DataSource Controls :: Retrieving Tables Using Reader?
Jan 20, 2010
I'm quite new to ASP.NET and i was wondering if someone could answer some of my questions.1. What is the difference between a DataTable and an Array? Is the DataTable a serverside control? Is it exposed to the user?2. Does the reader retrieve the column names? If so- how can I capture them? Are they the first row?2. Is it possible to populate an Array using the following sort of code, and if so- how?:
SqlCommand tableCommand = new SqlCommand();
SqlConnection tableConnection = new SqlConnection();
tableCommand.Connection = tableConnection;
[code]...
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Aug 17, 2010
I have hard time trying to find the solution to retrieve data from multiple tables in one database.
table Kategorije has fields: idKategorija, naziv, opis table Clanak has fields: idClanak, idKategorija, naslov, autor,...
Kategorije.idKategorijais joined with Clanak.idKategorija, but that isn't the solution because I want my web site to show the Kategorije.naziv instead of Kategorije.idKategorija. This is the code I'm currently using to get idKategorije shown on my web site:
[Code]....
[Code]....
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Jan 7, 2010
how I can loop through the results in VB, I only ever seem to get the last row, I would like to list all rows.
My code is below
[Code]....
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Sep 29, 2010
Here is what I have tried:
txtCost.Text = string.Format("{o:c}", dr["Cost"]);
Here is the error I receive. How can I format the data that is coming from the data reader into currency format??? Also, is there a way to format it into currency without the dollar sign?
Input string was not in a correct format. Description: An unhandled exception occurred during the execution of the current web request. review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.FormatException: Input string was not in a correct format.
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Jun 4, 2010
[Code]....
but if table is empty i.e. there is no record for Store_no=storeno then it bill_id = (Convert.ToInt32(reader[0]) + 1); give a Null exception.
I want to set bill_id=1 if there is no previous record in table of that particular store number. then How to do this.
i.e. How to check that reader[0] is null
cmd1 = new SqlCommand(" Select Max(Bill_No) From Bill_Record Where Store_no='" + storeno + "'", hookUp);
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Feb 8, 2010
I'm getting "This SqlTransaction has completed; it is no longer usable" exception when try to commit my transaction after sqlreader is close.Here is the code sample
[Code]....
...so when I get to commit the transaction it raises the mentioned exception: "This SqlTransaction has completed; it is no longer usable". I have also noticet that Command.Transaction becomes NULL after reader.Close()My question is: Can I use SqlDataReader and SqlTransaction ? Maybe to use BeginExecuteReader and EndExecuteReader ?
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Apr 10, 2010
I have been able to successfully read a row of data from an SQL table using two column parameters. Now I would like to update this row with new information. Is this possible since the reader does not specify which row was read with the 'reader.Read();' command?
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Sep 14, 2010
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May 24, 2010
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protected void Page_Load(object sender, EventArgs e)
{
if (!Page.isPostback)
[code]...
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May 20, 2010
So far i've populated my grid view with my roomID. however using data reader I don't seem to be able to get more than one column to auto generate even though i'm now looking for three values : SELECT tt_roomEquip.roomID, tt_room.roomCapacity, tt_equip.equipTitle is my select bit of the sql, though it's only putting roomID into my grid view.
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Feb 16, 2010
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Apr 9, 2010
I get the following error when I try to update rows in the DebtorList table : Invalid attempt to call FieldCount when reader is closed with LINQ
// Query the database for the row to be updated.//USE DL TEST VERSION...
var queryUpdateWithoutExclusions = (
[Code]....
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Jan 14, 2010
I'm currently trying to build a html table from the results of a sql data reader. As my table has multiple records, I want the code to loop through the reader and output the details on individual lines of the page. In ASP I have done this in the past using something like
[Code]....
but as I am using data readers I'm not sure what the equivalent is.
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Feb 1, 2011
I am using VS 2005.I have 5 tables depending on their values ,I need to draw a bar chart.
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Feb 22, 2011
I have some code in my vb.net code behind that queries a database, and if there is data, outputs it from the codebehind to a datalist on my asp.net page. In addition to sending the data to the datalist on the page, I need to take the value from "mbillaty" that is returned from the sql query, and have that value be the selected value for a drop down box also on the page. I can get either the datalist to fill, or the selected value for the dropdown box to be selected depending upon which bit of code I place before the other (ARGH), but I can't get them to both work together on the page. What am I doing wrong?
[Code]....
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Feb 3, 2011
When I used the (way #1) below I could retrieve search result from my DB
Way #1:
[Code]....
But When I use( way#2) "separating my code to Presentation layer and data access layer ( using SQL HELPER CLASS )"
Way # 2
Presentation layer: protected void btn_Search_Advance_Click(object sender, EventArgs e)
[Code]....
data access layer:
[Code]....
I keep getting this error: Procedure or function 'SP_Search' expects parameter '@SEARCHTYPE', which was not supplied.
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May 1, 2010
iam using asp.net with c#
iam saving two images in database but while retreving only one image is displaying
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[Code]....
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Mar 17, 2010
I try to use one Calendar, i have example with XML, but i wont to read from SQL,
[Code]....
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Jun 14, 2010
I am trying to retrieve a Guid from the database but my application just isnt having it. I have a field in the database called "LoginUserId" and it is of type "uniqueidentifier".In my User Model I have:
[Code]....
I keep getting the error: Specified cast is not valid.
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Feb 24, 2010
I'm new to asp.net, php had this function that could store sql date in an array, I can't find something similar in .net, so this is what I came up with so far.
Sub Compareid()
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using connection As New SqlConnection(ConfigurationSettings.AppSettings("sqlacct")
[code]...
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May 26, 2010
I have a picture that i would like to upload to a database. I am really new to this so i am not sure what to do. I have been using the following code below to upload and retrieve the picture, looks like its uploading ok, but i cant retrieve it. The code i am using comes from this site,
http://www.dotnetcurry.com/%28X%281%29S%28e2mwozemizhla24555f41uzz%29%29/ShowArticle.aspx?ID=129&AspxAutoDetectCookieSupport=1.
Uploading Content to database
try
{
if (cmboTopic.Text == "Blu-Ray Movie")[code].....
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Jun 4, 2010
I have a ListView inside my UserControl which is showing a list of posts from the table named posts. I've also got a category table which is full of the categories. I then have another table which contains the PostID and the CategoryID so that posts can have multiple categories. I was wondering, in my ListView at the moment I only have a list of the posts but I would like to add, for every post in the listview, the cateogires it is in.
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Feb 6, 2010
but i have a problem to retrieve value from the database in the textbox using 3-tier application. ]
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1> employeeBAL in this i have 1class file called empbasicinfoBLL.cs
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Jul 29, 2010
I am not sure how to do this. I would like to merge the identity back into the dataset.
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Apr 12, 2010
Usual situation: DataList and LinqDataSource with anonymous types...
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