DataSource Controls :: Accessing A Record In Code Behind In C#?
Feb 21, 2010
I have a page called Article.aspx that takes content from the database. I would like to use the title of the content as the title of the page for a little SEO I am doing. I setup a literal on the aspx page that must take the value of the content title from the code behind, what is the best way about doing this? I'm guessing I need to open a data base connection to read the record from the table but I am still learning asp.net and not sure how to write it
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May 31, 2010
I converted code from VB that works to c# to insert a record in an SQL daTA BASE.
The VB code is as follows:
Insert a new record into Contact
Dim connectionString As String = ConfigurationManager.ConnectionStrings("aspnetdbConnectionString").ConnectionString
Dim insertSql As String = "INSERT INTO Contact(UserId, Notes) VALUES(@UserId, @Notes)"
Using myConnection As New SqlConnection(connectionString)
[Code]....
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Mar 29, 2010
Consider I am using 3 fields staff id, staff name and phone no. Staff id is a primary key. I want to get a error "the record already exists" if there is already a record in the same id when i am clicking add record button. (Plz give the full coding including stored procedure for insert).
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Jun 24, 2010
I am counting from a table for that i have written code as below
protected void get_Id_Afterpoint()
{
int counter = 0;
string strSql = "select count(*) as ID from tblEnergy where ID=?";
OdbcCommand com = new OdbcCommand(strSql, con);
com.Parameters.AddWithValue("ID", DropDownList1.SelectedValue);
OdbcDataAdapter oda = new OdbcDataAdapter(com);
DataTable dt = new DataTable();
oda.Fill(dt);
if (dt.Rows.Count == 0)
{
lblID2.Text = "1";
}
else
{
counter = dt.Rows.Count;
counter = counter + 1;
lblID2.Text = Convert.ToString(counter);
}
}
there is no record related to DropDownList1.SelectedValue. but as i am counting if(dt.rows.count) and i put break point on the bolded part it shows 1 record. how it can be possible?
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Dec 20, 2010
I am creating an album using the following stored procedure, which returns the primary key for the newly created record:
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE PROCEDURE [dbo].[fpa_sp_albums_update_insert]
@album_id int,
@album_name nvarchar (50),
@album_descr nvarchar(250),
@album_img_cover_id_FK int,
@album_creation_date date
AS
If @album_id > 0
UPDATE [fpa_albums]
SET
album_name=@album_name,
album_descr= @album_descr,
album_img_cover_id_FK = @album_img_cover_id_FK,
album_creation_date = @album_creation_date
Where ((album_id = @album_id))
Else
INSERT INTO [fpa_albums] (
album_name,
album_descr,
album_img_cover_id_FK,
album_creation_date)
VALUES (
@album_name,
@album_descr,
@album_img_cover_id_FK,
@album_creation_date)
Return SCOPE_IDENTITY();
I execute the above stored procedure using the SQLHELPER. The VB.NET code for the page is as follows:
[Code]....
However, the createdAlbumID always shows -1 instead of the id for the newly created album.
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Jul 4, 2010
I created a user control in Asp.Net which I populate with <asp:Table id = "...." /> this table has columns that contain dropdownlists, textfields and other web controls. In the code behind I am not able to access these web controls, is there a way I can access them. or I shouldn't be doing that in the code behind of the user control? here is my ascx code markup:
<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="MarriageControl.ascx.cs" %>
<%@ Register assembly="BasicFrame.WebControls.BasicDatePicker" namespace="BasicFrame.WebControls" tagprefix="BDP" %>
<asp:TextBox ID = test runat = "server" />
<asp:Table ID = "marriageInfoTable" runat = "server" Caption="معلومات الزواج"
CellPadding="2" CellSpacing="2" Width="979px" Height="164px">
<asp:TableRow runat="server">
<asp:TableHeaderCell runat = "server" Text = " " />
<asp:TableHeaderCell runat = "server" ID = "husbandHeader" Text = "الزوج" HorizontalAlign = "Right" />
<asp:TableHeaderCell runat = "server" ID = "wifeHeader" Text = "الزوجة" HorizontalAlign = "Right" />
</asp:TableRow>
<asp:TableRow runat="server">
<asp:TableCell runat = "server" Text ="الاسم الرباعي" />
<asp:TableCell runat = "server">
<asp:TextBox runat ="server" ID = "fullNameHusbandTextBox" Height = "30px" Width = "250px" Font-Bold = "true" Font-Size = "20px"/>
</asp:TableCell>
<asp:TableCell runat = "server">
<asp:TextBox runat ="server" ID = "fullNameWifeTextBox" Height = "30px" Width = "250px" Font-Bold = "true" Font-Size = "20px"/>
</asp:TableCell>
</asp:TableRow>
<asp:TableRow runat="server">
<asp:TableCell ID="dateOfBirthCell" runat = "server" Text ="تاريخ الميلاد" />......
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Feb 16, 2011
I know in standard VB.Net development, you can access any form field from within a module class but I'm not sure how to do it using Web Forms.Here is my scenario:I have a Module.vb where I am putting all my Database Functionality. In each of my functions, I'm using a Try Catch construct.
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Mar 5, 2010
I've a web project where i've an Tab Container (ajaxtoolkit), and when i run the project it works properly. But when i debug it, it gives me erros in all the controls inside the Tab Container that i'm accessing through .cs code behind (buttons, checkbox, etc).
Visual Studio gives me "The name 'controlname' does not exist in the current context". This happen to all controls inside the Tab Container that i'm accessing in code behind, but the Web project is running with no problems! As it's the first time that i use an Tab Container, i don't know if this is normal or maybe of Visual Studio 2010 RC (or not).
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Jan 25, 2010
I've been playing with a certain detailsview for most of last week. This particular control is located within a panel that is hidden until a user clicks a linkbutton on a gridview. Then the panel's visible property is set to true and the detailsview is populated based on the commandargument passed through the link button. What I've discovered is that with each postback, the datakey or control parameter, still not sure which or if both, is lost. I've discovered a lot about ViewState and how controls work and am a bit surprised that something as common as using a detailsview within a gridview wouldn't be handled better than it is now. I have been able to get the proper information to build a correct select statement when the user decides to edit a record. I am now working on an update statement, but for some reason while I have the right key to update the right record, I am unable to access the user-generated data that was entered in the details view.
For instance, I select record with ID of 1 in the gridview. It pulls up the detailsview and I can view it. I then click edit. The correct record is still there. (It was previously going to default). When I enter new text in a textbox and click update, the app still knows I am working with record #1 but doesn't seem to be able to find the textbox control. I have currently hard-coded a value into the field just to see if I could actually get the record to update and it did. I am using an OnInit to cause the sub to run and think this might be the problem. However, I have been unable to find a better way around this.
Here is the sub that executes on the OnInit() of the detailsview:
Protected Sub notes_binding()
If notesDetail.CurrentMode = DetailsViewMode.Edit Then
sqlNotesUpdate.UpdateCommand = "UPDATE [Oilchange_Notes] SET [notes] = '" & CType(notesDetail.FindControl("notes"), Textbox).Text & "' WHERE [vehicle_id] = " & Session("unitNumVal")
sqlNotesUpdate.UpdateCommandType = SqlDataSourceCommandType.Text
sqlNotesUpdate.Update()
End If
sqlNotesUpdate.SelectCommand = "SELECT * FROM [Oilchange_Notes] WHERE ([vehicle_id] = " & Session("unitNumVal") & ")"
End Sub
And this is the error I get: Object reference not set to an instance of an object. If I'm correct about why it's not pulling the actual value or even acknowledging the control exists and is actually 'notes' (it is), then at would point would be the best to place this code?
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Jan 14, 2010
I'm currently running with this.
[Code]....
Works find on initial page load, but gives me "Object variable or With block variable not set."
on this like "ColourHex = e.Item.DataItem("ColourHex")" on postback?
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Jul 2, 2010
I know this is a beginner question but I am struggling to find any clear tutorials etc on how I can create new records in a database table based on information added into text boxes on a page. Also what is the best way to do this LINQ, dynamic data website etc etc?
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Sep 21, 2010
I made a website, 1 database; We have 4 cumputers, the 4 are using the same website and saving datas at the SAME TIME.
The problem that i have is that when 2 people click in the save button at the same time, only onces is in the database, but the others get lost.
Visual Studio 2010, Framework 3.5, MS-SQL 2008, C#.
The conecction is in c#, everthing is in c#.
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Feb 14, 2010
I have a webpage that uses a formview. The formview gets the data from the objectdatasource which connects to a query in a table adapter.
I wanted to add a hyperlink in the page right below the formview that will "hyperlink" to another page passing parameters. Those parameters are values from the formview.
Can I just access the parameters of objectdatasource from outside the formview as follows?(it isn't working)?:
<asp:HyperLink
ID="HyperLink215"
NavigateUrl='<%# Eval("VIN", "Contact.aspx?Subject={0}") %>'
runat="server">Contact Us Regarding This Vehicle</asp:HyperLink>
If not, can I access those parameters in codebehind and do a redirect from there? How do I access the data of objectdatasource from codebehind? If I can do that, I could just put a button. Then in the button's click even, I could do the redirect.
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Nov 11, 2010
Here is what im trying to do I want to, from my c# code-behind, get the code between 2 <asp:Content> tags that are located in one of my .apsx pages.
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Feb 4, 2011
I have a single column returning SQL data source and I want to use the data for a simple if statement, but for the live of me I can't figure out how to do it. *oh for the old days, I wrote the same thing in simple asp in about 45 seconds*
[code]....
For the life of me I can't figure out how to get that data into a variable or any way to access it. I know its probably simple. I have tried functions, etc off the net but everything I try results in another error.
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Jun 6, 2010
I have a gridview control that displays expenses claims received from clients. I have a template field that contains a checkbox - if this is ticked, a value from the gridview is added to a variable and this is outputted to a label control.
What I then want to do is to update the database according to which row has been ticked. I have so far the following code that adds each value to an array, which I was then hoping to access in the sql query i.e. Update table set value = value where id = (id's added to array)..
Code as follows - so far I'm just displaying the count of values in the array to make sure they are actually being added:
[Code]....
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Apr 23, 2010
As the title sugests, I am missing a (basic?) concept as I teach myself asp.net, linq, and C#. It has been awhile since I've done anything object oriented, so I don't know how much that is impacting this gap in my understanding. Anyhow, here is what I am trying to do. I have three SQL Server tables: PERSON, POSITION, AREA. There is a 1 to many relationship between PERSON and POSITION, and a 1 to 1 relationship between POSITION and AREA. Given the following code I verify who the person is who has logged into the browser:
[Code]....
I want to be able to return all of the AREAs the person is able to access, based on the position they currently hold. I am able to easily do this in a SQL Server query, and I am sure I can do this with a SQL stored procedure once I pass the EMPLOYEE_ID to the procedure. However, I would rather do this in the page_load event, and load the returned results into gridview1 for the viewer. The issue I am running into is in building the LINQ query. When I try to build it, I can only get access to two of the three tables, depending on which table I select with db. Is it possible to access all three tables in the same query?
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Jun 1, 2010
I need to do an insert into a database table (SQL Server). I want to compute value of 1 column based on the existing data and then do an insert. How do I prevent another user from getting access to the database in the middle of this process?
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Feb 16, 2010
I have a class that derives from System.Web.UI.Page and have set my pages to derive from this custom page class instead of Page. At runtime, the controls are never initialized and throw a NullReferenceException. I've changed some class names and namespaces in the pasted code to protect the innocent. The only thing that I currently override in my PageBase is OnPreLoad and I do call the base.OnPreLoad. I'll eventually add more functionality to this PageBase but for now all that it has is this:
[Code]....
I've tried putting this into a class library (with System.Web referenced) and I've also tried moving the class into the web application and had the same results either way. As another strange twist, I have another class with derives from PageBase called IndexPageBase and it doesn't have this problem:
[Code]....
[Code]....
[Code]....
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Mar 31, 2010
I'm very new to this area and am using ASP.NET 3.5 with WMD 2008 Express Edition and VB code.
How do I write records to the SQL database using VB? I want to use the connection string, etc used in the ASP.NET controls if possible.
My website is a Rugby Club site and I've an SQL database of match fixtures which include TeamId(1XV, 2XV, etc.), Season(2008, 2009, etc) and match date.
I allow some users to update the fixture details but want to insert a series of new fixture records for the neext season which contain just TeamId Season and Match Dates. I therefore want to take the season and Team Id from label fields and then create match dates by adding seven days to a start date.
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Feb 5, 2010
There are several articles and blogs that are sort of about this subject but I haven't found one on point. Wondering if anyone has done this? Using VS2008 creating an ASP.NET 3.5 app with a strongly-typed dataset connecting to an MS SQL backend. In one TableAdapter, I have a custom Insert statement that inserts the record into the primary table. There are two other tables the also need records inserted into them and those records contain the record ID from the primary table. Here's an example of what I'm trying to accomplish:
[Code]....
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Jan 28, 2010
I have the following xml:
[Code]....
If I have an ID, I would like to retrieve the next item that also has the same category as the item ID I have. So, for example, if I have ID=2, I would like to return the item with ID=4 (as item ID=3 has a different category).
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Apr 22, 2010
This is my table.
I want ms sql query to get result
ID ProcessID Processname Date
105 123
Sammying 2010-04-22 12:09:02.827
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Jul 4, 2010
i have a webform to take user inputs. i am able to insert the data into database on clicking add button and also able to view the
records in the detailsview which is in the next webform.I have a edit and delete button in detailsview.
Now when i click edit button, i want the selected record from the detailsview to be populated in the first webform where i can update the record. also deleting record using delete button.i am using c# code,datatable and oracle stored procedure here.
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Jul 27, 2010
I'm programming a webpage in ASP.NET which displays a list of students not listed as participants in something, and upon clicking a student name shows you a brief summary of their details, so the user can ensure they're selecting the right person. Each student is identified by a unique ID.
My code currently correctly obtains their ID, adds it as a parameter to my stored procedure and executes the procedure;
[Code]....
However, when I try to access the results, with say dv.Table.Rows[0], I get the following error:
[Code]....
Upon debugging, there don't seem to be any results returned... when running just the stored procedure in SQL Server with the same data, it does return a single row, as expected.
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