ADO.NET :: Can't Get Reader.hasrows And Reader.read To Work Together In Code Behind
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?
however I can only create the last image instead of 5 images.
- imageID - cat5
I assign each image unique ID.
If reader2.HasRows Then While reader2.Read Dim img1 = Convert.ToString(reader2("imgtag1")) Dim img2 = Convert.ToString(reader2("imgtag2")) Dim img3 = Convert.ToString(reader2("imgtag3")) Dim img4 = Convert.ToString(reader2("imgtag4")) Dim img5 = Convert.ToString(reader2("imgtag5")) Dim blogimg = Convert.ToString(reader2("ImageID")) Dim a As New HyperLink a.Attributes.Add("onclick", "return hs.expand(this)") a.Attributes.Add("href", "../../blog/images/" + blogimg) Dim img As Image = New Image img.ImageUrl = "~/blog/images/" + blogimg img.Width = 200 If img1 = "1" Then Dim blogimg1 As HtmlTableCell = CType(FindControl("blogimg1"), HtmlTableCell) img.ID = blogimg + "1" a.Controls.Add(img) blogimg1.Controls.Add(a) ListBox1.Items.Add(blogimg + "1") End If If img2 = "1" Then Dim blogimg2 As HtmlTableCell = CType(FindControl("blogimg2"), HtmlTableCell) img.ID = blogimg + "2" a.Controls.Add(img) blogimg2.Controls.Add(a) ListBox1.Items.Add(blogimg + "2") End If If img3 = "1" Then Dim blogimg3 As HtmlTableCell = CType(FindControl("blogimg3"), HtmlTableCell) img.ID = blogimg + "3" a.Controls.Add(img) blogimg3.Controls.Add(a) ListBox1.Items.Add(blogimg + "3") End If If img4 = "1" Then Dim blogimg4 As HtmlTableCell = CType(FindControl("blogimg4"), HtmlTableCell) img.ID = blogimg + "4" a.Controls.Add(img) blogimg4.Controls.Add(a) ListBox1.Items.Add(blogimg + "4") End If If img5 = "1" Then Dim blogimg5 As HtmlTableCell = CType(FindControl("blogimg5"), HtmlTableCell) img.ID = blogimg + "5" a.Controls.Add(img) blogimg5.Controls.Add(a) ListBox1.Items.Add(blogimg + "5") End If End While
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?
I have a function which allows me to quickly load SQL results into an SQLDataReader.
This is a very effective way for me to do this as it can be used for inserts, updates and selects very easily throughout my code.
However, I have noticed some potential memory issues with my site while using this (I keep having to do iisresets when working locally because all the pools are used up) so I am trying to use "Using" rather than "Dim" in an effort to ensure that the connection is always disposed.
I call the function in the following way:
Dim RS As SqlDataReader = SQL.Exec("sp_MyStoredProcedure " & ID) If RS.Read Then Return RS("Column_Name") End If RS.Close()
[Code].....
I now get the error "Invalid attempt to call Read when reader is closed" when calling the function on the line "If RS.Read Then".
I used the barcode example to my application and it generated barcode perfectly now I want to know that can this barcode image is readable by a barcode reader device ?
If Yes then how and if no then why and how to do ?
so i have a content page that load some content into repeater one of the repeater items is UserControl, when the page is load for the first time everything is perfect, but if i try to do postback and reload the repeater i get this error: Code:
Exception Details: MySql.Data.MySqlClient.MySqlException: Invalid attempt to Read when reader is closed.
this error is raised in the repeater databind event.
Environment is : vwd2008, asp.net 3.5, linq to sql object model, formview, stored procedure used for query.On going problem... I have a simplified page with a webform content area from a master page. The content area contains a FormView connected to an object data source thru the design view tag. The O/R designer has the Lease Table and the stored procedure in the method area.
The stored procedure selects all records from a single table. I an using the DatabaseDataContext and selecting stored procedure name which has "return SingleResult".. There is no code written; the design view was used to create everything. The stored procedure executes in VWD 2008 express tab and shows desired records. I would like to use the O/R and Linq to SQL, and objectdatasource BUT.
I'm looking for a way to make something very similar to this http://blog.jactionscripters.com/2009/05/23/introduction-of-qr-code-reader-library/ on my asp MVC 3 project.It is a QR Code Reader,not generator.I want it to be displayed on a View and serve as an input.Could anybody point me in the right direction to do this?
I've read up on this error from other posts and on other sites, but haven't found a solid resolution to the issue yet. My setup is as follows:
I have a RepositoryBase class that fields certain db calls that all repositories need to perform. In one such call, "GetSecurityGroup", it works most of the time, but will seemingly at random throw an exception with the error "Invalid attempt to call Read when reader is closed." All other Repository classes inherit from this one, and they all use the same DataContext object, which I understand isn't thread safe. Since there could be multiple calls to the DataContext object on the same page, perhaps one is using the DataContext when the next tries to do so. I'm not sure. What can I do to ensure this doesn't happen?
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.
I'm looking to integrate a bunch of RSS/ATOM sources into a feed for our intranet. This is outside my usual realm of work so I've had very limited exposure to this.
I'd like to integrate all the feeds into a single reader such that all the news items are in chronological release order.
Is this doable? Do I need a special component? Or can I make the ASP.NET integrated components do all this simply enough?
I have this code works perfectly in VB .NEt, not I am trying use the same code in ASP .NET and when it gets to this line, its doesn't move forward in the code to the line after
I am searching for bar code integration code for Asp.net webform. Looking for complete sample source with suggestion of bar code scanner company and model name to integrate.
I have a string coming from a stored procedure looks like '001234567'.
sqlCommand = new SqlCommand("csp_Bbp_OBN_GetBasePageList", BBConnection); sqlCommand.CommandType = System.Data.CommandType.StoredProcedure; sqlCommand.Connection.Open(); // Run the SQL statement, and then get the returned rows to the DataReader. accReader = sqlCommand.ExecuteReader();............
In my case, from the stored procedure I am returning the varchar, after executing and reading it I am getting the value to basePage.GrouNum which is a string. So, I don't see where it is trimming the leading zeros.
Example: GroupNumber in the table is : "001234567" BasePage.GroupNum after reading from DataReader : "1234567"
But, I do not want the leading zeros being trimmed.
I have to provide a 508-compliant version of a page for the visually impaired and it isn't practical to just modify the page. Thus, I have created a new "reader-compatible" version of the page for the handicapped. The question is how I can tell if someone is using a reader rather than a standard browser? Is there a "header" or "useragent" value typically used by these non-standard browsers that I can look for?
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;
