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• Server 2012 intermittently fails to respond to pings from single host, even with firewall disabled, but responds to non-ICMP requests fine

  - by James Westbury

  This one is kind of weird. I've got the following machines involved: DC01 - 10.1.2.42, Server 2012, domain controller & DNS server, physical machine nagiosv - 10.1.2.35, CentOS 6.4, Nagios, virtual machine CB01 - 10.1.3.81, Ubuntu 12.04 LTS, couchbase server, virtual machine So, I noticed something was wrong while configuring this new Nagios VM. I started seeing DC01's state flapping. I logged into nagiosv when I saw this happening, and attempted to ping DC01, both by FQDN and its IP address. Neither worked. I tried pinging the machine from CB01, which is another VM on the same virtual switch/physical NIC as nagiosv, and that worked fine. Pings still failing from nagiosv at this time. DC01 is also an internal DNS server, so I ran dig google.com from nagiosv, and was able to run a query against DC01 just fine: ;; Query time: 1 msec ;; SERVER: 10.1.2.42#53(10.1.2.42) ;; WHEN: Fri Nov 1 07:53:51 2013 ;; MSG SIZE rcvd: 204 Pings still failing from nagiosv, though. I can ping from DC01 to nagiosv, and that works, and I can still ping from other VMs on the same physical NIC into DC01, and that works. I should mention at this point that I've disabled the firewall on DC01 for testing purposes, and it doesn't make a damned bit of difference. (Even with the firewall enabled, I have a blanket exception for ICMP from the local subnet, so it shouldn't make a difference, but I figured I should test it anyway.) I loaded up Wireshark on DC01 and pinged it from nagiosv again. What I see is a bunch of echo requests coming in and not a single reply going back out. Filtered results here, showing all ICMP traffic during a 15-second period. A few more bits of info: There are no IP conflicts on the network. MAC addresses on the incoming pings match the MAC on the VM. There are no duplicate MACs on the network, as far as I can see. I have absolutely no idea why DC01 is failing to respond, here. Any ideas?

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• 2 servers, high availability and faster response

  - by user17886

  I recently bought a second webserver because I worry about hardware failure of my old server. Now that I have that second server I wish to do a little more then just have one server standby and replicate all day. As long as it's there I might as well get some advantage our of it ! I have a website powered by ubuntu 12.04, nginx, php-fpm, apc, mysql (5.5) and couchdb. Im currently testing configurations where i can achieve failover AND make good use of the extra harware for faster responses / distributed load. The setup I am testing nowinvolves heartbeat for ip failover and two identical servers. Of the two servers only one has a public ip adress. If one server crashes the other server takes over the public ip adress. On an incoming request nginx forwards the request tot php-fpm to either server a of server b (50/50 if both servers are alive). Once the request has been send to php-fpm both servers look at localhost for the mysql server. I use master-master mysql replication for this. The file system is synced with lsyncd. This works pretty well but Im reading it's discouraged by the (mysql) community. Another option I could think of is to use one server as a mysql master and one server as a web/php server. The servers would still sync their filesystem, would still run the same duplicate software (nginx,mysql) but master slave mysql replication could be used. As long as bother servers are alive I could just prefer nginx to listen to ip a and mysql to ip b. If one server is down, the other server could take over the task of the other server, simply by ip switching. But im completely new at this so I would greatly value your expert advice. Is either of the two setups any good ? If you have any thoughts on this please let me know ! PS, virtualisation, hosting on different locations or active/passive setups are not solutions im looking for. I find virtual server either too slow or too expensive. I already have a passive failover on another location. But in case of a crash I found the site was still unreachable for too long due to dns caching.

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• DevExpress AspxGridView filter in ObjectDataSource

  - by Constantin Baciu

  Yet another problem with DevExpress AspxGridView :) The context: One Page In the Page, a custom control In the custom Control, a AspxDropDown The AspxDropDown, has a DropDownWindowTemplate In the DropDownItemTemplate, I add a GridView and a paging/sorting/filtering enabled ObjectDataSource When handling the Selecting event of the ObjectDataSource, I should set filter parameters for the datasource. There filter parameters should come from the FilterRow of the AspxGridView (preferably using the AspxGriedView.FilterExpression property). The problem: the AspxGriedView.FilterExpression property is not set to the proper values (set by the user). Did anyone find a good implementation of what I'm trying to do here? Thanks a bunch. :)

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• Set page size using WIA (with scanner)

  - by Salvador Sarpi

  Hello, I'm using WIA to acquire images from a scanner with C#. I can scan the papers, but I can't set up the page size correctly, it always defaults to A4 and I need to use Letter or Legal sometimes. I tried with the WIA_DPS_PAGE_SIZE property, but when I try to set a value, I always get an error, that the value is out of the interval (tried a lot of possible values). I wan't to be able to use WIA_DPS_PAGE_SIZE = WIA_PAGE_AUTO (for automatic page size), but I can't find anything on the web related to this. Does anyone know a solution? thanks!

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• Passing multiple parameters in an MVC Ajax.ActionLink

  - by mwright

  I am using an Ajax.ActionLink to call an Action in a Controller, nothing special there. I want to pass two parameters to the Action. Is this possible using an Ajax.ActionLink? I thought that it would just be a matter of including multiple values in the AjaxOptions: <%= Ajax.ActionLink("Link Text", "ActionName", "ControllerName", new { firstParameter = firstValueToPass, secondParameter = secondValueToPass }, new AjaxOptions{ UpdateTargetId = "updateTargetId"} )%> Is it possible to pass multiple parameters? Where is a good place to learn more about the AjaxOptions?

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• Using telerik radGrid - how to set the Date format for autogenerated column in edit mode

  - by Mark Breen

  Hello All, Using VS2008, and Telerik radGrid version 2010.1.519.35 I have a about 50 DNN modules using telerik radgrid and I need to display my dates in dd/mm/yy format. It is possible to do this easily in view mode, but when I switch to edit mode, it is more of a struggle. I can write a snippit of code to reformat the displayed date values to dd/mm/yy, but for inserts the user must enter mm/dd/yy. IOW, I need to change the culture of the form to en-GB culture. In my DotnetNuke App, I have made a change to the web.config, but it still assumes en-US format. I am not sure whether I need to set this at web.config level, page level or at the column within the control. I am struggling with this for a month or more and any help would be appriciated, thanks Mark Breen Ireland BMW R80GS 1987

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• C# convert an IOrderedEnumerable<KeyValuePair<string, int>> into a Dictionary<string, int>

  - by Kache4

  I was following the answer to another question, and I got: // itemCounter is a Dictionary<string, int>, and I only want to keep // key/value pairs with the top maxAllowed values if (itemCounter.Count > maxAllowed) { IEnumerable<KeyValuePair<string, int>> sortedDict = from entry in itemCounter orderby entry.Value descending select entry; sortedDict = sortedDict.Take(maxAllowed); itemCounter = sortedDict.ToDictionary<string, int>(/* what do I do here? */); } Visual Studio's asking for a parameter Func<string, int> keySelector. I tried following a few semi-relevant examples I've found online and put in k => k.Key, but that gives a compiler error: 'System.Collections.Generic.IEnumerable<System.Collections.Generic.KeyValuePair<string,int>>' does not contain a definition for 'ToDictionary' and the best extension method overload 'System.Linq.Enumerable.ToDictionary<TSource,TKey>(System.Collections.Generic.IEnumerable<TSource>, System.Func<TSource,TKey>)' has some invalid arguments

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• Nested SQL Select statement fails on SQL Server 2000, ok on SQL Server 2005

  - by Jay

  Here is the query: INSERT INTO @TempTable SELECT UserID, Name, Address1 = (SELECT TOP 1 [Address] FROM (SELECT TOP 1 [Address] FROM [UserAddress] ua INNER JOIN UserAddressOrder uo ON ua.UserID = uo.UserID WHERE ua.UserID = u.UserID ORDER BY uo.AddressOrder ASC) q ORDER BY AddressOrder DESC), Address2 = (SELECT TOP 1 [Address] FROM (SELECT TOP 2 [Address] FROM [UserAddress] ua INNER JOIN UserAddressOrder uo ON ua.UserID = uo.UserID WHERE ua.UserID = u.UserID ORDER BY uo.AddressOrder ASC) q ORDER BY AddressOrder DESC) FROM User u In this scenario, users have multiple address definitions, with an integer field specifying the preferred order. "Address2" (the second preferred address) attempts to take the top two preferred addresses, order them descending, then take the top one from the result. You might say, just use a subquery which does a SELECT for the record with "2" in the Order field, but the Order values are not contiguous. How can this be rewritten to conform to SQL 2000's limitations? Very much appreciated.

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• Accessing Instance Attributes from Secondary Thread (iPhone-SDK)

  - by Travis

  I have a class with an NSDictionary attribute. Inside this class I dispatch another thread to handle NSXMLParser handling. Inside my -didStartElement, I access the dictionary in the class (to compare an element found in the XML to one in the dictionary). At this point I get undefined results. Using NSLog (I'm not advanced in XCode debugging), I see that it bombs around access of the NSDictionary. I tried just iterating the dictionary and dumping the key/values inside the didStartElement and this bombs at different keys each time. The only thing I can conclude is that something is not kosher that I'm doing with regards to accessing main thread attributes from the secondary thread. I'm somewhat new to multithreading and am not sure what the best protocol is safely access attributes from additional threads. Thanks all.

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• SqlCeException: The column cannot be modified. [ Column name = id ]

  - by pek

  I am simply trying to add a single row in the database but I keep getting an exception. I created a local database and added a single table: users. It consists of two columns: "id" and "name". I only made the id primary key (not auto-increment or anything else). When I run the following code: string execPath = Path.GetDirectoryName(Assembly.GetExecutingAssembly().GetName().CodeBase); string dbfile = execPath + @"\LocalDatabase.sdf"; SqlCeConnection conn = new SqlCeConnection("datasource=" + dbfile); conn.Open(); string command = "INSERT INTO users VALUES('1','pek')"; Debug.WriteLine(command); SqlCeCommand comm = conn.CreateCommand(); comm.CommandText = command; comm.ExecuteNonQuery(); I get the following Exception at "comm.ExecuteNonQuery();": SqlCeException was unhandled The column cannot be modified. [ Column name = id ] What's with the "modified" part?

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• Checkbox in a Microsoft Report (rdlc) table

  - by VanOrman

  I'm a newcomer to using Microsoft Reporting (RDLC) and I'm trying to display a table with a checkbox inside of it. The data I have is stored in bit fashion: I want this data to display on the report like this: I can get the data to display in a normal table without issue, but when I do, the bit values are formatted as "true" or "false". Does anyone know of a way to do this? I have googled around and found reference to other people with the same issue but no solutions. I am using a Report Viewer control to display the report in an ASP.NET website written in C#.

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• asp.net mvc Ajax.BeginForm

  - by Bala R

  Hello, I'm having some difficulties with Ajax.BeginForm I have something like this in a view <% using (Ajax.BeginForm("ActionName", null , null, new { id = "FormName" })) {%> <input type="hidden" value = '<%= Html.Encode( Model.id) %>' name="id"/> <textarea id="message" name=message rows="4" style="width: 90%"> </textarea> <% }%} And the action method is something like this [AcceptVerbs(HttpVerbs.Post)] [Authorize] public ActionResult ActionName(int id, string message) { .... } I'm trying to pass the 'id' and 'message' to the action method. I'm passing 'null' for routeValues but I dont know what to pass. Ideally I was trying to find an overload that did not require route values but took actionName and htmlattributes (for form name) but I could not find one.I don't want to add 'message' to the view-model and I do need the FormName in there for jquery operations. What is the best way to work around this problem ?

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• WPF dynamic layout: how to enforce square proportions (width equals height)?

  - by Gart

  I'm learning WPF and can't figure out how to enfore my buttons to take a square shape. Here is my XAML Markup: <Window x:Class="Example" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Height="368" Width="333"> <Window.Resources> <Style x:Key="ToggleStyle" BasedOn="{StaticResource {x:Type ToggleButton}}" TargetType="{x:Type RadioButton}"> </Style> </Window.Resources> <RadioButton Style="{StaticResource ToggleStyle}"> Very very long text </RadioButton> </Window> Specifying explicit values for Width and Height attributes seems like a wrong idea - the button should calculate its dimensions based on its contents automagically, but keep its width and height equal. Is this possible?

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• user input of one php script pass to another php without modification in first php script

  - by ish12

  hi all.. Consider two php scripts(o.php & t.php) o.php contains both html and php. html here gets user input for eg:user name and password this information is passed to php using php-self. I want the user input of o.php passed to t.php without any modification in o.php. I ve used include and require in the t.php but the problem is it displays the output of o.php but i need only the user input values from o.php without displaying the output of o.php. Using functions or session in o.php we can pass user input but am in the situation tat i should not add or modify o.php. thanks in advance!!

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• SSIS 2008 Rows per batch and Maximum insert commit size

  - by Nissan Fan

  I've got about 100 million rows that I'm moving in SSIS 2008 via a Data Flow Task. It's pretty much a straight table data copy using a Multicast. My question is this: Using the OLE DB Destination Editor I have two options: Rows per batch and Maximum insert commit size. What are good settings for this? I've only been able to find that you are recommended to set Maximum insert commit size to 2147483647 instead of 0, but then tweak both these settings based on testing. I'm curious to find out if anyone has discovered anything useful in their own management of these values.

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• jQgrid Pagination with query string

  - by bsreekanth

  Hello, I recently started experimenting with jQgrid, and much appreciate for any guidance on the below use case. I need to implement a (advanced)search functionality, and the results are loaded in the jQgrid. When use pagination, how to specify a complex query in the post data? In the serverside (grails) it it represented as an object, which is mocked below class searchCommand { String val1 List<long> ids //from the multiple selection } the above members can be null, if the user doesn't select any. Without saving the state at the server, I guess the only way to make the pagination work is to pass the query object back and forth with the correct offset, index etc. if that is the case, how best to represent it in jQgrid side. I saw a parameter postData to set additional values, but not sure how to represnt the data (JSON??). Any code snippet on (retaining) converting it from the last result to postData would be helpful. thanks in advance.

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• Set cursor position in a UITextField (Monotouch)

  - by manuel

  In a UITextView used for entering decimal numbers I would like to get rid of possible leading zeros (The behavior should be like the one of the Calculator App). Normally this would be rather easy to implement but I just cannot figure out how to restore the cursor position. UITextField has a property SelectedTextRange of type UITextRange which can be used to get the cursor position. However, there seems no easy way to get the current index nor to create a new UITextRange object that contains the new values. I could find the solution in objective c: Finding the cursor position in a UITextField It is however very unclear to me how to rewrite that in Monotouch. Any help with this would be highly appreciated. Thanks, Manuel

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• Matlab matrix replacement assignment gives error

  - by Gulcan

  Hello, when i tried to update some part of a matrix, i got the following error message: ??? Assignment has fewer non-singleton rhs dimensions than non-singleton subscripts My code tries to update some values of a matrix that represent a binary image. My code is as follows: outImage(3:5,2:4,1) = max(imBinary(3:5,2:4,1)); When I delete last parameter (1), this time I get the same error. I guess there is a mismatch between dimensions but I could not get it. outImage is a new object that is created at that time (I tried to create it before, but nothing changed). What may be wrong? Thanks in advance, Gulcan

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• MATLAB matrix replacement assignment gives error

  - by Gulcan

  I tried to update some part of a matrix, I got the following error message: ??? Assignment has fewer non-singleton rhs dimensions than non-singleton subscripts My code tries to update some values of a matrix that represent a binary image. My code is as follows: outImage(3:5,2:4,1) = max(imBinary(3:5,2:4,1)); When I delete last parameter (1), this time I get the same error. I guess there is a mismatch between dimensions but I could not get it. outImage is a new object that is created at that time (I tried to create it before, but nothing changed). What may be wrong?

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• ASP.NET MVC: Render checkbox list from MultiSelectList

  - by aximili

  How do you associate a MultiSelectList with a list of checkboxes? eg. I pass something like this to the model model.Groups = new MultiSelectList(k.Groups, "Id", "Name", selectedGroups) How should I render it? This doesn't work <% foreach (var item in Model.Groups.Items) { %> <input type="checkbox" name="groups" value="<%=item.Value%>" id="group<%=item.Value%>" checked="<%=item.Selected?"yes":"no"%>" /> <label for="group<%=item.Value%>"><%=item.Text%></label> <% } %> Error CS1061: 'object' does not contain a definition for 'Value'... Is there a HTML Helper method that I can use? (Then, unless it is straightforward, how should I then get the selected values back on the Controller when the form is submitted?)

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• WPF binding ComboBox to enum (with a twist)

  - by Carlo

  Well the problem is that I have this enum, BUT I don't want the combobox to show the values of the enum. This is the enum: public enum Mode { [Description("Display active only")] Active, [Description("Display selected only")] Selected, [Description("Display active and selected")] ActiveAndSelected } So in the ComboBox instead of displaying Active, Selected or ActiveAndSelected, I want to display the DescriptionProperty for each value of the enum. I do have an extension method called GetDescription() for the enum: public static string GetDescription(this Enum enumObj) { FieldInfo fieldInfo = enumObj.GetType().GetField(enumObj.ToString()); object[] attribArray = fieldInfo.GetCustomAttributes(false); if (attribArray.Length == 0) { return enumObj.ToString(); } else { DescriptionAttribute attrib = attribArray[0] as DescriptionAttribute; return attrib.Description; } } So is there a way I can bind the enum to the ComboBox AND show it's content with the GetDescription extension method? Thanks!

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• Spring JdbcTemplate - Insert blob and return generated key

  - by itsadok

  From the Spring JDBC documentation, I know how to insert a blob using JdbcTemplate final File blobIn = new File("spring2004.jpg"); final InputStream blobIs = new FileInputStream(blobIn); jdbcTemplate.execute( "INSERT INTO lob_table (id, a_blob) VALUES (?, ?)", new AbstractLobCreatingPreparedStatementCallback(lobhandler) { protected void setValues(PreparedStatement ps, LobCreator lobCreator) throws SQLException { ps.setLong(1, 1L); lobCreator.setBlobAsBinaryStream(ps, 2, blobIs, (int)blobIn.length()); } } ); blobIs.close(); And also how to retrieve the generated key of a newly inserted row: KeyHolder keyHolder = new GeneratedKeyHolder(); jdbcTemplate.update( new PreparedStatementCreator() { public PreparedStatement createPreparedStatement(Connection connection) throws SQLException { PreparedStatement ps = connection.prepareStatement(INSERT_SQL, new String[] {"id"}); ps.setString(1, name); return ps; } }, keyHolder); // keyHolder.getKey() now contains the generated key Is there a way I could combine the two?

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• WPF Combobox textbox not updating when binding changes.

  - by WillH

  I have a WPF CombBox as follows: <ComboBox ItemsSource="{Binding Source={StaticResource myList}}" SelectedItem="{Binding Path=mySelectedItem}" /> The problem I have is that when the bound value changes, the selected value in the combobox's textbox does not update. (Note - the values in the combobox list do update). I am using MVVM so I can detect in the view model when the binding changes and call a property changed event and this is updating the combobox, but not the value displayed within the textbox. I think this could be done in the template of the combobox - somehow make the textbox be bound to the selecteditem of the combobox, or always update when it updates? I don't know how to do this though so any advice would be most appreciated.

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• Compiled Linq & String.Contains

  - by sharru

  i'm using linq-to-sql and i'm use complied linq for better performance. I have a users table with a INT field called "LookingFor" that can have the following values.1,2,3,12,123,13,23. I wrote a query to return the users based on the "lookingFor" column i want to return all users that contains the "lookingFor" value (not only those equal to it). In example if user.LookingFor = 12 , and query paramter is 1 this user should be selected. private static Func<NeDataContext, int, IQueryable<int>> MainSearchQuery = CompiledQuery.Compile((NeDataContext db, int lookingFor) => (from u in db.Users where (lookingFor == -1 ? true : u.LookingFor.ToString().Contains(lookingFor) select u.username); This WORKS on non complied linq but throws error when using complied. How do i fix it to work using complied linq? I get this error: Only arguments that can be evaluated on the client are supported for the String.Contains method.

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• How to get the checked checkbox from a ASP.NET MVC2 form

  - by JF

  I have a hard time in asp.net MVC2 trying to get the checked values of different checkbox. Here is my view <div id="RoleSelection"> <ul> <% foreach (var roles in Model.Roles) { %> <li> <input type="checkbox" id="roles" value="<%: roles %>" /> <%: roles %> </li> <% } %> </ul> </div> My model: [LocalizedDisplayName("Role", NameResourceType = typeof(UserResources))] public string Role { get; set; } public IEnumerable<string> Roles { get; set; } So basically here I'm trying to figure out how to get all the checked checkbox from my form! Thank you

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