What Is The Difference Between DataSet And DataReader
Dec 1, 2010What is the difference between DataSet and DataReader in Asp.net with Example..
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Similar Messages:
Datareader Vs Dataset - Get The Number Of Rows From The Datareader?
Nov 15, 2010I'm having a method that exports content from the database to excel files. The method taks as paramaters a DataReader param and a int param - the number of rows. For the number of rows i'm using a dataset, wich i fill using the same query as for the datareader. So I'm executing it twice... Is there a way I can avoid that? get the number of rows from the datareader?
View 1 RepliesDataSource Controls :: How To Convert Datareader To Dataset
May 11, 2010Any one can suggest a method to convert Datareader to dataset or any alternate method
View 7 RepliesADO.NET :: DataReader Or DataSet To Read An Output Parameter Not Essential?
Nov 4, 2010I always thought we had to use a DataReader or a Dataset to read a given SQL data but i realized that it is not necessary to use them to read an SQL Output Parameter(im not a SQL expert).
View 1 RepliesForms Data Controls :: Binding Dropdown List Using Dataset Or Datareader?
Jan 25, 2011- i have two drop down lists- ddl_SelectClient, ddl_SelectApplication
- when a client is selected in ddl_SelectClient, i have to show the list of the clients applications in ddl_SelectApplication
- i have written the below code in the ddl_SelectClient_SelectedIndexChanged routine to do the same
- i am getting the error("Unable to evaluate expression because the code is optimized or a native frame is on top of the call stack") in the catch block when the ddl_SelectApplication gets binded
[Code]....
C# - Already An Open DataReader Associated With This Command - When I'm Not Using Datareader
Jul 28, 2010I am getting an error that an open DataReader associated with this Command, when I'm not using datareader(though probably executereader() is the same thing) how would I close this if I don't have a datareader present?
using (SqlConnection conn = new SqlConnection(ConnectionString))
{
SqlCommand cmd = new SqlCommand("spSelectAllTypes",conn);
cmd.CommandType = CommandType.StoredProcedure;
[code]...
I just want to be able to databind a bunch of dropdownlist in one open connection. (before I had multiple open and closes for each control)
DataSource Controls :: Difference Between Typed Dataset And Data Source Controls?
Nov 1, 2010I'm new to this community and got newbie question, briefly in data access in asp.net what is the difference between accessing dataset using typed Dataset and using data sources controls like SQL data source control ...? As I noticed that using data source controls is much easier, but it allows only one data access method i.e. only one query... am I right with that....
View 1 RepliesADO.NET :: FlexCel: Entity Framework -> DataSet / Convert Data In Gridview To A Virtual DataSet?
Mar 31, 2011In my project I work with Entity Framework (LINQ to ENTITY). I only have ADO.NET Entity Data Model and a DAL (Data Access Layer). I also get the data due a WCFClientService. I have a gridview that needed to be exported in Excel.
FlexCel is a tool for generating Excel files based on a template. The only thing I see in demo's is that they work with DataSets.
Is there a way to convert the data in my gridview to a virtual DataSet?
I've written the following method to get the data:
[Code]....
SQL Reporting :: How To Add Stored Procedure Result Set Columns To Typed Dataset And Dataset To RDLC File
Jan 9, 2011Till now I used to design RDLC file before and assigned typed dataset table columns.Report processing mode is local. But now my stored procedure returns different columns based on condition i.e columns are not fixed every time. Now I need to add that columns to typed dataset and dataset is assigned to RDLC file. So dataset and RDLC files are create dynamically based on stored procedure result set columns.
View 1 RepliesVS 2008 - Uploading Excel Data To Dataset, Then DataSet To SQL Server?
Jan 18, 2010What I am thinking is this? Is it possible for me to upload the data from an excel file to dataset of my application first, so that the user can view the data in a gridview to review it first, before the user strike the save button, to save it in the database. So, that in case there is a problem, the gridview will high light all the data with an error. So the user can easily pull out the excel and correct the data before saving it in the database.
View 4 RepliesDataSource Controls :: How To Connect Typed DataSet Using DataSet.XSD File
Feb 4, 2010Today I am facing the problem with Typed DataSet using DataSet.XSd file, And How to fetch, Delete and Update the Database through Dataset.xsd file.
View 9 RepliesDataSource Controls :: How To Copy Required Row In Dataset To A New Dataset
Mar 5, 2010how do i copy required row in dataset to a new dataset. i have bind a xml into a dataset and i need to display say row 3 to 5 only so i do a for loop but i have encounter problem when trying to copy the rows to a new dataset.
do i have to write the xml to datatable and bind it to dataset and from there copy over ?
.net - Going Through A DataReader Twice?
Mar 30, 2011I have the following code which does what it's supposed to do:
objSQLCommand = New SqlCommand("select * from table1", objSQLConnection)
objSQLCommand.Connection.Open()
objSQLDataReader = objSQLCommand.ExecuteReader()[code]....
But I need to loop through the objSQLDataReader 1 more time. How would I do that?
How Can Serialize A Datareader In Webservices
Mar 23, 2010how we can serialize a datareader in webservices.
View 1 RepliesHow To Serialize The DataReader In Webservices
Mar 20, 2010How to serialize the DataReader in webservices in asp.net?
View 4 RepliesADO.NET :: Fetching A Single Row From Sql Datareader?
Aug 17, 2010Lang-ASP.net using C# and Sql server 2005
i m trying to use the sql datareader to fetch a single row at a time i wanna know can we use it to fetch a single row at a time or not if yes i m unable to figure out what i m doing wrong here bcus its not returning any data
[Code]....
of course data is present in my table bcuz when i m using dataset i m able to the return the single row throuugh dataset
ADO.NET :: Converting Datareader To A List?
Feb 17, 2011In C#.I have a list<object>.
I want to convert any datareader result (with data) to a list of objects.
How can I do that?
ADO.NET :: Can't Pass DataReader Values
Nov 1, 2010Why can I not call the global variables CatCode and CompanyName which are equated in the first procedure GetCompanyCatID And use their new values in the second procedure UpdateCompanyCounts as parameter values. When I hard code them code their values at the end of the GetCompany CatID procedure the following procedure updates properly.
string CatCode; - delcared global
string CompanyName; - delcared global
protected void GetCompanyCatID()
{
LinkID2 = Request.QueryString["linkid"].ToString();
string L_ID = LinkID2;
SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["ConnectionString001"].ConnectionString);
SqlCommand cmd = new SqlCommand("GetCID", con);
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.AddWithValue("@L_ID", L_ID);
try
{
con.Open();
using (SqlDataReader reader = cmd.ExecuteReader())
{
while (reader.Read())
{
if (reader["CG_ID"] != System.DBNull.Value)
CatCode = (string)reader["CG_ID"];
CompanyName = (string)reader["CG_Name"];
}
}
}
catch (SqlException exc)
{ }
finally
{ con.Close(); }
// ******* HARD CODED to test below update procedure, it works. When commented out the following update procedure does not update.
CatCode = "55555"
CompanyName = "Test";
UpdateCompanyCounts();
}
protected void UpdateCompanyCounts()
{
LinkID2 = Request.QueryString["linkid"].ToString();
string L_ID = LinkID2;
string CatCode2 = CatCode;
string CompanyName2 = CompanyName;
// string CatCode2 = "23456";
// string CompanyName2 = "TEST";
SqlConnection con2 = new SqlConnection(ConfigurationManager.ConnectionStrings["ConnectionString001"].ConnectionString);
SqlCommand cmd2 = new SqlCommand("UpdateCatCounter", con2);
cmd2.CommandType = CommandType.StoredProcedure;
cmd2.Parameters.AddWithValue("@L_ID", LinkID2);
cmd2.Parameters.AddWithValue("@CG_ID", CatCode2 );
cmd2.Parameters.AddWithValue("@CG_Name", CompanyName2 );
try
{
con2.Open();
cmd2.ExecuteNonQuery();
}
catch (SqlException exc)
{
// ErrorBox.Text += string.Format("Error: {0}<br/>", exc.Message);
}
finally
{
con2.Close();
}
}
.net DataReader Execution Technique
Jan 3, 2010I heard that DataReader works on forward only readonly fashion and at a time it willread a single record.Suppose when i execute the below code
SqlDataReader reader=cmd.ExecuteReader();
gv1.DataSource=reader;
gv.DataBind();
How the does the gridview populate all records?.As the reader is capable of reading one row per read,I thought only the last row is available for GridView to display.
C# - DataReader Already Open When Using LINQ?
Apr 22, 2010I've got a static class containing a static field which makes reference to a wrapper object of a DataContext.
The DataContext is basically generated by Visual Studio when we created a dbml file & contains methods for each of the stored procedures we have in the DB.
Our class basically has a bunch of static methods that fire off each of these stored proc methods & then returns an array based on a LINQ query.
Example:
public static TwoFieldBarData[] GetAgesReportData(string pct)
{
return DataContext
.BreakdownOfUsersByAge(Constants.USER_MEDICAL_PROFILE_KEY, pct)
.Select(x => new TwoFieldBarData(x.DisplayName, x.LeftValue, x.RightValue, x.TotalCount))
.ToArray();
}
Every now and then, we get the following error:
There is already an open DataReader associated with this Command which must be closed firs
This is happening intermittently and I'm curious as to what is going on. My guess is that when there's some lag between one method executing and the next one firing, it's locking up the DataContext and throwing the error.
Could this be a case for wrapping each of the DataContext LINQ calls in a lock(){} to obtain exclusivity to that type and ensure other requests are queued?
C# - Check A Datareader For Null?
Feb 10, 2011I have an aspx page which allows a user to submit modified entries into the database, but when the user clicks Submit to fire the stored procedure I want to first run a check to see if a modified row with the same relationship exists.I am passing the results of the following query:
SELECT SwitchRoom.ModifiedID FROM SwitchRoom WHERE
SwitchRoomID = @ChkSwitchRmID", constring;
into a DataReader to determine if that relationship exists.I need it to determine whether the reader returns NULL to allow the procedure to execute, if it doesn't, then don't allow the user to save the information.I've tried the following:
if (dbreader = NULL)
{
Fire Procedure
}
else
{
"Error Message"
}
and I've even tried passing the reader into a datatable and running it against that without any luck.
DataSource Controls :: Use A DataReader With SQL?
Mar 29, 2011I have put a SQLDataSource on my page and everything is adjusted and it works properly. I read an article
here which was indicating that you can use a DataReader in order to get data from sqldatasource, but it doesn't say how, the only thing that is said is to use DataSourceMode property in order to adjust it for a DataReader.
Filling Datatable Using Datareader?
Nov 3, 2010see i want to fill datatable using datareader.
i have created object like this
SqlDataReader dr=cmd.ExecuteReader();
if(dr.HasRows)
{
}
C# - Filling An Arraylist From A Datareader?
Mar 15, 2011I have a problem with how to fill an array list from a data reader
string queryDTL = " SELECT * FROM tbl1 ";
connection.Connect();
cmd = new OracleCommand(queryDTL, connection.getConnection());
dr_DTL = qcmd2.ExecuteReader();
ArrayList RecordsInfo = new ArrayList();
while (dr_DTL.Read())
{
RecordsInfo = dr_DTL["number"].ToString();
}
The problem is the datareader contain alot of info other than the number but I don't know how to put them in their correct position.
Forms Data Controls :: Detailsview Row Update / Creating Dataset, Getting Data From Sql With Adaptor And Filling Into Dataset Object
Dec 21, 2010I have a detailsview, template as follows:
[Code]....
Codebehind: creating dataset, getting data from sql with adaptor and filling into dataset object, then setting detailsview's datasource.
I add 2 button to above template to able to edit data at asp page, and added event handlers:buttons:
[Code]....
My question is, what to do inside the detailsview update event function to able to edit and update data. My method can be wrong too.