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  • How to select a single object using Linq in vb.net

    - by Hucker
    I have done a lot of searching to what appears to be a simple LINQ problem but I can't figure out how to do grab an object out of a collection that has a specified minimum (or max value) without resorting to a sort like this: > dim customers= GetCustomers() > > dim youngest = (From c in customers > Order By c.age Ascending).ToList.First This (untested code) structure works fine with the exception that the entire customer array must be sorted and placed into a list for the only purpose of extracting the first value. That can't be the best way to get the minimum! Note that I want the whole c record in this case, not the minumum age of a customer that can be done like this (a typical example): > dim customers= GetCustomers() > > dim youngest = (From c in customers > Select c.age).Min Or even > dim customers= GetCustomers() > > dim youngest = (From c in customers > Select c).Min(Function(x) x.age) I can't for the life of me figure out how to get the whole object (or even the index) without resorting to the sort...

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  • Delaying in VB.net

    - by Reece Tilley
    my issue is i need to wait 3-4 seconds after a button has been pressed before i can check for it, here is my code under button1_click: While Not File.Exists(LastCap) Application.DoEvents() MsgBox("testtestetstets") End While PictureBox1.Load(LastCap) I think i'm doing something really simple wrong, i'm not the best at VB as i'm just learning so any explaining would be great! ~Thanks

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  • VB.NET 2008 Application crashing during Do Loop

    - by RedHaze
    I am writing an application to compare each item on listbox1 to all items on listbox2. If the item is found, then remove it from both lists. The goal is to only have the items that were not found remain on both lists. The problem is, the application just hangs and I never get any results. I looked at my code several times and I cannot figure out what's going on (programming noob I know...). Can anybody help me with this? Code Snippet: Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click Dim a As String Dim b As String Dim y As String For i As Integer = 0 To ListBox1.Items.Count - 1 a = ListBox1.Items(i) y = 1 Do While y = 1 For x As Integer = 0 To ListBox2.Items.Count - 1 b = ListBox2.Items(x) Dim res As Int16 = String.Compare(a, b) If res = 0 Then y = 0 ListBox2.Items.Remove(i) ListBox2.Items.Remove(x) ElseIf x = ListBox1.Items.Count Then Exit Do End If Next Loop Next End Sub

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  • [NET] Reflection

    - by pipiscrew
    using : Dim a As [Assembly] = [Assembly].LoadFile("C:\test.exe") Dim testTP As Type testTP = a.GetType("SplashScreen", True, True) obj1 = Activator.CreateInstance(withoutFOR) obj1.show() my prog made reflection to test.exe SplashScreen loaded , also obj1 filled when SplashScreen disposed - MainForm loaded the obj1 isnothing! when try to access obj1 VS say : AccessibilityObject = {"Cannot access a disposed object. Object name: 'SplashScreen'."} I want always obj1 filled from the active form!! how????

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  • C# and ASP.NET MVC: Using #if directive in a view

    - by Mega Matt
    Hi all, I've got a conditional compilation symbol I'm using called "RELEASE", that I indicated in my project's properties in Visual Studio. I want some particular CSS to be applied to elements when the RELEASE symbol is defined, and I was trying to do that from the view, but it doesn't seem to be working. My view code looks like this (shortened a bit for demo purposes): <% #if (RELEASE) %> <div class="releaseBanner">Banner text here</div> <% #else %> <div class="debugBanner">Banner text here</div> <% #endif %> With this code, and with the RELEASE symbol set, the 'else' code is running and I'm getting a div with the debugBanner class. So it doesn't seem to think that RELEASE is defined. It's worth noting that my actual C# code in .cs files is recognizing RELEASE and runs the correct code. It's only the view that is giving me the problem. Does anyone have any insight into this? Any help would be appreciated. Thanks.

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  • .NET Threading : How to wait for other thread to finish some task

    - by Alex Ilyin
    Assume I have method void SomeMethod(Action callback) This method does some work in background thread and then invokes callback. The question is - how to block current thread until callback is called ? There is an example bool finished = false; SomeMethod(delegate{ finished = true; }); while(!finished) Thread.Sleep(); But I'm sure there should be better way

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  • Trying to create C++/CLI assembly for use in .NET

    - by Bad Man
    I'm trying to bring a C++ library into C#, so naturally I am trying to make a C++/CLI project. In visual studio I created a new project (Visual C++ project, class library). I then tried to make a test class out of the pre-generated "Class1" namespace Test { public ref class TestIt { public: void DoWork() { System::Console::WriteLine("sup"); } // TODO: Add your methods for this class here. }; } So I compile in and go to the build folder.... hrmm no .dll wetf?? There's a .dll.intermediate.manifest file, but no .dll. So wut I did wrong?

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  • ASP.NET MVC2 : DateTime modelbinding via HTTP GET

    - by mathieu
    I'm getting some trouble binding a date from QueryString : I have the following model public class QueryParms { public DateTime Date { get; set; } } And the following controller action : public ActionResult Search( QueryParms query ); I have a form, with a field where I can type my date. If the form is FormMethod.Post, everything is fine, my date is correctly bound to my model. If the form is FormMethod.Get, it is not working anymore. The date is left to the default value (01/01/0001) I think it is a culture issue : When i look into the value provider, the FormValueProvider has a culture property set for my date : {fr-FR}. The QueryStringValueProvider doesn't have the culture property set. Is there a way to set this property ?

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  • ASP.net: Efficient ways to convert DataSets to GenericCollection (Of ObjectType)

    - by jlrolin
    I currently have a function that gets some data from the database and puts it into a dataset. The return type on my function is GenericCollection (Of CustomerDetails) If I do this: Dim dataset As DataSet = Read(strSQL.ToString) 'Gets Data from DB What's the most efficient way to map the dataset results to an collection of objects. More importantly, since I'm using GenericCollection, is there a way to do this in which I can call a function from the ObjectType class (CustomerDetails) that would have a means to converting that specific object. Or is there a way in which I can use a function that would handle all types? Is there a way to do something like: Return returnedResults.TransformDataSet(dataset) In which returnedResults is an object collection Of CustomerDetails, or would it simply be easier to have TransformDataSet return an object collection Of CustomerDetails by itself? Thanks for any help.

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  • asp.net mvc jquery hidden field

    - by mazhar
    the thing is that I have a form with a textbox and a button and a hidden field, now what i want to do is to write something in the textbox ,pass it to the hidden field and then access that thing written in the hidden field in the controller . how can i do that?

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  • Read [for xml auto, elements] into DataTable in ADO.NET

    - by ihorko
    Hello All! I have MS SQL Server stored procedure that returns XML (it uses SELECT with for xml auto, elements) I tried read it into DataTable: DataTable retTable = new DataTable(); SqlCommand comm = new SqlCommand("exec MySP", connection); SqlDataAdapter da = new SqlDataAdapter(comm); connection.Open(); da.Fill(retTable); but retTable contains 12 rows with separated full xml thar SQL Server returns. How can I read that XML from DB into DataTable object? Thanks!

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  • .Net using Chr() to parse text

    - by Marcx
    I'm building a simple client-server chat system. The clients send data to the server and the server resends the data to all the other clients. I'm using the TcpListener and Network stream classes to send the data between the client and the server. The fields I need to send are, for example: name, text, timestamp, etc. I separate them using the ASCII character 29. I'm also using ASCII character 30 to mark the end of the streamed data. The data is encoded with UTF8.. Is this a good approach? Will I run into problems? Are there better methods? UPDATE: Probably my question was misunderstood, so I explain it better.. Suppose to have a list of data to send from client to server, and suppose to send all the data in only one stream, how do you send these data? Using a markup Using a character as a delimiter Using a fixed length for every fields

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  • Saving a modified object from ASP.NET MVC View Using Entity-Franework 4

    - by Dani
    I retrieve an object graph from DB using EF4. The context is closed as soon as the data retrieve and the data passes to the controller, and then to the view. in the view the data is modified, and then the controller gets it back. From the controller I run Repository.Update(MyEmp); and in my repository the code goes: using (var context = new mydb()) { if (myEmp.ID != 0) // Checking if it's modified or new { context.Emp.Attach(MyEmp); int result = context.SaveChanges(); return myEmp.ID; } } The problem - once attached, the object entityState goes to unchanged, and not modified, and of course - nothing is saved to the database. What am I doing wrong ?

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  • Unusual conversion error (string to integer) asp.net

    - by Phil
    I have my repeater item template: <ItemTemplate> <tr><td><%#Container.DataItem("Category")%></td></tr> </ItemTemplate> Hooked up to: s = "SQL that works ok on server" x = New SqlCommand(s, c) x.Parameters.Add("@contentid", SqlDbType.Int) x.Parameters("@contentid").Value = contentid c.Open() r = x.ExecuteReader If r.HasRows Then Linksrepeater.DataSource = r Linksrepeater.DataBind() End If c.Close() r.Close() When I run the code I get: Invalid Cast Exception was not handled by user code (Conversion from string "category" to type 'Integer' is not valid.) I'm not sure how / why it is trying to convert "Category" to integer as in the db it is a string. Can you please tell me how to avoid this error? thanks.

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  • Question about architecting asp.net mvc application ?

    - by Misnomer
    I have read little bit about architecture and also patterns in order to follow the best practices. So this is the architecture we have and I wanted to know what you think of it and any proposed changes or improvements to it - Presentation Layer - Contains all the views,controllers and any helper classes that the view requires also it containes the reference to Model Layer and Business Layer. Business Project - Contains all the business logic and validation and security helper classes that are being used by it. It contains a reference to DataAccess Layer and Model Layer. Data Access Layer - Contains the actual queries being made on the entity classes(CRUD) operations on the entity classes. It contains reference to Model Layer. Model Layer - Contains the entity framework model,DTOs,Enums.Does not really have a reference to any of the above layers. What are your thoughts on the above architecture ? The problem is that I am getting confused by reading about like say the repository pattern, domain driven design and other design patterns. The architecture we have although not that strict still is relatively alright I think and does not really muddle things but I maybe wrong. I would appreciate any help or suggestions here. Thanks !

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  • Table Adapter query Builder ASP.NET

    - by kmsony32
    I want to connect my Table adapter with the Oracle, for that I am preparing a sql query with the query builder. The query which is running fine in Oracle but makes syntax error with query builder.It shows unable to parse the query text. I am using case statement and joins within the query.

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  • ASP.NET MVC Colon in URL

    - by Joe Morgan
    I've seen that IIS has a problem with letting colons into URLs. I also saw the suggestions others offered here. With the site I'm working on, I want to be able to pass titles of movies, books, etc., into my URL, colon included, like this: mysite.com/Movie/Bob:The Return This would be consumed by my MovieController, for example, as a string and used further down the line. I realize that a colon is not ideal. Does anyone have any other suggestions? As poor as it currently is, I'm doing a find-and-replace from all colons (:) to another character, then a backwards replace when I want to consume it on the Controller end.

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  • ASP.NET MVC 2 Form Not Passing Values

    - by Wayne
    Hi, I have a strange problem happening today. I am running the latest version of the MVC V2 framework and have been having no trouble at all - I came in this morning and for some reason values aren't being passed in to actions. To clarify lets say I have something like this: <% using (Html.BeginForm("Register", "Registration", FormMethod.Post)) { %> .... <input type="submit" name="register" id="register" value="Register" /> <% } %> And in my controller I have the following: [HttpPost] public ActionResult Register(RegistrationModel model, string register) { // At this point the register string is null } This has been working fine for a while now and I have not changed anything that I can think of that would cause this to happen. Does that make sense and as anyone any idea what is going on or what I have messed up? Thanks.

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  • vb.net press/release keys

    - by Cyclone
    How can you simulate keypresses and releases? I know you can essentially hit a key with Sendkeys.SendWait, but how can your code press and hold q, for example? Any help is much appreciated! Everything I find keeps pointing me at sendkeys, which is not correct. I essentially wish to be able to call something like press("q") and release("q"). The effect would be the same as physically holding them down. Thanks for your help!

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  • ASP.NET + QueryString Encoding Problem

    - by ParagM
    I'm passing query string parameter to .aspx page with 'Ñ' character in value. But Request.QueryString returns some other box '[]' character in return. I think this request encoding issue. and I do not want to use that HttpUtility.UrlDecode and HttpUtility.UrlEncode methods. Does anyone know how to solve this?

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  • ASP.NET Radio Button State and Back Key

    - by Dave S
    When using the browser back key on a page with radio buttons and using auto-postback, the state of the buttons (checked) stays the same while other parts of the page do not. This results in a situation where button two is checked and the cached page (because of server-side logic) displays a message that button 1 is checked. What is the best way to handle this situation? The following code example exhibits this behavior: [Form:] <asp:RadioButton ID="rb1" runat="server" AutoPostBack="true" Text="Button1" OnCheckedChanged="rb_CheckedChanged" GroupName="rbgroup" Checked="true" /> <br /> <asp:RadioButton ID="rb2" runat="server" AutoPostBack="true" Text="Button2" OnCheckedChanged="rb_CheckedChanged" GroupName="rbgroup" /> <br /> <hr /> <asp:Label ID="lbl1" runat="server">Button 1</asp:Label> [Code Behind:] protected void rb_CheckedChanged(object sender, EventArgs e) { if (rb1.Checked == true) lbl1.Text = "Button 1"; else lbl1.Text = "Button 2"; }

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