DataSource Controls :: Use Information From Database In The Code-behind?
May 11, 2010
Basically the main page has a couple of DataSourceObjects sucking information from a local database and displaying them on the page. The page is a form, which then generates an HTML email and fires it off using the SMTPClient. The problem is that I cannot seem to get the data from the database to be accessable from the code-behind. Attempting to get data from either of the ListViews results in a number of Null Exception errors, mainly when using the ExtractItemValues method. The OrderedDictionary that comes back always seems to be empty. So I figured I'd use one of the 3 Object Data Sources I already have set up, that queries the actual database, but cannot find any way of calling the Select statement present in either of them, let alone managing to store and access what comes back.
It's probably something small but I can't seem to find what went wrong. I am trying to insert information into my database. It goes through the code just find but it doesn't insert into my database. Here's my code:
I have a website that displays information from my database into a gridview. The gridview has a checkbox, that once selected, is suppose to move a 'Y' into the field that has the checkbox selected. I have it generating the code, and displaying the code on my page to confirm, but the database is not being updated. Here is my code,
I'm using Content Management System, DotNetNuke for my dynamic website. DNN itself they have one database, I named it dnnDB. Inside the dnnDB they have the users table which have the list of users. I need to be able to pull this set of information or synchronize to my own database, myDatabase for development purposes. I do not want to incorporate my database into dnnDB, afraid that I may corrupt the system.
I build a webpage to edit the data entry, all the textbox wroks fine. However when I update the value originally took in using dropdown list , I get error and couldn't get correct update.
I am using an SQL Express server hosted on a different machine and it is listed in my server explorer just fine. It is listed as my connection string in my web.config just fine as well and lastly it seems to sync just fine with my asp.net membership tables. My question is does it need to be listed in my app data folder of my site? Currently I have the ASPNETDB.mdf connection listed, which is apparently just a local sql express connection. The database I am using in my webconfig and other files is not listed so do I need to add it there?
Second question is about DAL, Data Access Layers. I have mostly been using presentation level SQL commands with my data presentation controls. Manually entering separate select, insert and update statements. I just went through a tutorial that stated the best way to interact with your database in asp.net is with DAL using table adapters. It mentioned that it gives you the ability to use strongly-typed references to each row. My question is can I use the same method multiple times on a single page. For instance a method inside an adapter named GetProductsByID(@ID) ? What if I want this bound to three different gridviews on a single page? Anyone have any other general things to point out about using DAL over presentation level commands?
I have some issues about retrieveing and storing date information to my database (ms sql server 2005).My data column is a DateTime, and i have set my web.config globalization culture is set to "en-gb"
When i retrieve date from the datebase it appears as dd/MM/yy, that's fine. But i cannot insert a new date as same format?! It will only accept MM/dd/yy or yy/mm/dd.Right now i'm using this code to correct the error:
[Code]....
Is it possible to change the date format on the database or something, so i dont need to use this code?
SQL Server Express 2005 MS Visual Studio 2005 Using ASP.NET with VB code behind. Requirements: Click a button on an ASPX page to disconnect temporarily all DB connections when not in use to allow a script to backup/copy the database to a safe backup location. When a user access the db afterwords, the DB connections will be re-established.
If this is imposible, recommend an alternative. Note: I am working with what I have been given and authorized to use.
i've got some problem reading excel files to store into sqlserver database. currently my code has a fileupload control and a button for me to save the excel file into a folder and read the data inside the excel file and write it into the sql database. The code works only if the excel sheet name is Sheet1.xlsx, however i tried upload a diff file named ImportUserFile.xlsx and it gave me the exception below. 'ImportUserFile$' is not a valid name. Make sure that it does not include invalid characters or punctuation and that it is not too long. i have also tried other file names and it seemed only Sheet1.xlsx works.
I'm using SQL server 2005 and Visual Webdeveloper 2008 express.
I have a database created and I've successfully connected to it. My question is, would it be possible to do something like search the first column of a table for a value, get the index of that row and use the index to get the value of each column? Sort of like you would with an array.
Are there are good tutorials out there that I could use, everything I found shows you how to display your information in a datagrid, which I've already done, but I can't find anything on how to get an individual row's information.
How can I retrieve information from delete rows. I delete some rows from table in dataset, then I use method GetChanges(DataRowState.Deleted) to get deleted rows. I try delete rows in original table on server side, but it finished with this errors. I try get value of columns from row, which was deleted [Code]....
I have a C#/Asp.net web application which caches SQL DB schema information. Is there a way that I can determine what child relationships a given table has? I have looked into using the DataTable.ChildRelations property, but it is never populated with items unless i manually create a relationship using the .add property. I also have access to DataColumn information for each column in the database.
I need to enter text in sql in nvarchar(max) .. the text contains titles and paragraphs.
I was using a separate table called paragraphs to enter paragraph title and paragraph content. These get a 'article ID' so I can read them out of SQL. On my page I format title and content differently.
Now I was wondering if I can enter Title format information into sql (as the <br/>) tags, so that i can enter all article information into 1 table column.
My sqldatabase is inputting NULL instead of the information from my form. Form is collecting different names and multiple phone numbers for each. names, addresses, zip codes are going in as entered on form but phone numbers are not they are going in as NULL. Columns are set as header is Cell, nvarchar, Length is 15 and I have setup as I did other columns. code for my form is (i have removed some lines that are working as expected)
I have a gridview which sources information dynamically from database.
Here when i go for the default "AllowSorting" flag equal to true, i am able to achieve sorting of all displayed columns except the textBox control column whose values refreshes to zero.
Can the select command of a SqlDataSource be given by code in the code behind file. Also by calling the SqlDataSource.Select can the select statement be executed?
I want to bind an ObjectDataSource to a property in my asp page and I want to do it in the page's aspx code, not in code-behind. I've already done it in code-behind, as follows:
[Code]....
I'd prefer to get rid of the ugly code-behind and just do this in mark-up. Something like [Code]....
This gives me a run-time error: Cannot create an object of type 'System.Object' from its string representation 'SelectedBook' for the 'DataSource' property.Is there a way of doing this declaratively and not in code-behind? Further, what if what I want is to actually use a child property of the property in question? For example, if my Book object has a ReaderComments collection, can I databind to it decaratively in the aspx mark-up?
I'm using CreateUserWizard for creating an user but asp.net automatically add user to ASP.NET database I want to add user in my database and in my customer table. I have tried these code as peer below but nothing happened
