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  • ado.net data entity problem

    - by ognjenb
    I have this error Cannot implicitly convert type 'System.Linq.IQueryable' to 'Mvc.Models.engineer'. An explicit conversion exists (are you missing a cast?) after write this code engineer Ing = new engineer(); Ing = from j in testPersons.ibekoengineer select j.Name; What is wrong?

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  • Deserialising Json to derived types in Asp.Net Web API

    - by IoChaos
    I'm calling a method of my WebAPI sending a json that I would like to match (or bind) with a model. In the controller I have a method like: public Result Post([ModelBinder(typeof(CustomModelBinder))]MyClass model); 'MyClass', wich is given as a parameter is an abstract class. I would like that at, depending of the type of json passed, the correct inherited class is instantiated. To achieve it, I'm trying to implement a custom binder. The problem is that (I don't know if it's very basic but I can't find anything) I don't know how to retrieve the raw Json (or better, some kind of serialization) that comes in the request. I see: actionContext.Request.Content But all methods are exposed as async. I don't know who this fits with passing the generate model to the controller method... Thanks a lot!

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  • VB.NET Update Access Database with DataTable

    - by sinDizzy
    I've been perusing some hep forums and some help books but cant seem to get my head wrapped around this. My task is to read data from two text files and then load that data into an existing MS Access 2007 database. So here is what i'm trying to do: Read data from first text file and for every line of data add data to a DataTable using CarID as my unique field. Read data from second text file and look for existing CarID in DataTable if exists update that row. If it doesnt exist add a new row. once im done push the contents of the DataTable to the database. What i have so far: Dim sSQL As String = "SELECT * FROM tblCars" Dim da As New OleDb.OleDbDataAdapter(sSQL, conn) Dim ds As New DataSet da.Fill(ds, "CarData") Dim cb As New OleDb.OleDbCommandBuilder(da) 'loop read a line of text and parse it out. gets dd, dc, and carId 'create a new empty row Dim dsNewRow As DataRow = ds.Tables("CarData").NewRow() 'update the new row with fresh data dsNewRow.Item("DriveDate") = dd dsNewRow.Item("DCode") = dc dsNewRow.Item("CarNum") = carID 'about 15 more fields 'add the filled row to the DataSet table ds.Tables("CarData").Rows.Add(dsNewRow) 'end loop 'update the database with the new rows da.Update(ds, "CarData") Questions: In constructing my table i use "SELECT * FROM tblCars" but what if that table has millions of records already. Is that not a waste of resources? Should i be trying something different if i want to update with new records? Once Im done with the first text file i then go to my next text file. Whats the best approach here: To First look for an existing record based on CarNum or to create a second table and then merge the two at the end? Finally when the DataTable is done being populated and im pushing it to the database i want to make sure that if records already exist with three primary fields (DriveDate, DCode, and CarNum) that they get updated with new fields and if it doesn't exist then those records get appended. Is that possible with my process? tia AGP

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  • ASP.NET MVC Inheriting from ProfileBase

    - by Glen
    I have 2 related issues. I inherited from ProfileBase and I have a couple of properites as such public SomeType PropertyName { get { return (SomeType)base["PropertyName"]; } set { base["PropertyName"] = value; Save(); } } I also have a User class (UserId, UserName, Profile, LastActivityDate) that has 2 additional properties out of the profile that I retrieve in my View to show a list of Users (i.e. @Model.Profile.PropertyName). However, everytime I access a property (from my View) it seems to update the LastActivityDate in the aspnet_Users table because when I show the LastActivityDate as well as the profile properties on my screen the LastActivtyDate is out of sync with the database. Also there is a LastActivityDate property available in my profile which unfortunately is not available and is in fact set to null and throws an exception when accessing it saying the property UserName is null. So the static Create method provided by ProfileBase seems to retrieve the correct profile properties but does not set the base's UserName property even though you pass in a UserName parameter to the Create method. Is this a internal bug? I was kind of hoping if by accessing the property because the LastActivityDate is updated then I could store that value to update my LastActivityDate in my User class before it is rendered to the page. The only way I can think of doing it is: public SomeType PropertyName { get { SomeType result = (SomeType)base["PropertyName"]; OnLastActivityDateChanged(); return result; } set { base["PropertyName"] = value; } } then in my User class: ... public MyProfile() { Profile.LastActivityDateChanged += Profile_LastActivityDateChanged(); } ~MyProfile() { Profile.LastActivityDateChanged -= Profile_LastActivityDateChanged(); } ... void Profile_LastActivityDateChanged(object sender, EventArgs e) { //Run a query to get the latest LastActivityDate this.LastActivityDate = ... } It seems I have to make 1 call to retrieve the full list to my aspnet_Users table then another call for each row just to get the latest activity date. ARGGGGHHH!!! Am I going about this the wrong way! I put an ajax refresh hyperlink next to each User row and when I click it, immediately after loading the page, the value changes. Therefore my suspision is valid that calling a property via the inherited profilebase class updates the value. Is there a workaround? It is a bit miss leading when my page says User Smith has no activity for 4 days then I click my ajax refresh link (or refresh the whole page for that matter) and now it says Smith was active but it was just me meally showing the page that indirectly caused an activity read event.

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  • ASP.NET MVC - Appending data onto a file download

    - by aschepis
    what is the best way to append data onto a file download? I figure that i can make my own class that implements InputStream and just consolidates two input streams (the file first, my additional data to append second.) but is there an existing view class that i can use to just return an InputStream or will i have to roll my own view class as well?

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  • ASP.NET - How to edit 'bit' data type?

    - by Peter
    I am coding in Visual Basic. I am using a checkbox control. Now depending on its checked property I need to set/unset a bit column in a SQL Server database. Here's the code: Try conSQL.Open() Dim cmd As New SqlCommand("update Student set send_mail = " + _ sendemailCheckBox.Checked.ToString + " where student_id = '" _ + sidnolabel.Text + "'", conSQL) cmd.ExecuteNonQuery() Finally conSQL.Close() End Try The send_mail attribute is of bit datatype. This code is not working. How do I go about it?

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  • Update query in ado.net

    - by nikhil
    I wanted to update a column in my table, i have written the code it runs fine without any error also it displays the confirmation dialog box but the table is not updated whats wrong with the code. Dim sqlConn As New SqlClient.SqlConnection sqlConn.ConnectionString = "Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\housingsociety.mdf;Integrated Security=True;Connect Timeout=30;User Instance=True" Try sqlConn.Open() Catch sqlError As Exception MsgBox(sqlError.Message, 0, "Connection Error!") End Try Dim sqlComm As New SqlClient.SqlCommand sqlComm.Connection = sqlConn sqlComm.CommandText = "update committe_member set name = '@name' where name = 'member1'" Dim paramString As New SqlClient.SqlParameter("@name", SqlDbType.VarChar, 50) paramString.Direction = ParameterDirection.Input sqlComm.Parameters.Add(paramString) paramString.Value = TextBox1.Text sqlComm.ExecuteNonQuery() MsgBox("Record Sucessfully Altered", 0, "Confirmation!") sqlConn.Close()

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  • Best .NET Solution for Frequently Changed Database

    - by sestocker
    I am currently architecting a small CRUD applicaton. Their database is a huge mess and will be changing frequently over the course of the next 6 months to a year. What would you recommend for my data layer: 1) ORM (if so, which one?) 2) Linq2Sql 3) Stored Procedures 4) Parametrized Queries I really need a solution that will be dynamic enough (both fast and easy) where I can replace tables and add/delete columns frequently. Note: I do not have much experience with ORM (only a little SubSonic) and generally tend to use stored procedures so maybe that would be the way to go. I would love to learn Ling2Sql or NHibernate if either would allow for the situation I've described above.

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  • connecting to oracle database from c# asp.net mvc website

    - by ooo
    I am trying to connect to oracle database. I am able to connect to it through a local SQL Developer tool by sticking something in the oranames.tns file. My question is that i will be deploying this website to a number of places. A few questions: What is the simplest way i can use to connect to this database and do very basic queries. I see some examples that have me referencing oracleclient dlls. Other methods not? Is there a best practice here? Am i going to have to update the oranames.tns file on everyone on of the machines that i deploy to ? is there any simpler way

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  • Why Isn't My .Net Object Serializable?

    - by Rob P.
    I've got a 'MyDataTable' class that inherits from System.Data.DataTable I've implemented ISerializable in my class and have a 'Public Overrides Sub GetObjectData...' But when I try to serialize the an object of 'MyDataTable' I get an error saying that 'MyDataTable' is not marked as serializable. If I used a DataTable instead - my code serializes correctly. If I add a serializable attribute to the 'MyDataTable' class - it serializes correctly, but I'm told that is unnecessary if I implement ISerializable. Can someone point me in the right direction?

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  • Problem using GDI+ with multiple threads (VB.NET)

    - by Joe B
    I think it would be best if I just copy and pasted the code (it's very trivial). Private Sub Main() Handles MyBase.Shown timer.Interval = 10 timer.Enabled = True End Sub Private Sub Form1_Paint(ByVal sender As System.Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles MyBase.Paint e.Graphics.DrawImage(image, 0, 0) End Sub Private Sub tick() Handles timer.Elapsed Using g = Graphics.FromImage(image) g.Clear(Color.Transparent) g.DrawLine(Pens.Red, 0 + i, 0 + i, Me.Width - i, Me.Height - i) End Using Me.Invalidate() End Sub An exception, "The object is currently in use elsewhere", is raised during the tick event. Could someone tell me why this happens and how to solve it? Thanks.

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  • update database problem with asp.net mvc 2

    - by ognjenb
    [AcceptVerbs(HttpVerbs.Post)] public ActionResult Numbers(int id, int val, int name) { int temp = val % 2; brojevi br = new brojevi(); if (temp == 1 && name == 1) { var nmb = (from n in numbers.brojevi where n.prvi_br == id select n).First(); br.prvi_br = nmb.prvi_br - 1; numbers.SaveChanges(); } var nm = from n in numbers.brojevi select n; return View(nm); } Data table brojevi have 3 fields but I have to change(update) only one of them (prvi_br). Why my solutions doesn't save changes to database

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  • How to acheieve this kind of behaviour in asp.net mvc

    - by kumar
    Hello Friends,, I have this two Action result methods. public ActionResult GetStudentInfo(StudentBE s) { return PartialView("editStudent", s); } public ActionResult GenericList() { StudentBE codes = new StudentBE(); codes.lookcodes= GetStudentCodes(new string[] { "A", "B", "C, "D", "E" }); return PartialView(codes); } // Lookcodes display dropdownlist boxes in the GeneridList view.. In genericList view I hvae beginForm.. <% using (Html.BeginForm("Updatestudent", "expense", FormMethod.Post, new { @id = "id" })) { %> <% } %> so My updatestudent method is [HttpPost] public JsonResult Updatestudent(StudentBE e) { var status = common.Update(e.student); } } return Json(status.ToString()); } Here is my problem.. the GetStudentInfo Actionresult is having each student information.. in UpdateStudent method Update Method calls the DB calls for stored procedure to update each user information now to update each user I need to call GetstudentInfo each time to get student information to update..? how to call GetStudentInfo method here to get studentinformation? student informatin may be multiple that is more than one student informaton... can anybody help me out.. thanks

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  • A cross-platform application WPF, ASP.NET, Silverlight, WP7, XAML

    - by J. Lennon
    Considering the fact that all applications will interact with the web project (which will use the cloud or web services).. Is there any way to share my class models between applications? If yes, what is the best way to do it? About sending / receiving data from the Webservice, serialize and deserialize, how can I do this in a simple way without having to manually populate the objects? Any information about this applications would be really helpful!

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  • how to remove IEnemurable in asp.net mvc

    - by kumar
    I have a view with <%@ Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl<IEnumerable<StudentInfo>>" %> in my view if i have IEnumerable I can do foreach.. but before that i need to access the properties for StudnetInfo.. StudentInfo clas having Public class StudentInfo { public Studentdetails sd {get;set;} public classDetails cd {get;set;} } <% foreach(var e in Model){%> <div> <%=Html.DisplayFor(x=>e.StdentEdit) %> <div> <span> <% Html.RenderAction("Details", "Home", new { @t = e }); %> </span> </div> </div> <% } %> please can anybody help me out.. how to get the properties of StudentInfo above the foreach loop... if i remove IEnemurable I can do that.. but i need to have Ienemurable for RenderAction.. is there any other way we can achieve this? thanks

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  • ASP.NET MVC 2 model properties binding order

    - by bniwredyc
    Is there a way to change order in which the default binder binds property values of model? For example I have model class A: class A { public string A1 {get; set;} public string A2 {get; set;} } and action DoSomethig: public ActionResult DoSomething(A model) { ... } I want that A2 property has been bound before the A1 property. Is it possible? Or I need to write custom binder?

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  • Asp.net mvc html melper

    - by tom
    Hi there Ive got this function as a html helper which should write a javascript function onto the page, I then call this in the masterpage like this <%Html.RenderBaseUrlScript(); % My problem is that the script never seems to be written to the page, I search in the source and cannot see it anywhere, I have tried moving this around from the head to the body of the html masterpage, Im really confused as to why this is not workung, please help public static string RenderBaseUrlScript(this HtmlHelper helper) { return string.Format("<script type='text/javascript'> $.url=function(url){{return '{0}'+url;}}", GetBaseUri()); }

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  • Start Line with (New... in VB.net

    - by pedro_cesar
    Hello; Why can't I start a line using a parenthesis followed by the keyword new?? For example: (New <custom_obj>).foo(var) In that case is obvious that I'm trying to avoid creating a named instance of the the <custom_obj> because I know that I'll only be using it at that sentence. Note that actually creating a named instance is not a problem for me... I just wanna know the reason why this is not possible.

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  • ASP.NET Custom Control - Template Allowing Literal Content

    - by Bob Fincheimer
    I want my User Control to be able to have Literal Content inside of it. For Example: <fc:Text runat="server">Please enter your login information:</fc:Text> Currently the code for my user control is: <ParseChildren(True, "Content")> _ Partial Public Class ctrFormText Inherits FormControl Private _content As ArrayList <PersistenceMode(PersistenceMode.InnerDefaultProperty), _ DesignerSerializationVisibility(DesignerSerializationVisibility.Content), _ TemplateInstance(TemplateInstance.Single)> _ Public Property Content() As ArrayList Get If _content Is Nothing Then Return New ArrayList End If Return _content End Get Set(ByVal value As ArrayList) _content = value End Set End Property Protected Overrides Sub CreateChildControls() If _content IsNot Nothing Then ctrChildren.Controls.Clear() For Each i As Control In _content ctrChildren.Controls.Add(i) Next End If MyBase.CreateChildControls() End Sub End Class And when I put text inside this control (like above) i get this error: Parser Error Message: Literal content ('Please enter your login information to access CKMS:') is not allowed within a 'System.Collections.ArrayList'. This control could have other content than just the text, so making the Content property an attribute will not solve my problem. I found in some places that I need to implement a ControlBuilder Class, along with another class that implements IParserAccessor. Anyway I just want my default "Content" property to have all types of controls allowed in it, both literal and actual controls.

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  • How to remove the link if value is 0 using asp.net mvc

    - by kumar
    i have this code.. <table class="dashboard-table"> <thead> <tr> <th>&nbsp;</th> <th>Worked</th> </tr> </thead> <% foreach (var e in Model.ExceptionsByType) { %> <tr> <td> <%=Html.ActionLink(e.ExceptionTypeName, "VirtualScrollingDataRequested", Model.exceptionCategory.GetControllerName(), new { C_EXCPT_TYPE = e.ExceptionTypeID, GUI_SPEC_STAT_DSPL = 2, C_EXCPT_CATG = Model.exceptionCategory.Id, @ASSET_CLASS = string.Empty, @INST_MNEM = string.Empty, @_lock = "ALL" }, new { @title = e.BuildGridTitle(2, e.ExceptionTypeName) })%> </td> <td class="number"> <%=e.WorkedExceptions %> </td> </tr> <% } %> </table> e.WorkedExceptions is the count of exceptions.. I need to to the condition here if the e.workedexceptions == 0 I need to remove the link? please can any body hlep me out? thanks

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