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  • .NET 2.0: Invoking Methods Using Reflection And Generics Causes Exception

    - by David Derringer
    Hi all, I'm new to Stack Overflow, so forgive me. I've just started transititoning over to C# and I am stuck on a problem. I am wanting to pass a generic class in and call a method from that class. So, my code looks as such: public void UpdateRecords<T>(T sender) where T : new() //where T: new() came from Resharper { Type foo = Type.GetType(sender.GetType().ToString()); object[] userParameters = new object[2]; userParameters[0] = x; userParameters[1] = y; sender = new T(); //This was to see if I could solve my exception problem MethodInfo populateRecord = foo.GetMethod("MethodInOtherClass"); populateMethod.Invoke(sender, userParameters); } Exception thrown: "Object reference not set to an instance of an object." Again, I really apologize, as I am nearly brand new to C# and this is the first time I've ever handled reflection and generics. Thank you!

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  • Accessing Remote ASP.NET Web Services' JSON data

    - by Emon
    How can I best create a webservice method which returns JSON data that is to be consumed by an application on a different domain? The following article talks about how to set it up: http://www.codeproject.com/KB/webservices/ASPNET_JSONP.aspx I havent tried it out yet but it seems like there are a lot of steps and the ajax client has to do some extra work. My question, is there a better way to do this? Also, I dont know too much about WCF services. Would I still have to go through a lot of work to enable JSONP? Thanks in advance.

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  • Getting value from a texbox in asp.net

    - by user279521
    Hi, I have a web page which contains multiple panels (used to show and hide various textboxes) and one particular panel contains textboxes that is used to edit records. However, when I am attemtping to update the table, the txtVendorID.Text.Trim() is blank. SqlConnection con = new SqlConnection(strConn); string sqlUpdateVendor = "usp_Vendor_Update"; SqlCommand cmdUpdateVendor = new SqlCommand(sqlUpdateVendor, con); cmdUpdateVendor.CommandType = CommandType.StoredProcedure; cmdUpdateVendor.Parameters.Add(new SqlParameter("@RecID", SqlDbType.VarChar, 50)); cmdUpdateVendor.Parameters["@RecID"].Value = Request.QueryString["Rec_ID"]; cmdUpdateVendor.Parameters.Add(new SqlParameter("@empid", SqlDbType.VarChar, 11)); cmdUpdateVendor.Parameters["@empid"].Value = txtEmpIDNumber.Text.Trim(); cmdUpdateVendor.Parameters.Add(new SqlParameter("@VendorName", SqlDbType.VarChar, 100)); cmdUpdateVendor.Parameters["@VendorName"].Value = txtVendorName.Text.Trim(); Any idea why the textbox does not contain a value?

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  • The cost of finalize in .Net

    - by Jules
    (1) I've read a lot of questions about IDisposable where the answers recommend not using Finalize unless you really need to because of the process time involved. What I haven't seen is how much this cost is and how often it's paid. Every millisecond? second? hour, day etc. (2) Also, it seems to me that Finalize is handy when its not always known if an object can be disposed. For instance, the framework font class. A control can't dispose of it because it doesn't know if the font is shared. The font is usually created at design time so the user won't know to dispose it, therefore finalize kicks in to finally get rid of it when there are no references left. Is that a correct impression?

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  • Mdi Children Changed in .Net

    - by Ben
    Hi Is there a simple way of tracking the change of an Mdi's children i.e. when they are created and closed, something like an event OnMdiChildListChanged (I realise this doesn't actually exist). I am also aware that I could have a method within my Mdi that handles the creation of child forms and logs the state of them or even create an Interface that defines that a child form has a "NotifyParent" method that is then called on close of the form, but i was wondering if there was any built in events that i could plumb into? Thanks

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  • VB.NET Window Screen Capture (ALT+PRINTSCREEN)

    - by Steve Thomas
    Hi, I found that code somewhere and I find it quite useful but I would like to find a way to make it work so it capture only the given window target. Maybe with a processID or Window Name. Even if that window is not active. I do not want to make that window active but want to get a screen capture like if I was doing Alt+PrintScreen on it. Here is the code that works for full Screen Capture Private bmpScreenShot As Bitmap Private gfxScreenshot As Graphics bmpScreenShot = New Bitmap(Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height, PixelFormat.Format32bppArgb) gfxScreenshot = Graphics.FromImage(bmpScreenShot) gfxScreenshot.CopyFromScreen(Screen.PrimaryScreen.Bounds.X, Screen.PrimaryScreen.Bounds.Y, 0, 0, Screen.PrimaryScreen.Bounds.Size, CopyPixelOperation.SourceCopy) bmpScreenShot.Save(fileName, ImageFormat.Png) I use the Visual Basic 2008 Express Thank you in advance!

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  • Best Practice for creating Web Services

    - by Holograham
    To preface I am new to web development. I am looking at creating a core set of RESTful web services around a valuable document library of sorts (initial CRUD abilities). In doing so I am theoretically creating a perfectly re-usable and scalable back-end to be used by unanticipated applications in the future. My question centers around the best practice for doing this. My initial requirement has me also creating a unique front end. Would I make the front end and back end completely separate projects to enhance the re-usability. It would increase overhead. Looking at using GWT, Restlet, and JEE technology stack if this influences the setup at all.

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  • i don't know how to work with command argument in asp.net

    - by Depozitul de Chestii
    hey, i'm tryng to pass a parameter with command argument with a link button but the result i get is always "". this is in my aspx page: <% LinkButton1.CommandArgument = "abcdef"; %> <asp:LinkButton ID="LinkButton1" runat="server" OnCommand= "LinkButton1_Click"> and in my aspx.cs i have: protected void LinkButton1_Click(object sender,CommandEventArgs ee) { String id = ee.CommandName.ToString(); } the id is always "" after i press the linkbutton. would appreciate if someone could help me. thanks

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  • Unit testing a controller in ASP.NET MVC 3

    - by Abdullah Al- Mansur
    public Double Invert(Double? id) { return (Double)(id / id); } I have done this for this test but fails please can anyone help with this cos just started with unit testing /* HINT: Remember that you are passing Invert an *integer* so * the value of 1 / input is calculated using integer arithmetic. * */ //Arrange var controller = new UrlParameterController(); int input = 7; Double expected = 0.143d; Double marginOfError = 0.001d; //Act var result = controller.Invert(input); //Assert Assert.AreEqual(expected, result, marginOfError); /* NOTE This time we use a different Assert.AreEqual() method, which * checks whether or not two Double values are within a specified * distance of one another. This is a good way to deal with rounding * errors from floating point arithmetic. Without the marginOfError * parameter the assertion fails. * */

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  • Creating Reports in ASP.NET

    - by Norbs
    I have a crystal report in my application and it works fine but I want to ask if there's a way that the user can manipulate the report that he/she wants? For example, the user wants to create his/her own report. in my application, there are already reports available. They just need to click the link and it will show immediately the specific report. What if the user wants to create his/her own report? Is it possible???

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  • ASP.NET MVC ActionLink in jquery-tmpl template

    - by Justin
    I have a jquery-tmpl defined: <script id="postTemplate" type="text/x-jquery-tmpl"> <div class="div-msg-actions-inner"> @Html.ActionLink("Edit", "Edit", "Post", new { postId = "${PostId}" }, new { @class = "button" }) @Html.ActionLink("Reply", "Reply", "Post", new { topicId = "${TopicId}" }, new { @class = "button" }) </div> </script> The action link results in the "$" being encoded into "%24". Is there a way around this so the ID in my action link will get replaced correctly?

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  • how to display using asp.net mvc

    - by kumar
    I have a partial view called StudentInfo.ascx. In it I have something like this: <fieldset> <legend>Students Information</legend> <div> <label>First Name:</label> <label>Last Name:</label> </div> </fieldset> I have another partial view called Detail.ascx which will need to display this StudentInfo.ascx. I did something like this: <%= Html.RenderAction("StudentInfo"); %> Is that right?

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  • What setup in .Net would most resemble Django

    - by Mingus Rude
    At work we are inte process of starting development on a new web-based product. Before doing so we need to establish what technology stack we are going to use. For this application my preference would have been to use Django but since the development- and management-team is soo heavily rooted with Microsoft the new product will have to be based on Microsoft technologies. So my question is, what setup, with Microsoft technologies, would most resemble a django setup with its MVT-design?

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  • ASP.Net MVC - bulk / batch insert with through controller

    - by user610358
    guys, I need to make a view which will support bulk insert. In my mvc app, I am using repository patern with entity framework for. I am only having problem on how I will going to retrive the values of the model. There will be multiple model inpouts inside the view. I am sure that I am going to use foreach or for loop but how I am going to retrive the input values form view into controller. any help would be appreciated. thanks.

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  • Downloading files in ASP.Net MVC web applications

    - by kingrichard2005
    Hello, I'm working on a project that requires the ability to let a user download a pdf from a static location on the server. I'm reading the instructions from this website, it's an old post and I notice they specify in an update that Microsoft's MVC framework has long since included and Action Result that allows the same functionality they discuss thus rendering it obsolete, I've looked a bit online but haven't been able to find any resources that discuss this built-in functionality. If anyone has any links or other information that discuss this it would be very helpful. Thanks.

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  • How do you pass a generic delegate argument to a method in .NET 2.0

    - by Seth Spearman
    Hello, I have a class with a delegate declaration as follows... Public Class MyClass Public Delegate Function Getter(Of TResult)() As TResult 'the following code works. Public Shared Sub MyMethod(ByVal g As Getter(Of Boolean)) 'do stuff End Sub End Class However, I do not want to explicitly type the Getter delegate in the Method call. Why can I not declare the parameter as follows... ... (ByVal g As Getter(Of TResult)) Is there a way to do it? My end goal was to be able to set a delegate for property setters and getters in the called class. But my reading indicates you can't do that. So I put setter and getter methods in that class and then I want the calling class to set the delegate argument and then invoke. Is there a best practice for doing this. I realize in the above example that I can set set the delegate variable from the calling class...but I am trying to create a singleton with tight encapsulation. For the record, I can't use any of the new delegate types declared in .net35. Answers in C# are welcome. Any thoughts? Seth

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  • ASP.net web page still displaying cached versions

    - by user279521
    My web page is still displaying a previously cached versions of the page. I have this in the page_load event: Response.Clear(); Response.Buffer = true; Response.ExpiresAbsolute = DateTime.Now.AddDays(-1d); Response.Expires = -1; Response.CacheControl = "no-cache"; Response.Cache.SetCacheability(HttpCacheability.NoCache); I have this in the Page_Init: protected void Page_Init(object Sender, EventArgs e) { Response.Cache.SetCacheability(HttpCacheability.NoCache); Response.Cache.SetExpires(DateTime.Now.AddDays(-1)); } Any idea what I might be missing?

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  • Need help regarding query string in asp.net

    - by vaibhav
    I have a page create-quote.aspx. I want to open this page in different modes, depending on whether a querystring parameter is present or not. My question is at which event should I check, If I have a querystring parameter or not. I think, it should be preinit, what do you say.

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  • asp.net viewdata

    - by mazhar
    public ActionResult AddDinner() { Dinner dinner = dinnerRepository.GetDinner(id); ViewData["dinner"] = repository.AllDinners(); return View(dinner); } 1) First of all both the dinner object and the ViewData["dinner"] is passing to the view? 2) Secondly how would I iterate over the ViewData["dinner"] in the view?

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