.NET Tutorials, Forums, Interview Questions And Answers
Welcome :Guest
Sign In
Register
 
Win Surprise Gifts!!!
Congratulations!!!


Top 5 Contributors of the Month
sivanagamahesh
Post New Web Links

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

Posted By:      Posted Date: August 27, 2010    Points: 0   Category :ASP.Net
 

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:


View Complete Post


More Related Resource Links

MySql.Data.MySqlClient.MySqlException: Invalid attempt to access a field before calling Read()

  

I'm getting the Following Error.

 Invalid attempt to access a field before calling Read()
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: MySql.Data.MySqlClient.MySqlException: Invalid attempt to access a field before calling Read()

Source Error:


Line 132:        catch (Exception ex)
Line 133:        {
Line 134:            throw (ex);
Line 135:        }
Line 136:        finally
 

 

This error comes sometime and sometimes it doesnot come.

 

I tried to serach on mysql.com the same bug has been posted but no solution.

 


 


MySql.Data.MySqlClient.MySqlException: Invalid attempt to access a field before calling Read()

  

I'm getting the Following Error.

 Invalid attempt to access a field before calling Read()
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: MySql.Data.MySqlClient.MySqlException: Invalid attempt to access a field before calling Read()

Source Error:


Line 132:        catch (Exception ex)
Line 133:        {
Line 134:            throw (ex);
Line 135:        }
Line 136:        finally
 

 

This error comes sometime and sometimes it doesnot come.

 

I tried to serach on mysql.com the same bug has been posted but no solution.

 


 


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?


System.IO.IOException: Unable to read data from the transport connection

  
Hello,   I have an xml webservice calling another xml web service and occasionally i get the following error - any ideas why?Does this happen when the request is made or when reading the response? Also how i can prevent it from happening? Thanks   System.IO.IOException: Unable to read data from the transport connection: A blocking operation was interrupted by a call to WSACancelBlockingCall. ---> System.Net.Sockets.SocketException: A blocking operation was interrupted by a call to WSACancelBlockingCall   at System.Net.Sockets.Socket.Receive(Byte[] buffer, Int32 offset, Int32 size, SocketFlags socketFlags)   at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)   --- End of inner exception stack trace ---   at System.Net.ConnectStream.Read(Byte[] buffer, Int32 offset, Int32 size)   at System.IO.StreamReader.ReadBuffer(Char[] userBuffer, Int32 userOffset, Int32 desiredChars, Boolean readToUserBuffer)   at System.IO.StreamReader.Read(Char[] buffer, Int32 index, Int32 count)   at System.Xml.XmlTextReaderImpl.ReadData()   at System.Xml.XmlTextReaderImpl.InitTextReaderInput(String baseUriStr, TextReader input)   at System.Xml.XmlTextReaderImpl..ctor(String url, TextReader input, XmlNameTable nt)   at System.Xml.XmlTextReader..ctor(TextReader input)   at System.Web.Services.Protocols.SoapHttpClientProtocol.GetReaderForMessage(SoapClientMessage message, I

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 127.0.0.1] Client.ProcessDataReceived()Text received from client: Testing

System.Data.SqlClient.SqlException: Invalid object name

  

I am getting this error message

System.Data.SqlClient.SqlException: Invalid object name 'Members'.

The database name is ACEStaff

I copied it accross from my old server to my new one

The table name in the database is Acestaffrm.members. Is the Acestaff prefix giving me this problem. I notice other table have dbo. prefix

Any suggestions on the problem here

 


 


System.InvalidOperationException: Internal .Net Framework Data Provider error 12.

  

Hi,

I have created an application in which there are few forms. Each form has fields which are linked to a backend table/tables. My application is supposed to be accessed by multiple users concurrently. I ran a test where I created a class file in windows application and i ran a for loop in it to call the url of my application. I wanted to test the effect of firing around 200 queries to my query engine.

The test code is :

namespace MachineGun

{

static class Program

{

/// <summary>

/// The main entry point for the application.

/// </summary>

[STAThread]

The type 'System.Data.Linq.DataContext' is defined in an assembly that is not referenced. You must

  

Hi,

This is frustrating, and I don't know how to solve it.

I have a strange problem. I am adding a LinqDatasource object, and set the context:

        protected void LinqDataSource_ContextCreating(object sender, LinqDataSourceContextEventArgs e)
        {
            e.ObjectInstance = new KaruselaDataContext(ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString);
        }


Then I get this error:
The type 'System.Data.Linq.DataContext' is defined in an assembly that is not referenced. You must add a reference to assembly 'System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'.

 

On web.config I already have this:
<add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"/>

NOTE: The datacontext is in a different project (DLL proect) where I added a refernce to System.Data.Linq.

is there another way adding a refernce to a web project? or only though teh web.config?

Thanks.


Crystal Report gives System.AccessViolationException: Attempted to read or write protected memory. T

  

when a crystal report for same id is opened again at same time or refreshed then it gives the

"System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt."


Stack Trace is :-


Stack Trace:

[AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.]
CrystalDecisions.ReportAppServer.Controllers.DatabaseControllerClass.SetConnectionInfos(ConnectionInfos ConnectionInfos) +0
CrystalDecisions.CrystalReports.Engine.Table.ApplyLogOnInfo(TableLogOnInfo logonInfo) +362
CrystalDecisions.CrystalReports.Engine.ReportDocument.SetTableLogon(Tables tables, String user, String password, String server, String database, Boolean ignoreCase) +258
CrystalDecisions.CrystalReports.Engine.ReportDocument.SetDatabaseLogon(String user, String password, String server, String database, Boolean ignoreCase) +204
CrystalDecisions.

Data Points: Revisiting System.Transactions

  

The System.Transactions namespace of the Microsoft .NET Framework makes handling transactions much simpler than previous techniques. Read all about it this month.

John Papa

MSDN Magazine November 2006


Data Points: ADO.NET and System.Transactions

  

The Microsoft® . NET Framework versions 1. 0 and 1. 1 represented major changes in software development. However, one important thing that did not change much was support for distributed transactions.

John Papa

MSDN Magazine February 2005


Exchange 2000 WSS: Web Storage System Improves Exchange Data Accessibility

  

The Web Storage System (WSS) in Exchange 2000 is a Web-accessible database that stores any type of data such as e-mail, contacts, appointments, threaded discussions, and multimedia files, and renders the data in HTML in any browser. WSS is based on Internet standards, therefore data can be accessed through URLs, an Exchange OLE DB provider, drive mapping, XML, and Web Documenting and Versioning (WebDAV). This article discusses the WSS schema and how to extend the default schema for custom data. A sample application that uses a custom schema and a custom form to display WSS data is available for download.

Sean McCormick

MSDN Magazine May 2001


Business Data Error: System.OverFlowException

  

I have a Business Data Catalog file I've uploaded to connect to our back end Firebird DBMS through ODBC.

The SharePoint server is MOSS 2007 x64. The web front end server(s) all have an x64 Firebird Engine and ODBC driver with verified connectivity to Firebird.

When I use one of the methods, I can see connections being made to our Firebird server and the query being passed. I know the query returns results (it's a stored procedure with no parameters), but I get the following error "An error occurred while retrieving data from MROTest1. Administrators, see the server log for more information" in IE. If I look in the server logs, I see (12\Hive\Logs)

Exception handed to HandleRuntimeException.HandleException System.OverflowException: Arithmetic operation resulted in an overflow.     at System.Data.Odbc.OdbcDataReader.GetData(Int32 i, SQL_C sqlctype, Int32 cb, Int32& cbActualOut)

Fed Up With System.Data.Metadata.Edm.ObjectItemAssemblyLoader

  
I'm fed up with the random errors I'm getting on my ASP.NET 4, Entity Framework 4 web application lately. It seems to stem from something that System.Data.Metadata.Edm is doing with a call to System.Reflection.Assembly.GetTypes(). I keep getting the error that I complained about previously : Unable to load one or more of the requested types. Retrieve the LoaderExceptions property for more information. To display those Loader exceptions, I added the following to my global.asax file: Sub Application_Error...(read more)

Creating a SharePoint 2010 Web Part That Can Read and Write Data to an External Data Source

  
Learn to use Visual Studio 2010 to create a Visual Web Part that uses a BCS external content type in SharePoint Server 2010 to read and write data to the AdventureWorks sample database.

Sample: Creating a SharePoint 2010 Web Part That Can Read and Write Data to an External Data Source

  
Explore the code in this visual how-to article as you learn to use Visual Studio 2010 to create a Visual Web Part that uses a BCS external content type in SharePoint Server 2010.

System.Data.SqlClient.SqlException: Login failed for user . Reason: The account is disable

  

Hi All,

Thank you for advance.

I created a widows service for mail schedule with c#.net and sql server 2005 and it is working fine for past one year.

now sometimes i am getting the "System.Data.SqlClient.SqlException: Login failed for user '<UserName>'. Reason: The account is disabled." error.

then i restarted the windows service manually and working.

what is the problem in my sql server connection and how to fix that issue?


Categories: 
ASP.NetWindows Application  .NET Framework  C#  VB.Net  ADO.Net  
Sql Server  SharePoint  Silverlight  Others  All   

Hall of Fame    Twitter   Terms of Service    Privacy Policy    Contact Us    Archives   Tell A Friend