C# - Cannot Read Multiple Rows From Sqldatareader
Apr 15, 2010When I query for only one record/row, sqldatareader is giving correct result but when i query for multiple rows, its giving error on the client side. below is my code.
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When I query for only one record/row, sqldatareader is giving correct result but when i query for multiple rows, its giving error on the client side. below is my code.
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I have a SQL Server 2008 database and I am working on it in the backend. I am working on asp.net/C#
SqlDataReader rdr = cmd.ExecuteReader();
while (rdr.Read())
{
//how do I read strings here????
}
I know that the reader has values. My SQL command is to select just 1 column from a table. The column contains strings ONLY. I want to read the strings (rows) in the reader one by one. How do I do this?
how to get the number of rows from sqldatareader
View 2 RepliesIn SQL Server 2008 bit is like boolean (true/false), but I tried to read the bit value (0 or 1) and got error. How can I read it?
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i need to Get Two rows details in variables using SQLdatareader and using while loop in it.Can i do so,
my query and while loop are getting fired when i debug and see my while loop...but i dnt know how to get details and show or store it, when i will get 2 records on execution of query.
MY CODE IS BELOW...
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how to read data from the sqlDataReader .
sqlDataReader sdr = sql_comm.executeDataReader();
if(sdr.hasRows)
{
while(sdr.read)
i=0
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My question is how do i use SqlDataReader to read the last row added to a table getting the contents of a column and storing it as a c# varaible
I am developing a message pool means like a Facebook when we click on above message icon all message show in list .then click on the sender name all message show that person. For
That kind of message poll am developed two pages one page is sender and the other one is receiver .when I send message from sender page it will be saved into data base and show into other pages text box.
Now problem is that the receiver pages cannot show all messages .it will show one first message which are saved into database.
I want it will show all messages which are sending from sender page. below my all code.
WebForm1.aspx.css
using System;
using System.Collections.Generic;
using System.Linq;
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I need to produce a from where I can add multiple parts. Each time a user enters a part number, the description should be populated. The user can then click add and this part and description will be shown below. They have the option to add as many parts as they require. Once all parts are added the user fills in some general info eg description and then once a submit button is clicked all part info will be inserted into a table and general info will be inserted into another table with one unique ID.
View 5 RepliesI am not able to find the projects related to working with excel sheets by using ClosedXML to refer. I have an excel book which contains two sheets.
In sheet 01: In column A: In B: In C:
Student name01 Student's phone number blabla
Student name02 Student's phone number blabla
Student name03 Student's phone number blabla
In sheet 02: In column A: In B: In C:
course name01 computerscience blabla
course name02 dhfsthshbstgs blabla
course name03 garsfghsefrgs blabla
now, I would like to see in two comboboxes (all the words/text presented in the column A) from two sheets, the student name and course name and then I want select any student name and course name of my choice. Afterwards, when I click on a button, my program should display the students phone number and the course name (from column B from both sheets) and related things present in the Column C D E.. of the selected things in combobox in a label or a in a textbox.
PS: I solved the following problem: I can select student name in one combobox and print the the corresponding data from the only one column B (but I worked only with one sheet). It is bit complicated for me to continue with two sheets.
I am listing about 20 rows, each row represents an Order.Each row needs to have 3 buttons, each button click will perform a different action.I have 3 actions to handle each button post request, I am just unsure how to setup the Html forms for each button.
<tr>
<td>
<form method="post" action="/orders/do1"><input type=button ... /></form>
<form method="post" action="/orders/do2"><input type=button ... /></form> [code]....
Should I create 3 forms for each button, per row in my listing?(that would mean 20 rows x 3 forms = 60 forms on a page)Is that 'ok' to do? (i.e. or is there a better way to do this?)
The 'while (dr.Read()) statement in this code set is not process all the rows picked up by the sql statement in the access file. It will only process the first row found and ignore the rest. I can't seem to figure out why.
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Here is the code in my access file: Product_Series_PendingAccess.sqlSelectAllRows
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I would like to be able to read the first row of a table and then each successive row sequentially individually. So, is there a way to read the first row of a table, whatever the primary key may be, and then read the next sequential row in the table until the last row has been read? I need to be able to do this in order to create a list of column entries in each row for a listbox control that a user can select from.
View 3 RepliesI asked a question similarly, but the outcome was pretty messy and I was having difficulties populating so I'm trying to go at from a different angle: [URL]
I have a table which stores steps in a process. Some companies only have 6 steps while others have 15, so I created a table with 15 different slots for steps. What I would like to do is set up a control that displays each step in its own row with a label next to it saying "Step '#'", and not in an adjacent column. I'd also like for it to not display any blank rows. If they are entering the step instructions, I would want for them to have to press a button that would add a row so that they aren't just given 15 empty text boxes to fill in.
What would be the best control to do this in, and how would I get started in setting it up?
How do I loop the gridview to read or insert one row by one row?I have a database which has a Primary key. Currently,all the rows seems to appear at one time.Even when I use a counter,it did read one row from a textbox(which is for my testing to read one row) but in the database,it still inserts the whole rows from the gridview.I can't click button twice as it will occur an error "Primary Constraint".
View 6 RepliesI need a way to read all the rows in one column from an Excel file that the user picks from a fileupload control. I tried saving the excel file on the webserver with the upload control and then opening it with a OleDbConnection but that fails when running it from the webserver and gives the error:
Request for the permission of type 'System.Data.OleDb.OleDbPermission, System.Data, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed.
This works fine when just running it localhost, so i figured it might be a problem with security level at the webserver which i cant change. Instead i tried doing it with a streamreader direct from the fileupload control and because theres no need for saving the excel file on the server, but im not sure how to query the rows i need this way.
i have a method that do bunch of inserts in a table
these inserts done through a transaction (with default isolation level)
meanwhile i need to read some committed records from this table by using another method, i create another transaction for 2th method with a ReadCommitted isolation level but it just fails and return a timeout error and also, the DoTransaction cause the entire table inaccessible, how could i apply a row-level lock ?
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I have the following fields in an Appointment table:
ID(PK), TeacherID, DayID, TimeslotID, ParentID, StudentID, Remarks & Editable(bit, Default value=1)
I am developing an application to allow parents to book appointments to meet the child's teachers.
It is compulsory for parents to meet child's mentors, hence Appointments to meet class mentors are already pre-booked in the Appointments table.
Parents could still book appointments to meet other subject teachers. I have a column in my gridview to show parents the list of booked appointments. Parents are allowed to change the Appointment timeslot for an appointment they booked and are not allowed to change appointment time for pre-booked appointments.
Under the Remarks colum, it is stated that the following appointment is pre-booked by class mentor.
How do I make only those pre-booked rows read only since all the appointments belonging to a parent is under one GridView.
I found an example, but this is to only make the 1st 3 rows read-only and I don't think this is in VB coding. I'm usingASP.NET VB coding.
I am getting this error:
CS1061: 'System.Data.SqlClient.SqlDataAdapter' does not contain a definition for 'Rows' and no extension method 'Rows' accepting a first argument of type 'System.Data.SqlClient.SqlDataAdapter' could be found.
Here is my code, what am I doing wrong?:
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Can someone explain to me if there is a way to have multiple inheritance? as I have a form with functionality in the FrmCasePlanInnerDB.cs. And has the look I like where multiple rows show up when I run the Template Engine. Is there anyway to combine features to make the form look like it has multiple rows instead of just one row of output? I have tried two ways to get the Form_FrmcasePlanInner and TemplateEngine both to be the parents of my form here's the first:
<%@ Page AutoEventWireup="true" Title="Case Plan Inner" Language="C#" MasterPageFile="~/Forms/FormMaster.master" CodeFile="FrmCasePlanInner.aspx.cs" Inherits="Forms_FrmCasePlanInner,~/Bin/TemplateEngine.WebSitePage" %>
I have two ListBox in my ascx file, I fill them with some data (no problem here), I make them multiple and increase the size, below is my code.
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I use some jQuery code to exchange element between them (Here too, no problem). My problem begin when I post my form, I'm unable to get the data from the DropDownList with attribute multiple or size. I tried in my controler to add a FormCollection parameter, I can see every element in my form except those select tag with more options than id and name. I tested to put a manual select tag in my code with only an id and a name then add size and multiple attribute, when there is only id and name I can get the value but when there are more I can't get my select tag in the FormCollection
Also I need to get all the value in the ListBoxand not only the ones who were selected. I have been searching answer for 2 fays now... Without success, I only find resource on how to show ListBoxbut not how to get values from them in mvc web site and I don't find any resources who talk about multiple selection ListBox, I think I'm a bad searcher but....
if it is possible to read data from a CD and load multiple files from it without actually having to browse for each one through an ASP page. I searched the web and all I can come with is to set however many number of file upload controls onto a page and upload each file individually whereas I am looking to search a directory and upload all files with a certain extension with only one file upload control.
View 6 RepliesIf more than one person is using the web application, and the web application requires to read a specific file (and in my case, I use StreamReader), I've noticed that the any other instance of the web application would have an exception error when trying to read a file. How do you handle this? And how about when it comes to writing to the same file (if possible)?
View 5 RepliesI am accessing rows in an SQL database table based upon the contents of the Primary key and another column. But, I cannot insert new rows in the table when the content of the new Primary key column already exists in another row. Can I define the table with a multiple column Primary key so that a unique value can be based upon the content of both columns?
View 3 RepliesProtected Sub btnAddRow7_Click(ByVal sender As Object, ByVal e As EventArgs) Handles btnAddRow7.Click
Dim tableRow As New System.Web.UI.WebControls.TableRow
Dim tableCell As New System.Web.UI.WebControls.TableCell
Dim textBox As New System.Web.UI.WebControls.TextBox
tableCell.Controls.Add(textBox)
tableRow.Cells.Add(tableCell)
tbl7.Rows.Add(tableRow)
End Sub
but it only adds one row dynamically. After the first addition, more clicks to the button will not add more rows.