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  • How to prevent DOS attacks using image resizing in an ASP.NET application?

    - by Waleed Eissa
    I'm currently developing a site where users can upload images to use as avatars, I know this makes me sound a little paranoid but I was wondering what if a malicious user uploads an image with incredibly large dimensions that will eat the server memory (as a DOS attack), I already have a limit on the file size that can be uploaded (250 k) but even that size can allow for an image with incredibly large dimensions if the image for example is a JPEG that contains one color and created with a very low quality setting. Taking into consideration that the image is uploaded as a bitmap in memory when being resized (ie. not compressed), I wonder if such DOS attacks occur, even to check the image dimensions it has to be uploaded in memory first, did you hear about any attacks that exploited this? Am I too worried?

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  • How to set an array to a list of values in VB.NET?

    - by IPX Ares
    I cannot figure out how to set an array to one of two sets of numbers (there will be more later), every way that I have tried throws some kind of error. I have tried to Dim the array inside the case statements, but then I cannot use the array in the For Each, which makes this worthless.... any ideas would be appreciated. Code: Dim HourArray() As Integer Select Case CurrentShapeRow(ROW_PERIOD) Case "ON", "2X16" HourArray = {6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21} Case "2X8", "5X8" HourArray = {0, 1, 2, 3, 4, 5, 22, 23} Case Else Throw New Exception(String.Format("Unhandled Period: {0}", CurrentShapeRow(ROW_PERIOD))) End Select For Each HourCount As Integer In HourArray() 'DO SOME STUFF HERE Next

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  • ASP.Net MVC Where do you convert from Entities to ViewModels?

    - by Pino
    Title pretty much explains it all, its the last thing I'm trying to work into our project. We are structured with a Service Library which contains a function like so. /// <summary> /// Returns a single category based on the specified ID. /// </summary> public Category GetCategory(int CategoryID) { var RetVal = _session.Single<Category>(x => x.ID == CategoryID); return RetVal; } Now Category is a Entity (We are using Entity Framework) we need to convert that to a CategoryViewModel. Now, how would people structure this? Would you make sure the service function returned a CategoryViewModel? Have the controller pull the data from the service then call another function to covnert to a view model?

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  • how do i call an overloaded action in .net mvc?

    - by Jeff Martin
    I have an overloaded action in my Controller: public ActionResult AssignList(int id) { ... } [AcceptVerbs((HttpVerbs.Get))] public ActionResult AssignList(int id, bool altList) { ... } I'd like to use the same partial view for both lists but it will potentially have a differently filtered list of Images. I am trying to call it from another view using RenderAction: <% Html.RenderAction("AssignList", "Image", new { id = Model.PotholeId, altList = true }); %> However I am getting the following error: The current request for action 'AssignList' on controller type 'ImageController' is ambiguous between the following action methods: System.Web.Mvc.ActionResult AssignList(Int32) on type UsiWeb.Controllers.ImageController System.Web.Mvc.ActionResult AssignList(Int32, Boolean) on type UsiWeb.Controllers.ImageController How can I call the specific overload?

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  • My ASP.NET Accordion will not animate panel changes when triggered by check boxes.

    - by CowKingDeluxe
    My accordion panel in markup: <ajaxToolkit:Accordion ID="MyAccordion" runat="server" SelectedIndex="0" HeaderCssClass="accordionHeader" HeaderSelectedCssClass="accordionHeaderSelected" ContentCssClass="accordionContent" AutoSize="None" FadeTransitions="true" TransitionDuration="250" FramesPerSecond="40" RequireOpenedPane="false" SuppressHeaderPostbacks="true"> <Panes> <ajaxToolkit:AccordionPane ID="AccordionPane10" runat="server"> <Header>BBBBBBBBBB</Header> <Content> FFFFFFFF:<br /><br /> <table cellpadding="0" cellspacing="0" width="750"><tr><td width="450" class="verificationtdleft"> <asp:Image ID="step4_originalimage" runat="server" AlternateText="" /> </td><td width="300"> <asp:CheckBox ID="CB_Verification0" runat="server" AutoPostBack="true" /> Verify </td></tr> </table> </Content> </ajaxToolkit:AccordionPane> <ajaxToolkit:AccordionPane ID="AccordionPane11" runat="server"> <Header>GGGGGGGGG</Header> <Content> HHHHHHHHHH:<br /><br /> <table cellpadding="0" cellspacing="0" width="750"><tr><td width="450" class="verificationtdleft"> <asp:Image ID="step4_image_thumbnail" runat="server" AlternateText="" /> </td><td width="300"> <asp:CheckBox ID="CB_Verification1" runat="server" AutoPostBack="true" /> Verify </td></tr> </table> </Content> </ajaxToolkit:AccordionPane> </Panes> Here's how I handle the checkbox check: Private Sub CB_Verification0_CheckedChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles CB_Verification0.CheckedChanged MyAccordion.SelectedIndex = 1 End Sub I'm causing the panels to change correctly, it's just that they don't animate like they do when I click the headers. When I click the checkbox to change the panel, the panel just disappears instantly and the new one appears instantly, but I want it to be animated as if I clicked the headers. Is there a way to cause the animation to happen when force changing the visible panel?

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  • How to handle Oracle Stored Proc with ASP.NET and Oracle Data Provider?

    - by Matt
    I have been struggling with this for quite some time having been accustomed to SQL Server. I have the following code and I have verified that the OracleDbType's are correct and have verified that the actual values being passed to the parameters match. I think my problem may rest with the return value. All it does is give me the row count. I read somewhere that the return parameter must be set at the top. The specific error I am getting says, PLS-00306: wrong number or types of arguments in call to \u0027INSERT_REC\u0027 ORA-06550: line 1, column 7:\nPL/SQL: Statement ignored The stored procedure is: PROCEDURE INSERT_REC ( A_MILL_CENTER IN GRO_OWNER.MOVEMENT.MILL_CENTER%TYPE, --# VARCHAR2(10) A_INGREDIENT_CODE IN GRO_OWNER.MOVEMENT.INGREDIENT_CODE%TYPE, --# VARCHAR2(50) A_FEED_CODE IN GRO_OWNER.MOVEMENT.FEED_CODE%TYPE, --# VARCHAR2(30) --# A_MOVEMENT_TYPE should be ‘RECEIPT’ for ingredient receipts A_MOVEMENT_TYPE IN GRO_OWNER.MOVEMENT.MOVEMENT_TYPE%TYPE, --# VARCHAR2(10) A_MOVEMENT_DATE IN VARCHAR2, --# VARCHAR2(10) A_MOVEMENT_QTY IN GRO_OWNER.MOVEMENT.MOVEMENT_QTY%TYPE, --# NUMBER(12,4) --# A_INVENTORY_TYPE should be ‘INGREDIENT’ or ‘FINISHED’ A_INVENTORY_TYPE IN GRO_OWNER.MOVEMENT.INVENTORY_TYPE%TYPE, --# VARCHAR2(10) A_CREATE_USERID IN GRO_OWNER.MOVEMENT.CREATE_USERID%TYPE, --# VARCHAR2(20) A_RETURN_VALUE OUT NUMBER --# NUMBER(10,0) ); My code is as follows: //3 items hardcoded for now string millCenter = "0010260510"; string movementType = "RECEIPT"; string feedCode = "test this"; string userID = "GRIMMETTM"; string inventoryType = "INGREDIENT"; //set to FINISHED for feed stuff string movementDate = theData[i]; string ingCode = System.Text.RegularExpressions.Regex.Match(theData[i + 1], @"^([0-9]*)").ToString(); //int pounds = Convert.ToInt32(theData[i + 2].Replace(",", "")); int pounds = 100; //setup parameters OracleParameter p9 = new OracleParameter("A_RETURN_VALUE", OracleDbType.Int32, 30); p9.Direction = ParameterDirection.ReturnValue; oraCmd.Parameters.Add(p9); OracleParameter p1 = new OracleParameter("A_MILL_CENTER", OracleDbType.Varchar2, 10); p1.Direction = ParameterDirection.Input; p1.Value = millCenter; oraCmd.Parameters.Add(p1); OracleParameter p2 = new OracleParameter("A_INGREDIENT_CODE", OracleDbType.Varchar2, 50); p2.Direction = ParameterDirection.Input; p2.Value = ingCode; oraCmd.Parameters.Add(p2); OracleParameter p3 = new OracleParameter("A_FEED_CODE", OracleDbType.Varchar2, 30); p3.Direction = ParameterDirection.Input; p3.Value = feedCode; oraCmd.Parameters.Add(p3); OracleParameter p4 = new OracleParameter("A_MOVEMENT_TYPE", OracleDbType.Varchar2, 10); p4.Direction = ParameterDirection.Input; p4.Value = movementType; oraCmd.Parameters.Add(p4); OracleParameter p5 = new OracleParameter("A_MOVEMENT_DATE", OracleDbType.Varchar2, 10); p5.Direction = ParameterDirection.Input; p5.Value = movementDate; oraCmd.Parameters.Add(p5); OracleParameter p6 = new OracleParameter("A_MOVEMENT_QTY", OracleDbType.Int32, 12); p6.Direction = ParameterDirection.Input; p6.Value = pounds; oraCmd.Parameters.Add(p6); OracleParameter p7 = new OracleParameter("A_INVENTORY_TYPE", OracleDbType.Varchar2, 10); p7.Direction = ParameterDirection.Input; p7.Value = inventoryType; oraCmd.Parameters.Add(p7); OracleParameter p8 = new OracleParameter("A_CREATE_USERID", OracleDbType.Varchar2, 20); p8.Direction = ParameterDirection.Input; p8.Value = userID; oraCmd.Parameters.Add(p8); //open and execute oraConn.Open(); oraCmd.ExecuteNonQuery(); oraConn.Close();

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  • ASP.NET MVC: Is it "wrong" to use HTTP 500 via an AJAX request to return invalid form content?

    - by Daniel Schaffer
    Here's the situation: I've got two partial views. One has a form. What needs to happen is when the form is posted via an AJAX request, if the operation succeeds, the area with the second partial is repopulated with the content. However, if the posted data was invalid, the original partial is repopulated with an error message. I'm using jQuery and the ajaxForm plugin to handle the form posts and responses. Would it be "wrong"/bad coding/wtf-worthy to conditionally use $.html() to replace the content in one area when it's a 200, and a different area if it's a 500? To me, this idea smells, but I'm not sure how else to accomplish the goal.

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  • Strategy in exporting to Excel with formatting from ASP.NET?

    - by Jiho Han
    So this is another exporting to Excel question. I have a page that has a table with formatting by stylesheet. When I export the page by setting the ContentType to application/excel and Content-Disposition to attachment, I can export the table to Excel (not CSV). However, it loses all formatting. I think it's because Excel does not load CSS and I guess that's reasonable. So, in a scenario where I have to show the table on the web and also export to Excel, both with similar (even if not exact) formatting, what would be the best approach without using something like NPOI? I am trying to minimize the work and keep the single template if possible. Is it necessary for me to create two separate templates: one with stylesheet, the other with embedded style in the table itself for Excel? Having a single template with conditional formatting inside would be very messy. Any ideas?

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  • Applying a Dojo Toolkit (Dijit) theme to ASP.NET pages.

    - by mcoolbeth
    In the code below, I am trying to apply a Dijit theme to the controls in my .aspx page. However, the controls persist in their normal, unthemed appearance. Anybody know why? Master Page: <%@ Master Language="C#" AutoEventWireup="true" CodeBehind="Main.master.cs" Inherits="WebJournalEntryClient.Main" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" > <head runat="server"> <title>My Web Application</title> <link rel="stylesheet" href="dojoroot/dijit/themes/tundra/tundra.css" /> <script type="text/javascript" src="dojoroot/dojo/dojo.js"/> <script type="text/javascript"> dojo.require("dijit.form.Button"); dojo.require("dijit.form.TextBox"); dojo.require("dijit.form.ComboBox"); </script> </head> <body class = "tundra"> <form id="form1" runat="server"> <div> <div> This is potentially space for a header bar. </div> <table> <tr> <td> Maybe <br /> a <br /> Side <br /> bar. </td> <td> <asp:ContentPlaceHolder ID="CenterPlaceHolder" runat="server"/> </td> </tr> </table> <div> This is potentially space for a footer bar. </div> </div> </form> </body> </html> Content Page: <%@ Page Title="" Language="C#" MasterPageFile="~/Main.Master" AutoEventWireup="true" CodeBehind="LogIn.aspx.cs" Inherits="WebJournalEntryClient.LogIn" %> <asp:Content ID="Content" ContentPlaceHolderID="CenterPlaceHolder" runat="server"> <div> User ID: <asp:TextBox ID = "UserName" dojoType="dijit.form.TextBox" runat="server" /><br /> Password: <asp:TextBox ID = "PassWord" dojoType="dijit.form.TextBox" runat="server" /><br /> <asp:Button ID="LogInButton" Text="Log In" dojoType="dijit.form.Button" runat="server" /> </div> </asp:Content>

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  • Custom ASP.NET MVC cache controllers in a shared hosting environment?

    - by Daniel Crenna
    I'm using custom controllers that cache static resources (CSS, JS, etc.) and images. I'm currently working with a hosting provider that has set me up under a full trust profile. Despite being in full trust, my controllers fail because the caching strategy relies on the File class to directly open a resource file prior to treatment and storage in memory. Is this something that would likely occur in all full trust shared hosting environments or is this specific to my host? The static files live within my application's structure and not in an arbitrary server path. It seems to me that custom caching would require code to access the file directly, and am hoping someone else has dealt with this issue.

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  • How can I programmatically obtain the company info used to digitally sign an assembly in .NET?

    - by chaiguy
    As a means of simple security, I was previously checking the digital signature of a downloaded update package for my program against its public key to ensure that it originated from me. However, as I'm using cheap code signing certs (Tucows), I am unable to renew an existing cert and therefore the keys change every time I need to renew. Therefore, a more reliable means would be to verify the organization information embedded in the signed assembly (which is displayed in the UAC dialog) against my well-known organization string, as this will continue to be the same. Does anyone know how to obtain this information from a digitally-signed assembly?

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  • How best to use XPath with very large XML files in .NET?

    - by glenatron
    I need to do some processing on fairly large XML files ( large here being potentially upwards of a gigabyte ) in C# including performing some complex xpath queries. The problem I have is that the standard way I would normally do this through the System.XML libraries likes to load the whole file into memory before it does anything with it, which can cause memory problems with files of this size. I don't need to be updating the files at all just reading them and querying the data contained in them. Some of the XPath queries are quite involved and go across several levels of parent-child type relationship - I'm not sure whether this will affect the ability to use a stream reader rather than loading the data into memory as a block. One way I can see of making it work is to perform the simple analysis using a stream-based approach and perhaps wrapping the XPath statements into XSLT transformations that I could run across the files afterward, although it seems a little convoluted. Alternately I know that there are some elements that the XPath queries will not run across, so I guess I could break the document up into a series of smaller fragments based on it's original tree structure, which could perhaps be small enough to process in memory without causing too much havoc. I've tried to explain my objective here so if I'm barking up totally the wrong tree in terms of general approach I'm sure you folks can set me right...

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  • How to create Data Entry User Interfaces in asp.net?

    - by Wael Dalloul
    Suppose that you have a big Data Entry Web Application Like Microsoft CRM, what is the strategies and technologies that you follow to build a website like it? I don't want to use any Dynamic Web Page Generation software, because it have a lot of limitations.. Also I don't want to design every page and repeat everything what's the best approach? Any Ideas or Head lines on this issue? Thanks in Advance...

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  • Why would the VB.NET compiler think an interface isn't implemented when it is?

    - by Dan Tao
    I have this happen sometimes, particularly with the INotifyPropertyChanged interface in my experience but I have no idea if the problem is limited to that single interface (which would seem bizarre) or not. Let's say I have some code set up like this. There's an interface with a single event. A class implements that interface. It includes the event. Public Interface INotifyPropertyChanged Event PropertyChanged As PropertyChangedEventHandler End Interface Public Class Person Implements INotifyPropertyChanged Public Event PropertyChanged _ (ByVal sender As Object, ByVal e As PropertyChangedEventArgs) _ Implements INotifyPropertyChanged.PropertyChanged ' more code below ' End Class Every now and then, when I build my project, the compiler will suddenly start acting like the above code is broken. It will report that the Person class does not implement INotifyPropertyChanged because it doesn't have a PropertyChanged event; or it will say the PropertyChanged event can't implement INotifyPropertyChanged.PropertyChanged because their signatures don't match. This is weird enough as it is, but here's the weirdest part: if I just cut out the line starting with Event PropertyChanged and then paste it back in, the error goes away. The project builds. Does anybody have any clue what could be going on here?

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  • how to add folder to a listbox in .net?

    - by shruti
    i have a list box and i want to add a folder/directory to that which is at the specified location i have used the code string path = "E:\\shruti\\MyDir"; DirectoryItem folder = new DirectoryItem(path); lstBurnItems.Items.Add(folder); //add folder to listbox but its not working fine... what should i do to get success??

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  • Is there any way, short of "copy and paste inheritence" to share a .net class with a Silverlight app

    - by Jekke
    I have a project in two parts: a Silverlight front end and a WCF duplex service. Ideally, I would like to pass a message of a custom type (call it TradeOffer) from the WCF service to be consumed by the Silverlight application. When I try to, I get an error that indicates I can't pass an object of an unknown type across the wire like that and that, maybe, I could do so if I used the InternalsVisibleTo attribute on the server component. I'm not sure if that would work in this environment and know it would be messy in development. I originally put the message definition in a library to be used by both the service and the client, but couldn't add a reference to the library from the Silverlight client (because it's not a Silverlight assembly.) Is there some way I can access the definition of a message class from both the Silverlight client that consumes it and the service that publishes it without using the InternalsVisibleTo attribute or should I write the application another way?

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  • How to display a picture stored in database in the ASP.NET DetailsView?

    - by Alex
    Hi, I'm having a problem of displaying a picture in the DetailsView..what is the way to bind it with the DetailsView?My picture is retrieved from database and put with other needed information in a dataset..how can i extract it from dataset and bind with a particular field of DetailsView in order to display it? I would really appreciate any help Thanks

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  • how to solve this Problem in asp.net crystal report.

    - by Ayyappan.Anbalagan
    Problem in crystal report After excecuting the bellow code,In my report page it ask like "The report you requested requires further information" server= user= password= databse= protected void Page_Load(object sender, EventArgs e) { MySqlConnection sqlcom = new MySqlConnection("server=localhost;userid=root;password=root;database=hemaepdb;"); MySqlCommand cmd = new MySqlCommand("SP_ViewBillDetails", sqlcom); cmd.CommandType = CommandType.StoredProcedure; cmd.Parameters.Add("p_Invoice_Id", MySqlDbType.Int16).Value = 1; cmd.Parameters.Add("p_Org_id", MySqlDbType.Int16).Value = 1; MySqlDataAdapter adapter = new MySqlDataAdapter(cmd); DataSet dsTest = new DataSet(); sqlcom.Open(); adapter.Fill(dsTest, "Table"); sqlcom.Close(); CrystalReportViewer1.Visible = true; ReportDocument myRpt = new ReportDocument(); myRpt.Load(Server.MapPath("CrystalReport.rpt")); myRpt.SetDatabaseLogon("root", "root", "localhost", "hemaepdb"); myRpt.SetDataSource(dsTest); CrystalReportViewer1.ReportSource = myRpt; }

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