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bug: subtract value from double returns invalid value!

Posted By:      Posted Date: September 01, 2010    Points: 0   Category :WPF
Dim b as double  = 0.8 Dim a as double = 1 - b a contains the value 0.1999999996 in stead of 0.2 ???????????????????

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SslStream.Read() - Returns invalid data

Hey,I am currently attempting to implement a multi-threaded C# socket, using SSL (.pem file/certification/private key combo) server using Visual Studio C# Express.I have successfully made the client application establish a connection, and send data, which appears in plain, de-crypted text on the server - this works.However, I am 'polling' the socket to see if data is available to read.Here is some code which is appropriate:----        public void Process(int threadId)        {            int BytesRead = 0;            try            {                Master.Log("BEGIN READ");                sslStream.ReadTimeout = 5000;                BytesRead = sslStream.Read(bytes, 0, bytes.Length);                Master.Log("READ " + BytesRead + " bytes");                if ( BytesRead > 0 )                {                   // process                }             } catch (IOException e) {                Log("Caught IOException: " + e.Message);                if (e.InnerException != null)                    Log("=========> INNER IOException: " + e.InnerException.Message);         }---- Here is some console output when running the application:---------LOG: Authentication successfulLOG: BEGIN READLOG: READ 140 bytesLOG: [Thread 0] [Client 1] [Address] Client.ProcessDataReceived()Text received from client: Testing

SqlCommand.ExecuteNonQuery() returns -1 when doing Insert / Update / Delete

Sometimes you end up with a return value of -1 when using the SqlClient.SqlCommand.ExecuteNonQuery method.

Why is that?

Well, the ExecuteNonQuery method is there for statements for changing data, ie. DELETE / UPDATE /INSERT, and the returned value are the number of rows affected by that statement.

When checking the documentation we can see that there are some conditions that return -1.

For UPDATE, INSERT, and DELETE statements, the return value is the number of rows affected by the command.

When a trigger exists on a table being inserted or updated, the return value includes the number of rows affected by both the insert or update operation and the number of

rows affected by the trigger or triggers. For all other types of statements, the return value is -1. If a rollback occurs, the return value is also -1.

Invalid length for a Base-64 char array for my coding in ASP.net C#. How to solve it ?


Hi Friends ,

I have done encrypted password and decode but i got error  like  this  " Invalid length for a Base-64 char array" .

Pls help . Thanks


psswd = txtPassword.Text;

pwed = base64Decode(psswd);

public string base64Decode(string sData)
            System.Text.UTF8Encoding encoder = new System.Text.UTF8Encoding();
            System.Text.Decoder utf8Decode = encoder.GetDecoder();
            byte[] todecode_byte = Convert.FromBase64String(sData);
            int charCount = utf8Decode.GetCharCount(todecode_byte, 0, todecode_byte.Length);
            char[] decoded_char = new char[charCount];
            utf8Decode.GetChars(todecode_byte, 0, todecode_byte.Length, decoded_char, 0);
            string result = new String(decoded_char); return result;

sqldatasource's filter returns too few records


I have a puzzling issue.  This is in asp.net 2.0, using vb.  I have a gridview that is bound to a sqldatasource.  Here is the datasource code:

<asp:SqlDataSource ID="fellowsSqlDataSource" runat="server"
        ConnectionString="<%$ ConnectionStrings:PFPFellowsConnectionString %>"
        ProviderName="<%$ ConnectionStrings:PFPFellowsConnectionString.ProviderName %>"
        FilterExpression="{0}"  >
            <asp:SessionParameter Name="psuaccessid" SessionField="username" />         

Linq to SQL returns null for DateTime fields.


I have a linq to sql entity class in which I declared some DateTime fileds like this:

[Column(DbType = "smalldatetime")]
public DateTime? StartDate { get; set; }

And this is how I fetch data form repository:

return repository.Logs.OrderByDescending(l => l.LogID).FirstOrDefault();

All non DateTime fields are filled properly but all datetimes are null.

[Column(DbType = "smalldatetime")]

        public DateTime? StartDate { get; set; }

Linq2Sql error: "Invalid attempt to call Read when reader is closed."


I've read up on this error from other posts and on other sites, but haven't found a solid resolution to the issue yet. My setup is as follows:

I have a RepositoryBase class that fields certain db calls that all repositories need to perform. In one such call, "GetSecurityGroup", it works most of the time, but will seemingly at random throw an exception with the error "Invalid attempt to call Read when reader is closed." All other Repository classes inherit from this one, and they all use the same DataContext object, which I understand isn't thread safe. Since there could be multiple calls to the DataContext object on the same page, perhaps one is using the DataContext when the next tries to do so. I'm not sure. What can I do to ensure this doesn't happen?

Adding carriage returns between 2 dynamically created controls in an HtmlTableCell


The title pretty much explains it. Here is what i'm trying to do...

 Private Sub LoadGrid_CommentsField(ByVal Row As HtmlTableRow, ByVal BookingNumber As String, ByVal CommentsText As String)
  Dim Txt As TextBox
  Dim Cmd As ClickOnceButton.ClickOnceButton

  Txt = New TextBox
  Txt.ID = "txtComment_" & BookingNumber
  Txt.CssClass = "TFAppControls"
  Txt.TextMode = TextBoxMode.MultiLine
  Txt.MaxLength = 500
  Txt.Width = New Unit(95, UnitType.Percentage)
  Txt.Text = CommentsText

  Row.Cells(cComments).InnerHtml &= "<br/>"

  Cmd = New ClickOnceButton.ClickOnceButton
  Cmd.DisableAfterClick = True
  Cmd.Text = "Save Comments"
  Cmd.ID = "cmdSaveComments_" & BookingNumber
  Cmd.CssClass = "TFAppButtons"
  Cmd.EnableViewState = False
 End Sub

On the line where i try and update the InnerHtml, i get the following error; "Cannot get inner content of  because the contents are not literal."

How to CATCH "Invalid postback or callback argument" exception?



How can I catch this exception? I do not want it to stop my page execution. Can/Should I do that?

Server Error in '/' Application.
Invalid postback or callback argument.  Event validation is enabled using <pages enableEventValidation="true"/> in configuration or <%@ Page EnableEventValidation="true" %> in a page.  For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them.  If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation.
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.ArgumentException: Invalid postback or callback argument.  Event validation is enabled using <pages enableEventValidation="true"/> in configuration or <%@ Page EnableEventValidation="true" %> in a page.  For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally

WebResource.axd - Padding is invalid and cannot be removed error



I'm working on a site that is hosted externally, and the admin just sent me an email syaing they're getting this following error:


Event code: 3005 

Event message: An unhandled exception has occurred.

Event time: 11/17/2008 8:11:24 AM

Event time (UTC): 11/17/2008 8:11:24 AM

Event ID: 5d3b54c09a24463ca8fb03f22692e0bb

Event sequence: 731

Event occurrence: 3

Event detail code: 0

Application information:

Application domain: /LM/W3SVC/1776482879/ROOT-1-128713348984007217

Trust level: Full

Application Virtual Path: /

Application Path: D:\....

Machine name: ****

Process information:

Process ID: 2272

Process name: w3wp.exe

Account name: ****

Exception information:

Exception type: CryptographicException

Exception message: Padding is invalid and cannot be removed.

Request information:

Request URL: http://sitename/WebResource.axd?d=_O9D297IUE-qcgMP0yFe-w2&t=633468747532779057

Request path: /WebResource.axd

User host address:


Is authenticated: False

Authentication Type:

Thread ac

Invalid URL"" after copy or move a document.



We have an website that have 3 libraries. The "first Library" is used only to edit documents and it's called "my documents". When a user finish of edit your documents here, they start a workflow that will check fields in the document and move the document for the second library (using Sharepoint Designer Workflow - without custom actions).
In "second library" we have a big workflow. This WF has some steps for approve, collect feedback, generate sub-tasks and others things related for the document. This WF use many custom actions in (Sharepoint Designer).
When this WF arrives to the end, the document is moved to "third library", that is a official repository of documents in the enterprise.
The entire cycle works fine. But when someone creates a internal copy of the document in the "first library" to begin again the flow, we receive a Invalid Url error. It occurs when any update operations is executed over the document item, the value is conserved but the error is displayed. After it, we can not execute other workflows over the item.
If we save the document in local disk, delete the library item, and then upload it again, the problem is solved.

Some one have an idea about why and how solve it?  We are using WSS 3.0.

The following is an error registred in log file when you d

Picker returns nothing for BDC column in custom list


Playing with the BDC for the first time, running into some issues adding a Business Data column to a custom list.

I believe my ADF file is solid. I've been able to import that just fine and can use the application to drive various BDC-specific webparts (a Business Data List or Business Data Item, for example). It also seems to work when I manually enter information in my NewForm.aspx field and click the Check Names button (it verifies my entry and underlines it, creates link to profile when I view the list data).


If I try to use the picker, I get nothing. Enter a name I know is valid or a % and click the magnifying glass icon and I very briefly get the "Please Wait" message, then just an empty set with "Type into the search box above then press "Enter" to start your search" where my results should be.

Any pointers? Thanks.

User group invalid for new document



Defined a user group and a site column of type people/group directing to this group.

Also defined a content type and added the site column to this content type.

When I create a new word document of this content type, word opens displaying my site column ok. But when I enter it, I see that all active directory (AD) entries are displayed. I want it to display only those users I added to the user group I created. Moreover, users can select any user from AD, which makes defining a user group and a site column meaningless.

This problem is only in creating new documents with Word. If I edit properties of an already existing document in my site, everything is ok: I can select only the users in the group.


Invalid web service call, missing value for parameter: \u0027prefixo\u0027 (AutoCompleteExtender)


Good afternoon.

I'm trying to put an AutoCompleteExtender working, but i'm having an error, that i discovered with Fiddler, that is the reason that the autocomplete doesn't work:

> **{"Message":"Invalid web service call,
> missing value for parameter:
> \u0027prefixo\u0027."**,"StackTrace":"
> at
> System.Web.Script.Services.WebServiceMethodData.CallMethod(Object
> target, IDictionary`2 parameters)\r\n
> at
> System.Web.Script.Services.WebServiceMethodData.CallMethodFromRawParams(Object
> target, IDictionary`2 parameters)\r\n
> at
> System.Web.Script.Services.RestHandler.InvokeMethod(HttpContext
> context, WebServiceMethodData
> methodData, IDictionary`2
> rawParams)\r\n at
> System.Web.Script.Services.RestHandler.ExecuteWebServiceCall(HttpContext
> context, WebServiceMethodData
> methodData)","ExceptionType":"System.InvalidOperationException"}

This is the webservice code:

    Imports System.Web.Services
    Imports System.Web.Services.Protocols
    Imports System.ComponentModel
    Imports GcpBE750
    Imports ErpBS750
    Imports StdBE750
    ' To allow this Web Service to be called fro

Resume SharePoint Services Web Application and returns code 1387 error


Hello everyone! Newbie here. I would like to ask how to start the SharePoint Services Web Application on (WSS3.0,internal database, stanalone users) without getting error 1387 ?

I would love to provide more information regarding this issue but what I got is error 1387 displayed in the browser.

I look forward to seeing you guys feedback from your expertise angle.



System.InvalidOperationException: Invalid attempt to read when no data is present.


Invalid attempt to read when no data is present.

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.InvalidOperationException: Invalid attempt to read when no data is present.

Source Error: 

Line 53:             if (reader.HasRows)
Line 54:             {
Line 55:                 Response.Write(reader.GetString(0));

Here is my code:

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