How can I bind an object to a dropdown list or gridview ? I am writing an application where my code behind calls an instance and bind the list to either dropdown or gridview.For example:
.aspx page: default.aspx
<asp:dropdownlist id="dd1" runat="server" />
Code Behind: default.VB
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have some Objects, lets say Employee and Role defined as below and I have defined relationships in my database that gives me a list of objects say employees and thanks to my framework each employee object also has a Role object linked via the RoleIDID, UserName, Password, Email, RoleIDRoleID, RoleNameSo in code I can do something like this
Employee emp = dataService_GetEmployeeByID(1);
string RoleName = emp.Role.RoleName;
Now here is my problemI can bind any object in a repeater and it works fine for the first level in my relationship
For instance <%# Eval("UserName") %>
But I need to be able to show the details for my child objects as well (Role) so something like this (which does not work)
<%# Eval("Role.RoleName") %>
I know how to bind a simple objects to a dropdown list. However I am having problems binding my objects which contains sub objects to the control.i.e. with simple object i just do ddl.DataValueField = "myproperty"
with my objects they contains sub objects which i want to bind. I have tried ddl.DataValueField = "sub-object.myproperty" which doesnt work.
Declaring the SqlConnection and SqlCommand objects in a webform without CodeBehind I am trying to query data from a MS SQL server with a C# web form without "CodeBehind". I want to write the information to a table in the web form's body.
I am having trouble declaring the SqlConnection and SqlCommand objects that connect to the server.
How do you use "using System;", "using System.Data;", "using System.Data.SqlClient" inside the script element of an .ASPX file?
(code below)
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I have been reading alot about this and for some reason I am just not able to grasp the concept. Hopefully someone here can enlighten me.As an example situation I have a collection of strongly typed User objects that represent a database table, and some properties that represent its columns: UserID(PK), Username,FirstName,LastName, etc..Here are some of my requirements/goals:1. Users/Objects needs to be bound to the gridview programatically.2. I do not want to update the database right away, I only want the underlying collection to be updated. I would like to call the database update method myself when I am ready.
3. I do not want the primary key stored on the client side.Summary:So I bind a List<Users> to a gridview with the appropriate bound fields set up, I exlude bound fields such as primary key because I don't want it being changed/hacked by the client side. When I edit and update a row it is saved back to the collection of objects. I will iterate through the objects manually at a later time and commit them to database.
Questions:1. Can I cast a gridview row directly back to my object, in the RowUpdating or RowUpdated events? I am assuming I can't... So....2. How can I reference back my original collection if the gridview does not contain a primary key?3. Where do I store my collection, should it be in Session or should I recreate it on each postback?Sorry if any of this is confusing, let me know if you need clarification.
I have a class that returns a list of "Category" Objects. I'd like to display them along the left-hand side of the page in a listview (if that's the best way to do it, even).
The category objects have normal attributes. Title, User, NumberOfProjects. I'd like to display both the title and the number of projects in this list.
Not worried about editability right now as we might make that separate (i.e. not in-line in a list view edit mode).
With ASP.Net 4, is there any way that we can bind web-form controls to entity framework objects?
<asp:TextBox ID="UserName" runat="server" BoundTo="UserName" BindingSource="..."></asp:TextBox>
so just like in MVC I can
form.UpdateModel(userObj),
form.DisplayModel(userObj)
I'm making the switch from vb.net to c#, and am just trying to bind some data from a reader in my c # codebehind, but no matter what, the gridview always skips the first row returned from my stored procedure. What am I doing wrong?
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I have a List of complex objects containing other objects within that I give as the data source to a gridview.(currently I'm using BoundFields for the columns). I need to bind data to the columns from the objects within at run time. How can this be done?
View 1 RepliesSo my question is more in relation to what people consider to be the best practice and why:
I've been dropping literals into pages and repeaters and binding them in code behind for a while. Is this considered bad practice?
ie:
ASPX Page:
<asp: Literal id="litTextToInsert" runat="Server" />
Code Behind:
litTextToInsert.Text = objData.MyText;
OR (repeater):
[code]....
I personally dont like doing this as i find it makes it harder for me to know if someone changed the field name, or mis typed it during development - the other way you won't know until the page loads.
With the strongly typed version if something changes in your DAL etc the build will break - letting me know I've messed up.
Why do so many people appear to use weakly typed code in ASP.Net (in examples, MVC, etc)?
Am i missing something?
firstly a static class only ever exists once and is not an instance. Any static members (ie static int NoOfPeople;) is stored in one place and is shared between all sessions (like the old global variables).
Now static methods is where i'm not 100% sure. If I have a static method that doesn't use any other static members could this cause inconstant results, example (this is a fairly pointless method but just a quick example of the top of my head)
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So in this example if two sessions (or threads) were to call this at the same time - would they both get back the expected results, because the method only uses private data (a, b and totalToReturn).Im sure this sounds a little simple but I will be using static methods to build user objects and various other objects that there will have to be a 100% garentee that the objects will not get mixed up between sessions and the wrong things return to the user.
I'm working on a project in which we have a database, data layer (entity framework), business layer and web/UI layer.I want to use ASP.NET Dynamic Data for the web layer, but don't want it to access the data layer or database, as I want it to be purely running off business logic, and not directly accessing the data.However, it appears that Dynamic Data only allows Linq-to-SQL or entity framework data sources to be used.Has anyone used it with business-layer objects instead?
View 1 RepliesLets say I am doing a shoping cart. I authenticate the user with a session variable.For example:
If(Request.IsAuthenticated)
// Here I want to add to the shoping cart.
// Can I do the following
Session["Cart"] = "Washing Machine";
Now will this Session["Cart"] value which is washing machine here be unique to diff customers?
I hosted my application in production. Within 5 to 6 hours the application pool spikes and uses more memory?
What application objects or system objects are stored in the application pool?
What's the difference between binding for example a column called ("Name") in both cases ? and is there's any performance difference ?1- Assigning the data in the mark-up
<asp:Label ID="Name_Lbl" runat="server" Text='<%# Eval("Name") %>' ></asp:Label>
2- defining a control object for every control inside the repeater ItemTemplate and find it and then assign the data in the column "Name" to ite.Item.FindControl("Name_Lbl")
May I know what is the diffrence between static binding and dynamic binding and which binding is used in
1)Virtual Functions
2)Abstract Class
3)Function Overloading
4)Operator Overloading
5)Fuction Overriding
6)Delegates
see this code:
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While in constructor i am gettine error, Aobj(0).type is not initialized, it says that Object reference not set to an instance of an object. how to initialize my objects?
I have a panel which is filled with textboxes and labels. I have appropriately sized this layout panel to fit in the contentplaceholder. Unfortunately this layout panel does not stick properly in this contentplaceholder. It moves out of the contentplaceholder when the window is resized. Is there a way for the panel to stick to the contentplaceholder?
If a text is entered in this contentplaceholder, it will move along with the contentplaceholder. But I want objects (textbox, labels, panel etc) to stick with the contentplaceholder and move along with it when the window is resized. What is the way for this?
I can manually add an I.P. address to the IP Address and Domain Restrictions form in IIS, but how do I do that in codebehind dynamically. In my web App, after a user has provided their login information, I want to be able to add their I.P. address to the list so that they can access the site automaticaly through codebehind.
View 6 RepliesIm using lighbox2 and this code for "static"pictures http://www.dynamicdrive.com/dynamicindex4/lightbox2/index.htmHow can i do this for "dynamic" pictures?
View 5 RepliesI can not get the javascript function below to fire, what have I missed from the code?
View 11 RepliesI am creating HTML objects in my code, and giving them IDs (see below) :
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But whenever I try to make reference to this ID in my code, it does not work. After viewing source, the ID has been changed to ctl00_ContentBody_divMTR. Why is this happening and can I prevent it?
with asp.net 4, is there any way that we can automatically bind web controls (textbox, listbox, check, etc), to EF4 Objects?
View 2 RepliesI have a master that I am trying to load a certain stylesheet based on some data. I have a function in the code behind of the master page:
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Then in the head of the master, I have:
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I've tried "Eval" too but if I set a breakpoint in the LoadFacilityStyles function, it never even gets triggered/called. Is this possible to do with .master?
I can't run Javascript from codebehind in my component.
My compenent simply listen a server from TCP/IP socket and create a nre thread for listening.
this.tcpClnt = new TcpClient();
this.tcpClnt.Connect(this.HostIP, Conversions.ToInteger(this.HostPort));
this.Stm = this.tcpClnt.GetStream();
new Thread(new ThreadStart(this.ReadSocket)).Start();
In my component ChangeState event, I'm trying to update a label.text.
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I tried with RegisterClientScriptBlock but it didn't change the label text.