How-to Debug A WebMethod

Jan 21, 2011

I have an ASP.NET C# project consuming webservices and WebMethods are wrote in VB.NET with source code on a local IIS server. The WebMethod returns null, and I want to debug it to know why I get this.

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.net - VB 2010 Express: Debug.WriteLine Optimized Away Completely In Debug Version?

Aug 31, 2011

Simple question that does not seem to be covered: If I use a lot of Debug.WriteLine statements in my code, will they be completely absent in my production version?

I mean: Is the compiler smart enough to not emit any code for those calls? Or would I have to surround them by #if DEBUG..#end if directives?

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Asp.net - Convert A Webmethod From C# ?

Jan 12, 2012

I did the web method below using C#. I'm tryin to convert this into VB.NET, but I'm missing something. I'm using it with an ajax calling, from a paginator/sorter table plugin.

[WebMethod( EnableSession = true )]
public static object listaPessoas(int jtStartIndex = 0,
int jtPageSize = 0, [code].....

Second, I don't know how to return the message "OK" and the list of people.

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Using CreateControlCollection() From Within A WebMethod?

May 25, 2012

my code calls a WebMethod. Within that WebMethod I have the need to create a new control collection. In VB I would normally write:

Dim cc As System.Web.UI.ControlCollection = CreateControlCollection()

But because I'm inside a WebMethod, I get the error :

Cannot refer to an instance member of a class from within a shared method or shared member initializer without an explicit instance of the class.

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Asp.net - Executing A WebMethod From Javascript?

May 31, 2011

I'm trying to eliminate a VB.NET button on my aspx page. Trying to use javascript and ajax to execute the same code my vb had.I put in a script manager, set EnablePageMethods to true, added a static subroutine, and referred to it in my javascript function (BTW -- this seems a lot of work just to execute an existing subroutine). The javascript calls my code-behind and it almost works.Problem is, now I'm getting a NullReferenceException when SimulatePrintBatchClick tries to do anything with the controls.

Error is 'Object reference not set to an instance of an object', line is 'pnlVars.Controls.Clear'

Here's the code from UW.aspx:

<WebMethod()> _
Public Shared Sub PrintBatchFromJSWM()
Dim UWI As New UW

[code]....

when I run the above code in PrintBatch_Click it all executes just fine. I really don't understand why it bombs out as a subroutine.

Perhaps this is not the way to do this, but I'm at a loss for finding a different way. Originally this code was handled by an ASP/VB button, but the specs have called for it to be deleted.

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Javascript - Returning XML From Webmethod?

Jul 30, 2011

I am using an ajax PageMethod to call an asp.net webmethod. From there I'm trying to pass a lot of XML back to a callback javascript function.

Currently I just convert the XML into a string and pass it in that format. But it seems that if the string is too long it causes an error.

[Code]...

So my question is: Is there a better way to pass the XML from VB to javascript, or a way to allow large strings to be passed without error?

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Ajax - ASP.Net AutoCompleteExtender VB WebMethod Not Firing?

May 12, 2011

In a page to create new user accounts, we have a database with a little of allowable users. To streamline getting the Email address of the new user correct, we want to use an AutoComplete extended textbox.Now I know that WebMethods are working because I have a cascading-drop-down tied to web methods in another page.As I'm just starting on this page, the code is simple.The page itself:

<cc1:ToolkitScriptManager ID="ScriptManager2" runat="server"/>
<p></p> Please enter new user's Email:
<asp:TextBox ID="txtUser" runat="server" />
<cc1:AutoCompleteExtender runat="server" ID="autUser" TargetControlID="txtUser"

[code]....

I'm not even getting to the LogDebug statement. I've used all the same boilerplate code (Inherits, the 'WebService' tags, etc) that worked in the other WebMethod with the appropriate changes to the Class name but this really has me stumped.

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Asp.net - Calling .NET WebMethod Function From Javascript?

Jul 12, 2011

I have a VB.NET function which looks like this:

<WebMethod()> _
Public Shared Function AuthenticateUser(ByVal UserInfo As String, ByVal Password As String) As Boolean
Dim UserName As String

[code]....

It calls the function, but won't return a value. When walking through the code, my VB function does fire (it will return true so long as the correct password is typed in), but the javascript 'authenticated' value remains 'undefined'. It's like you can't return values from VB functions to javascript.

I also tried

if PageMethods.AuthenticateUser("UserName", "Password")
{
//Stuff
}

But still no luck.

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Asp.net - Pass Parameters To A Webmethod From Querystring

May 10, 2011

I'm developing a website with ASP and VB.NET 4. I'm also using the FullCalendar jQuery plugin, but I have a trouble: catching a parameter from querystring to the webmethod in the .asmx. I've tried to refer the querystring property with the Request.QueryString() and it doesn't work.

Here's the webmethod:

<%@ WebService Language="VB" Class="wbsCalendario" %>
Imports System.Web
Imports System.Data

[Code].....

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Asp.net - Passing Data To Knockout From Webmethod?

Jun 18, 2012

here my function

<WebMethod()>
Public Shared Function person() As List(Of Class1)
Dim initialState = {New Class1 With {.id = 1,

[Code]....

how to pass initialstate values to knockout?

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ASP.NET AJAX Auto-Complete Using WebMethod?

Mar 23, 2012

I'm trying to use an auto-complete, and it works fine if I call a function without a parameter in the web service:

<WebMethod()> _
<Script.Services.ScriptMethod()> _
Public Function GetCompanyNames2() As String()

[code].....

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Xml - WebMethod Return A Value And Call Other Method In .net?

Aug 18, 2009

I have a Web Service with one WebMethod for which return value is boolean.It accepts XML file as string and process data. How can I first return status as true and then call the ProcessData method.

As the processing data takes time I need to return true first and then process the data.

[webmethod]
Public function receiveData(ByVal xmlstr as string) as boolean
dim status as boolean=false
try

[Code]...

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C# - Object Being Passed Using Webmethod, Loses Some Values But Not All?

Jun 22, 2011

when calling a webmethod

[WebMethod]
public Profile synchronize(string MID, DeviceUploadData data)

The object DeviceUploadData has many properties, and a few of them are array's. My question is about the array specifically. It loses it's value once it's received on the webmethod end.This is the property inside DeviceUploadData

Private data() As DataObject
Public Property Data() As DataObject()
Get

[code]....

So the DataObject is populated with data, then once passed, on the other end, some of the DataObject properties are no longer populated. I haven't included the other properties in this example.

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C# - WebMethod Caches Images Not Entering Handler?

Nov 5, 2010

I have a WebMethod that recives HTML as parameter somthing like this:

Public Function ConvertHtmlToPdfListAnswer(ByVal dokument As Dokument) As Byte()

In this HTML my path to for example user signature looks like this:

Handlers/SzablonyListImgHandler.ashx?usid=2006

My handler starts like this:

Public Sub ProcessRequest(ByVal context As HttpContext) Implements IHttpHandler.ProcessRequest

and it takes parameter from context, creates query for databese and returns stream output like this:

If Not String.IsNullOrEmpty(context.Request.QueryString("usid")) Then
...
...
streamOut.WriteTo(context.Response.OutputStream)

My problem is that it fires onle once...what I mean is that when I call the service again it doesn't enter the handler but it already shows me the image when i check the HTML in debugger view. So when The user changes his signature in database the service method still returns the previous one...

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Jquery - Webmethod Always Returns 401 - Authentication Failed

Jul 5, 2010

Getting sick with asp.net permission, This time, I Just cant AJAX-CALL any kind of webmethod or i just get: Message":"Authentication failed. [Code] THERE ARE SOME MISTAKES ON THE SUCCESS STUFF I KNOW. THATS NOT THE PROBLEM FOR NOW. Firebug Console always return 401 Unauthorized when i Try an ajax call.

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WebMethod Not Working When Returning Relatively Large String?

Jul 6, 2010

I am using Virtual Basic with ASP.NET in Visual Studio 2008. I am using Webmethod to communicate from/to the server with the client. Data can be queried and returned in small amount, but when I try get a relatively large amount of data, it's returning me a Server 500 error. My data is 226561 character long, so it's not that large, but it's relatively larger than my other working testing set, which are about 10k character long.

JavaScript:
PageMethods.my_func("context", success);
function success(result, userContext, methodName) {

[code].....

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Javascript - WebMethod Not Working When Returning Relatively Large String

Dec 9, 2011

I am using Virtual Basic with ASP.NET in Visual Studio 2008. I am using Webmethod to communicate from/to the server with the client. Data can be queried and returned in small amount, but when I try get a relatively large amount of data, it's returning me a Server 500 error. My data is 226561 character long, so it's not that large, but it's relatively larger than my other working testing set, which are about 10k character long.

JavaScript:
PageMethods.my_func("context", success);
function success(result, userContext, methodName) {

[code]....

Is there anything I can change to increase WebMethod returned string length limit? Is there even a length limit or is it some other problem I could not see?

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Service AJAX Requests With Webmethod In ASPX Page

Jan 23, 2012

I am trying to service AJAX requests with a method in my .aspx page. For some reason I am not getting the data returned that I want.

mypage.aspx:
<%@ Page Language="VB" Title="My Page" %>
<%@ Import Namespace="System.Web.Services" %>
<%@ Import Namespace="System.Collections.Generic" %>

[Code].....

When I click mybutton I get an alert "error:" and then whole lot of HTML that says:

Unknown web method testmethod.
Parameter name: methodName

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Send And Receive Input Text To Webmethod Using Ajax Call?

Apr 22, 2012

I am trying to use the simple ajax script to webmethod as follows[code]...

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Asp.net - Javascript Calls To An Ajax WebMethod - Get Multiple Output Params Returned?

Apr 24, 2010

I know how to call a simple old fashion asmx webservice webthod that returns a single value as a function return result. But what if I want to return multiple output params? My current approach is to separate the params by a dividing character and parse them on teh client. Is there a better way.

[Code]...

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Unable To Use IntPtr (WindowsIdentity Token) As Input Param On WebMethod (ASMX Web Service)?

Jun 26, 2009

We're in a strange situation with a legacy winforms VB.NET 1.1 application using ASMX web services. Trying to send a user Token from a WindowsIdentity object as a parameter to a WebMethod. I will be adding a 'HACK: comment. System.Security.Principal.WindowsIdentity.GetCurrent().Token

The token is of type IntPtr, the first problem is the WSDL being generated doesn't support IntPtr with the error of 'unsupported type'I'm aware this is a big WTF question and sounds insecure, so any simple helpful alternatives are welcome but there are a lot of constraints on how we can change this system, including complications with the hosting environment. So I would just like to get our piece of data over to the web service to save a lot of other headaches.

[Code]...

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Unable To Copy File "obj\Debug\FYP.exe" To "bin\Debug\FYP.exe"

Jan 5, 2009

I have the following codes:

me.hide()
staff.show()

It run smoothly for the first time,but when I execute it for the second time,it occured the following errors:Unable to copy file "obj\Debug\FYP.exe" to "bin\Debug\FYP.exe". The process cannot access the file 'bin\Debug\FYP.exe' because it is being used by another process.

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.net - #if Not Debug In C#?

Aug 30, 2011

I have the line in vb code:#if Not Debug which I must convert, and I don't see it in c#?

Is there something equivalent to it, or is there some workaround?

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How To Use #IF DEBUG

Aug 31, 2010

Is it possible to assign a value to a class variable from inside a #IF DEBUG conditional? Basically what I want to do is conditionally execute some code from inside my main form load if I am running in DEBUG mode.[code]However, it seems like you cannot assign a value to a variable. I'm obviously not understanding the scoping correctly.I cant seem to put the #if DEBUG inside the Load.

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.net - Get The #if DEBUG To Work?

Jan 12, 2011

I have a simple application:Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

#If DEBUG Then
lblDebug.Text = "Debug"
#Else
lblDebug.Text = "Not in debug"
#End If

Now when I run it in VS, it prints "debug" like it should, but if i run the .exe, it still prints "debug". What do i have to do to get this to work right?

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Can't Set Debug Configuration

Jan 23, 2010

How do I select DEBUG or RELEASE configuration in Visual Basic 2008?The drop down list Project > Properties > Compile > Configuration that was in Visual Basic 2005 is gone from Visual Basic 2008.software developer

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Cannot Debug Or Compile

Feb 24, 2012

Im using Visual Studio 2008 in Windows 7. Recently I cannot debug(F5) any projects because this following error is appearing

Error while trying to run project: Could not load file or assembly 'WindowsApplication5' or one of its dependencies. The module was expected to contain an assembly manifest.

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Debug A DLL From VS2008?

Mar 31, 2010

I have a program written in VB.Net (Visual Studio 2008) that uses a DLL written in Visual C++ by another developer. I'd like to be able to step in to the C++ code as my code makes calls to methods in the DLL. Since the DLL is it's own solution, I don't think it can be included in my solution/project. I tried putting the DLLs pdb file in the debug/bin directory with the rest of my build and pdb files. However, when I get to the point in stepping through my code, and it gets to the dll call, it just steps right over the dll code. Do I have to manually load symbols?

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Get Pogram To Debug And Run?

Nov 12, 2011

I'm having a problem getting my program to run, and i have 0 errors.[code]...

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Getting Erorr When Try To Debug

Apr 19, 2010

I have built/rebuilt the files sevaral times.I have also renamed the file in the debug *.exe.The NetworkAssociation.exe file is in the debug folder.[code]

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