfigurationManager _
Dim con As New SqlConnection(conStr)
Dim cmd As New SqlCommand("spx_GetContacts")
cmd.Connection = con
cmd.CommandType = CommandType.StoredProcedure
cmd.Parameters.AddWithValue("@Alphabet", ViewState("CurrentAlphabet"))
dlContacts.DataSource = cmd.ExecuteReader()
If ViewState("CurrentAlphabet").ToString().Equals("ALL") Then
lblView.Text = "all Contacts."
lblView.Text = "Contacts whose name starts with " & _
End If
End Sub
Private Sub GenerateAlphabets()
Dim alphabets As New List(Of Alphabet)()
Dim alphabet As New Alphabet()
alphabet.Value = "ALL"
alphabet.isNotSelected = Not alphabet.Value _
For i As Integer = 65 To 90
alphabet = New Alphabet()
alphabet.Value = [Char].ConvertFromUtf32(i)
alphabet.isNotSelected = Not alphabet.Value _
rptAlphabets.DataSource = alphabets
End Sub
Protected Sub Alphabet_Click(ByVal sender As Object, ByVal e As EventArgs)
Dim lnkAlphabet As LinkButton = DirectCast(sender, LinkButton)
ViewState("CurrentAlphabet") = lnkAlphabet.Text
End Sub
End Class

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MVC :: RenderAction With 2 Beta Error "System.Web.HttpException Was Unhandled By User Code"

Nov 25, 2009

For the life of me, can't figure this out. Basic RenderAction in Site.Master, <% Html.RenderAction("Latest", "News"); %>, but it's throwing an error: System.Web.HttpException was unhandled by user code

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WCF / ASMX :: FaultException Was Unhandled By User Code - "Server Was Unable To Process Request"

Mar 3, 2011

I have created a web service that interacts with my DAL. It has the usual kind of methods, create, retrieve, update and delete. I have published this web service to our live Windows Server and I can see the web serice URL. The web service works on a few method calls but does not work specifically for one object. I am getting the following error: Fault Exception was unhandled by user code. "Server was unable to process request. ---> Data is Null. This method or property cannot be called on Null values."

To summarise: Web service is live, I can see it in my browser. Some method calls work. One specific one does not. I have verified that the method works (it is just calling a SQL stored proc that does return data).

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Error Occur "InvalidOperationException Was Unhandled By User Code A Form Tag With Runat=server"

May 23, 2007

i got an error like this InvalidOperationException was unhandled by user code A form tag with runat=server must exist on the Page to use SetFocus() or the Focus property. my code is:

protected void Page_Load(object sender, EventArgs e)

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Access :: Visual Studio Hang On MyConnection.Open() Error "OleDbException Was Unhandled By User Code"

Feb 3, 2008

I made and ASP.Net application with C# 2005 with Access database. In my development machine I could run my application and do some actions that connect to database. I use myConnection.Open() method to connecting to database. I also call myConnection.Close() method after each call to opening. But sometimes the application crashes and visual studio hang on myConnection.Open()and show this error message : " OleDbException was unhandled by user code". I restart application but that problem remains and program hang on myConnection.Open() again.

After restarting IIS this problem disappears. But after some running, the problem appears again. I also see this on our host machine. I think that this is a conflict problem between IIS and Access database but why at most time its running fine and occasionally crash occurs? My system is WinXP with SP2 and IIS 5.1.

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Visual Studio :: How To Fix Argument Exception Was Unhandled By Code

Nov 4, 2009

I suddently get "Argument Exception was unhandled by code" showing its green code line when running my asp.net project in debug mode and a exception occuring in the aspx code behind page(aspx.cs) Why doesn't it allow me to debug anymore (yellow debug line) that I can then fix and step through on the fly but now just shows me the problem code(green line) and ends my debug session? Is there a debug option I can change to fix this?

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Configuration :: Event Code - 3005 An Unhandled Exception Has Occurred?

Nov 3, 2010

Actually I inherited this project, my job is enhance and debug this project. Just now my manager send me a log file ask me to debug, have no choose, I must settle this problem. according to the log file, I only know this bug occur in my login function,but I test in my local solution it can work well, no problem, it only appearing in live server. so I suspense it was server error, my manager ask me prove him, so any can explain to me what the log file mean? Event code: 3005

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System.Net.Mail.SmtpException : Mailbox Unavailable

Sep 14, 2010

I've been getting the following exception when trying to send an e-mail using System.Net.Mail:

Unhandled exception in Service Thread:

System.Net.Mail.SmtpException: Mailbox unavailable. The server response was: Requested action not taken: mailbox unavailable
at System.Net.Mail.DataStopCommand.CheckResponse(SmtpStatusCode statusCode, String serverResponse)
at System.Net.Mail.SmtpConnection.OnClose(Object sender, EventArgs args)
at System.Net.ClosableStream.Close()
at System.Net.Mail.MailWriter.Close()
at System.Net.Mail.SmtpClient.Send(MailMessage message)

Does anyone know what this could be caused by?

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Event Code: 3005 / Event Message: An Unhandled Exception Has Occurred.

Nov 18, 2009

Machine: WIN2K3, ASP.NET application, .NET 2.0 with June 2007 hotfix installed recently.

Facing daily 1000 errors with the same type

Event code: 3005

Event message: An unhandled exception has occurred.

apart from these am facing below errors as well: Exception of type 'System.OutOfMemoryException' was thrown. Object reference not set to an instance of an object. The remote server returned an error: (414) REQUEST URI TOO LONG. Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding.

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System.Net.Mail - Using Incorrect Password Returns SmtpException With Incorrect Error Message

Nov 12, 2009

When I authenticate with a bad password to an SMTP server, it says "Mailbox Unavailable" as the error message for the SMTPException that is raised. I would expect it to say "Bad Password" or similiar. Is this a bug in System.Net.Mail? [Code]....

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Web Forms :: System.Net.Mail.SmtpException: Failure Sending Mail

Sep 17, 2010

'System.Net.Mail.SmtpException: Failure sending mail. ---> System.IO.IOException: Unable to read data from the transport connection: net_io_connectionclosed. at System.Net.Mail.SmtpReplyReaderFactory.ProcessRead(Byte[] buffer, Int32 offset, Int32 read, Boolean readLine) at............................

getting the above error when sending mail from asp.net 2.0

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SMTPException:"Failure Sending Mail"

Mar 30, 2009

In my asp.net 3.5 web application, I try to send email to multiple persons (almost 100) using for loop.
It works fine when email has no attachment. But, when email contains the large size attachment (300 KB), after sending 25 emails, it gives a smtpexception:"Failure sending mail".

I have tried using different size of attchment files and I noticed that its giving an exception when the email attachment size reached about 7 MB. (total size of the emails sent with attachment).

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Web Forms :: User Controls Are Null When Referenced Inside The Code Behind For The User Control?

Sep 1, 2010

I have an ASP.NET 4.0 application with some simple user controls. The user controls work fine on the design surface (VS.NET 2010), but when they're loaded during application execution, nothing shows up.

Futhermore, the various child controls of the user controls are null when referenced inside the code behind for the user control.

The code behind for the user control executes as expected, but any reference to child controls are null.

It's like ASP.NET is never parsing the ASCX to create the instances of the child controls.

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