How To Known That Sqlconnection Is Working

Sep 23, 2004

Hello all,


Actually i want to known, is their any method or property in SqlConnection class which will return some value, so that through which we become confirm that connection has established.





Thanks in advance!

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SqlConnection.Close() Not Working

Dec 28, 2007



Hi,

This is VERY VERY simple.

Here's a code test I did place in the Form_Load of my C#.NET app.


SqlConnection cnn = new SqlConnection();

cnn.ConnectionString = "bla bla...";

cnn.Open();

cnn.Close();

cnn.Dispose();


In SQL SERVER PROFILER, the Audit Login takes place as soon as I hit the .Open()
but when I hit the .Close() OR the .Dispose() there's no Audit Logout. The Audit Logout is issued only
when I quit the application.

Is there someone to explain this behaviour ?

Thank you

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Jul 27, 2006

Public Conn As New SqlConnection("Data Source=localhost;Initial Catalog=tblUsers;UID=XXXX;pwd=XXXX")Public Conn As New SqlConnection("Data Source=XX.XXX.XX.XXX;Initial Catalog=tblUsers;UID=XXXX;pwd=XXXX")
This two commands are in my application.  I switch between the two so I can test my application.
When I put my application on the server, I use the localhost SQLCONNECTION.  The other is commented out.  However, the application continues to connect to the server with the address that is commented out.
THIS IS VERY FRUSTRATING...  HELP!!!!

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Oct 2, 2006

Hi, Someone can explain to me what happend in this situation...i have this and want to call a procedure with connection parameters protected void Button1_Click(object sender, EventArgs e)
{

SqlConnection edo = new SqlConnection();
edo.ConnectionString = "server=myserver; uid=admin; pwd=; " +
"database=name1";
SqlCommand com = edo.CreateCommand();
com.CommandType = CommandType.Text;
My_proc(edo, com);
}
protected void My_proc(SqlConnection edo , SqlCommand com)
{
try
{edo.Open();
}
catch{}
finally{ edo.close();}
}

Well what happend with the SqlCommand and SqlConnection when return to Button_Click() Are they alive? Can be used in Buton_Click like parameters for another procedure? or i have to create it again?Thx in advance..                 

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Oct 16, 2006

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Apr 28, 2007

 Can someone help me out? I am trying to establish a SQL server connection in my C# code. My C# code crasheds though. Can someone tell me what Iam doing wrong? Here is the C# code:
 
    SqlConnection myConnection = new SqlConnection(ConfigurationSettings.AppSettings["TheDividerConnectionString"]);
 Here is the connection string as defined in the web.config file:
 <connectionStrings>  <add name="TheDividerConnectionString" connectionString="Data Source=BVCOMPUTERSQLEXPRESS;Initial Catalog=TheDivider;Integrated Security=True"   providerName="System.Data.SqlClient" /> </connectionStrings>
 

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Jun 11, 2007

is their any code which can check my project for any connections which  are open and never closed.
frm 1.1,sql server 2000

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Jan 24, 2008

Would anyone ahve any ideas why when i debug this code, it stops and freezes at cn.open(); A raw sql query against the DB works in this format.
int top=10;SqlConnection cn = new SqlConnection("Data Source=blah;Initial Catalog=blah;Integrated Security=blah");
SqlCommand cmd = new SqlCommand("SELECT DISTINCT TOP (@nrows) [CustNu] FROM [Customer] WHERE [CustNu] like @term", cn);cmd.Parameters.AddWithValue("nrows", top);cmd.Parameters.AddWithValue("term", prefixText + "%");
 
List <string> suggestions = new List<string>();
cn.Open();

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Mar 13, 2008

 HiI would like to have some help for my problem.I'm trying to retreive the connectionString "MyConnectionString" from app.config using method 1 or 2 to get a connection to my DB (without any success.) --> Partial codepublic SqlConnection GetConnection()        {            // reference to System.Configuration Library is done                   1    SqlConnection Connection = new SqlConnection(ConfigurationManager.ConnectionStrings["MyConnectionString"].ConnectionString);--> thrown NullReferenceException on   Conn.Open();                   2    SqlConnection Connection = new SqlConnection(ConfigurationSettings.AppSettings["MyConnectionString"]);--> thrown InvalidOperationException ConnectionString not initialised            return Connection;        }       public Contest GetContestFromDB()        {            SqlConnection Conn = GetConnection();            Conn.Open(); ->> thrown Exception 1 or 2...Here my app.config :<?xml version="1.0" encoding="utf-8"?><configuration>  <appSettings>    <clear/>    <add key="MyConnectionString" value="Server=.SQLExpress;AttachDbFilename=D:Documents and Settings0xMesdocumentsApp_DataShopperDB.MDF;Database=ShopperDB.MDF;Trusted_Connection=Yes;"></add>  </appSettings>  <connectionStrings>    <clear/>   --> using <clear/> to avoid to load from machine.config    <add name="MyConnectionString" connectionString="Server=.SQLExpress;AttachDbFilename=D:Documents and Settings0xMes documentsApp_DataShopperDB.MDF;Database=ShopperDB.MDF;Trusted_Connection=Yes;"></add>  </connectionStrings></configuration> I'm using Visual Studio 2008 with SQLServer 2005 Express Embedded and WindowsXP SP2 .Have you got any idea ?I'm not able to sleep anymore...And I've test this code in ASP.net with the same ConnectionString in the web.config file and it works !!I'm lost.By the way, thx if ou get an answer  ww4ss

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Aug 24, 2004

Hi
I have the next simple code, what do i have to change to match it to SQL?
The code:
Sub Page_Load (Source As Object, E as EventArgs)
dim strConn as string =("Provider=" & "Microsoft.Jet.OLEDB.4.0;" & _
"Data Source =C:webspacesegolforferaforfera.co.ildbguestbook.mdb")

Dim MySQL as string = "SELECT Name, EMail, URL, Comment FROM Guestbook"
Dim MyConn as New OleDBConnection (strConn)
Dim Cmd as New OleDBCommand (MySQL, MyConn)
MyConn.Open ()
rptGuestbook.DataSource = Cmd.ExecuteReader(System.Data.CommandBehavior.CloseConnection)
rptGuestbook.DataBind()
End Sub
Thank's and have a good day.

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Jul 17, 2006

I have a database for each of my customers and want to connect to a database depending on who is logged in.
all my users have their database name in the user profile.
how can i use the database name in the user profile to change the initial catalog to connect to aaother database?
 
thanks
 
 

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Nov 16, 2006

Hi there,  I'm not sure if the way I handle SqlConnection in my apps is the most performant one.So my apps use db heavily and there are loads of classes with methods like 1 using (SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["myConn"].ConnectionString))
2
3 {conn.Open();
4 // more code here
5 }
6
7
 As I use using the connection is closed and the object is disposed when leaving the code block.I know that the connection is taken from a pool and when closed it returns to the pool as though I'm not sure if it is better to have one "global" SqlConnection objectand to use that object for all classes or most of them. What about the ConfigurationManager, doesn't it slow down the performance as well when I'm accessing the ConnectionString value thousands of times?I hope someone can point out the issues.Many thanks in advance, Limbic

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Jan 3, 2007

I need some information on sqlconnnection object.  I see it referenced in some exercises, and also displayed in the toolbox on some articles, but I'm running .net 2.0 and I have no sqlconnection in my toolbox, but more importantly, I can not seem to drop the data connection from my database/server explorer to my form to create a sqlconn object.   When I highlight the data connection (in my case it's machinenamesqlexpress.pubs.dbo)  and try to drag it - it immediately goes to a NO icon (that is a circle with a slash thru it) and I can not drop it onto my form.  I can see the database with no problems in explorer.
 I have been able to create a sqlconnection programatically:
Dim sqldatasource1 As SqlConnection = New SqlConnection()
sqldatasource1.ConnectionString = "Data Source=localhostsqlexpress;Initial Catalog=pubs;Integrated Security=True"
but how can I create it on my form??  I would appreciate any help on this matter.
 
(p.s. I am using VWD 2005 and SQLExpress)
 

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Jul 30, 2007

I have created an aspx page that uses the SqlConnection class to pull data from Microsoft CRM’s database, and we have placed this aspx inside CRM’s directory on the server so that it uses the same integrated security that CRM uses. This works fine on our test environment but on our live environment the Sql connection fails with the exception: "Not associated with a trusted SQL Server connection"
This is probably because our test CRM server has the database on the same machine as the web server, but the live environment has the database and the web server on separate machines.
So my question is how can I create an aspx page that takes the integrated security credentials that the user used to log into the website and uses them to access data from a database on a seperate machine?

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Oct 26, 2007

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Dec 18, 2007

I am working on a set of webforms that insert user data into a set of db tables. 
I set up a test of an approach using northwind and I'm having trouble getting the insert to work.   When I open the form, input the name and phone, and submit there is no error, but no record inserted into the Shippers table. 
You can see one of my approaches in the ASPX code.  I don't like having to do the select in order to do the insert -- so that's commented off. 
I'm stuck.  Thoughts about what I'm missing appreciated...
 
Ray
 ASPX code.
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default66a.aspx.cs" Inherits="pages_audit_Default66a" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server"><title>Untitled Page</title>
</head><body>
<form id="form1" runat="server">
CompanyName:
<asp:textbox id="txtCompanyName" runat="server" /><br />
Phone:<asp:textbox id="txtPhone" runat="server" /><br />
<br />
<asp:button id="btnSubmit" runat="server" text="Submit" onclick="btnSubmit_Click" />
<br />
<br />
<br />
<br />
<asp:Label ID="awesomelbl" runat="server" Text="Label"></asp:Label><br />
<br />
<!--
<asp:sqldatasource id="SqlDataSource1" runat="server" connectionstring="<%$ ConnectionStrings:NorthwindConnectionString %>"
insertcommand="INSERT INTO Shippers(CompanyName, Phone) VALUES (@CompanyName, @Phone)" ProviderName="System.Data.SqlClient" SelectCommand="SELECT * FROM [Shippers]">
<insertparameters>
<asp:controlparameter controlid="txtCompanyName" name="CompanyName" />
<asp:controlparameter controlid="txtPhone" name="Phone" />
</insertparameters>
</asp:sqldatasource>
--></form>
</body>
</html>
c Sharp code
using System;
using System.Data;
using System.Data.SqlClient;
using System.Data.Sql;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
public partial class pages_audit_Default66a : System.Web.UI.Page
{protected void Page_Load(object sender, EventArgs e)
{
}protected void btnSubmit_Click(object sender, EventArgs e)
{SqlConnection con = new SqlConnection("Data Source=Chilibowl;Trusted_Connection=yes;DataBase=Northwind");
SqlCommand cmd = new SqlCommand("INSERT INTO [Shippers] ([CompanyName], [Phone]) VALUES (@CompanyName, @Phone)");SqlParameter cnameparam = new SqlParameter("@CompanyName", txtCompanyName.Text); SqlParameter phnparam = new SqlParameter("@Phone", txtPhone.Text);
cmd.Parameters.Add(cnameparam);
cmd.Parameters.Add(phnparam);
try
{
con.Open();if (cmd.ExecuteNonQuery() > 0)awesomelbl.Text = "successful insert";
}
catch
{
//handel
}
finally
{
con.Close();
}
}
}
 

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Jan 4, 2008

An error has occurred while establishing a connection to the server.  When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified)
this problem occured when i rum my program which contain database connection
any one there can help me please?

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Nov 12, 2003

Hi all,
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Jan 22, 2004

Hi,

How much of a performance difference is there between connecting to SQL Server 2000 using OleDbConnection or using SqlConnection?

The reason I'm asking is I am taking on the task of updating an older program that uses a Access Database to use SQL Server, but it has a Database Utility class that uses OleDbConnection. I'm just debating whether it would be worthwhile to upgrade the class to use the SQL objects rather than Oledb. Program does a lot of update and insert of invidual records, and a few select statements that usually return from 1 to 2000 records up to a maximum of 50,000 records

Thanks

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Mar 2, 2004

I've an web app with impersonate windows authentication. IIS uses Windows authentication for this app & anonymous authentication is turned off.
This app have connectionString in Web.config where Windows autentication (SSPI) to SQL Server 2000 took place.
Now I've a piece of code:

public class SiteParameters
{
public static SqlConnection Connection
{
get
{
SqlConnection conn;
try
{
conn = new SqlConnection(ConfigurationSettings.AppSettings["connectionString"]);
if(conn.State != ConnectionState.Open)
conn.Open();
}
catch(Exception)
{
conn = null;
}
return conn;
}
}
}

No comments is needed, think...
Now, I'm going to use it in following way:

SqlConnection conn = SiteParameters.Connection;
SqlDataAdapter dta = new SqlDataAdapter();
DataSet ds = new DataSet();

SqlCommand sqlSelect = new SqlCommand("spPlanTransportSelect", conn);
sqlSelect.CommandType =CommandType.StoredProcedure;

dta.SelectCommand = sqlSelect;
dta.Fill(ds, "PlanTransport");

if(conn.State != ConnectionState.Closed)
conn.Close();
return ds;

It looks good & works good... on local machine only :( When I run app locally (doesn't matter if I call it by http://localhost/app, http://127.0.0.1/app or http://10.50.2.51/app I take proper data from database.
But when my buddy from another comp (e.g. 10.50.2.52) uses URL http://10.50.5.51/app he receives an error in line dta.Fill(ds, "PlanTransport");, but in fact conn variable is null & he receives "yellow" screen where is written that NT ANONYMOUS user is trying to log on to database...
It looks strange for me. Any tips?

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Jul 10, 2004

I tried connected my web form with SQL server by drag a table from Server Explore onto the WebForm1.aspx. page. It created a sqlConnection1 and a sqlDataadapter object, but theses two objects seem not work. There is nothing displayed on property window and when I right-click sqlDataAdapter there is no "Preview Data", "Configure Data Adapter" and "Gnerate Dataset" items displayed as well.
I used this SQL server on Windows Form, it worked very well. Could anyone please help me figure it out. Thanks!

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Oct 28, 2004

Hi !!

I have a code that runs from a different machine and a different site and i am facing a problem that i can not log in to the database.I installed SQL Server on my machine and I created a user "fadila" and SQL Server Authentication and the password is "fadil1977" and the database is "otters" and it is installed as tables and stored procedures but there is not data on these tables.

I used the method provided in the code so, i only change the "connStr" in one place rather than in 20 places and my code is as below. Can you please Help me to connect to the database. I Really..Really appreciate it if you help me to solve it as it causeing me a big head-ache and still get the error message "SQL Server does not exist or access denied" .. please help!!!!




Friend Shared ReadOnly Property connStr() As String

Get

Return String.Format( _

"Data Source={0};Initial Catalog=Otters;User ID=fadila;Password=fadil1977", _

DatabaseMachine)

End Get

End Property

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May 18, 2005

If i use the TimeTracker app from the starter kit suite and I enter my SQL connection in the web.config file it works fine,
 
If i build a simple app with just a sqladapter, sqlconnection and dataset control then enter in the page_load procedure
 
sqlDataAdater1.fill(dataset11)
datagrid1.databind()
It keeps giving my errors see below:  I created a connection with the sqlconnection control and used the same userid and password I used in the time tracker stater kit's web config file which works - I have no idea what is going on
 
*** is it better to create the sqlconnection control first then create the sqladapter or vise versa.
Server Error in '/WebApplication2' Application.


Login failed for user 'IssueTrackerUser'.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.Data.SqlClient.SqlException: Login failed for user 'IssueTrackerUser'.Source Error:



Line 55: Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Line 56: 'Put user code to initialize the page here
Line 57: SqlDataAdapter1.Fill(DataSet11)
Line 58: DataGrid1.DataBind()
Line 59: Source File: c:inetpubwwwrootWebApplication2WebForm1.aspx.vb    Line: 57 Stack Trace:



[SqlException: Login failed for user 'IssueTrackerUser'.]
System.Data.SqlClient.ConnectionPool.GetConnection(Boolean& isInTransaction)
System.Data.SqlClient.SqlConnectionPoolManager.GetPooledConnection(SqlConnectionString options, Boolean& isInTransaction)
System.Data.SqlClient.SqlConnection.Open()
System.Data.Common.DbDataAdapter.QuietOpen(IDbConnection connection, ConnectionState& originalState)
System.Data.Common.DbDataAdapter.FillFromCommand(Object data, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior)
System.Data.Common.DbDataAdapter.Fill(DataSet dataSet, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior)
System.Data.Common.DbDataAdapter.Fill(DataSet dataSet)
WebApplication2.WebForm1.Page_Load(Object sender, EventArgs e) in c:inetpubwwwrootWebApplication2WebForm1.aspx.vb:57
System.Web.UI.Control.OnLoad(EventArgs e)
System.Web.UI.Control.LoadRecursive()
System.Web.UI.Page.ProcessRequestMain()



Version Information: Microsoft .NET Framework Version:1.1.4322.573; ASP.NET Version:1.1.4322.573
 

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Sep 8, 2005

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Jan 19, 2006

Hello,
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Mike

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Aug 18, 2006

Hi all,

I'm trying to connect to my SQL SERVER 2000 database via Sqlconnection command with the code below,do I need to do something else to make sure the database is really opened ..I keep getting error at

conn.Open(); which I dont know what do about ..

any help will be really appreciated



using (SqlConnection conn = new SqlConnection("Server=" + dbServer+";Database="+dbDatabase+";"))

{

conn.Open();

SqlCommand cmd = conn.CreateCommand();

cmd.CommandText = "SELECT * FROM LOCATIONS";

cmd.ExecuteNonQuery();

conn.Close();

}





thanks

Alaa M

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Dec 6, 2006

I am having a hard time finding information about this error
online.  I was hoping someone could help me with it.  I am working with
MS Visual Studio 2005.  The SQL Server version is 2000.  The error
bellow says I am trying to connect to SQL 2005.  Also, I can use MSVS
Server Explorer and SQL Server Enterprise Manager to connect to the
database.Here is my code:
 
imports System.data
Dim Connect As New SqlClient.SqlConnection
Dim Adapter As New SqlClient.SqlDataAdapter
Dim St As New DataSet
Dim ConnectString As String
ConnectString = "Data Source=MANDB01;Initial Catalog=MANCON_WEB;Integrated Security=True"
Connect.ConnectionString = ConnectString
Adapter.SelectCommand = New SqlClient.SqlCommand("select * from item_cat1", Connect)
Adapter.SelectCommand.Connection.Open()
Adapter.Fill(St)
Connect.Close()  
The browser is reporting this error: An error has occurred while establishing a connection to
the server.  When connecting to SQL Server 2005, this failure may be
caused by the fact that under the default settings SQL Server does not
allow remote connections. (provider: Named Pipes Provider, error: 40 -
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Jan 4, 2007

Hi there,
I saw more than a dozen on this topic, even the problems has been solved.  But there are no postings on how to solve this issue.
In the development environment we're using SQL 2000 and in testing environment we're using SQL 2005.  I have no issue in the development environment, but unable to connect to SQL 2005 in the test environment.  Can anyone provide some suggestions?
web.config I got the following at works with SQL  2000.
 <appSettings>
<add key="MyConnection" value="Integrated Security=True;User ID=x;password=y;Initial Catalog=Fruit;Data Source=SQL2005DEV"/>
</appSettings>
After the user click on the submit button, I got the following code.
Dim conStr As String
ConStr = ConfigurationManager.AppSettings("MyConnection")
 TIA
Steve
 

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Apr 13, 2007

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Jul 31, 2007

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'dim connorthwind as New SQLConnection ("Server=" & strservername & ";UID=" & strUsername & ";PWD=" & strPassword & ";database=master")                                 See below for my code:
<%@ Page %><%@ import Namespace="System.Data.SqlClient" %><%@ import Namespace="System.Data" %><script runat="server">
    Sub Button_Click( s As Object, e As EventArgs )   dim conNorthwind as New SqlConnection( "Server=dbtest1;UID=cbtest;PWD=password3;database=master" )          Dim strInsert As String         Dim cmdInsert As SqlCommand             cmdInsert = New SqlCommand( "sp_password_sec", conNorthwind )         cmdInsert.CommandType = CommandType.StoredProcedure         'cmdINsert.Parameters.Add( "@loginname", txtname.text )         cmdINsert.Parameters.Add( "@oldpwd", Password.text )         cmdINsert.Parameters.Add( "@newpwd", txtnew.text )         conNorthwind.Open()         cmdInsert.ExecuteNonQuery()         conNorthwind.Close()              End Sub
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