Visual C# Cannot Connect To SQL 2005 Express

May 2, 2006

Hi,

In Visual C# Express, I right click on my solution and select Add, new item, and then choose an SQL database. I get the error:

Connections to SQL Server files (*.mdf) require SQL Server Express 2005 to function properly. Please verify the installation of the component or download from the URL: http://go.microsoft.com/fwlink/?LinkId=49251

I completely uninstalled all of the beta Express products I had and reinstalled SQL Server 2005 Express first, which seems to have installed ok. Then I reinstalled Visual C# Express, but still have the same problem.

This is happening on my home pc running Windows XP Home sp2. I successfully got sql working with VC# Express at work on my WinXP Pro system.

Thanks a bunch!

Ron

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Can't Connect To SQL Server 2005 Express Through Visual C# App

Jun 11, 2006

I've installed SQL server 2005 Express and set up a database called StockData. I'm running the following code in a visual C# windows app to test the connection:

System.Data.Sql.SqlDataSourceEnumerator instance = System.Data.Sql.SqlDataSourceEnumerator.Instance;

DataTable tblSource = instance.GetDataSources();

string strSource = tblSource.Rows[0][0].ToString() + "/" + tblSource.Rows[0][1].ToString();

SqlConnection sqlConn = new SqlConnection();

sqlConn.ConnectionString = "Data Source=(local);Initial Catalog=StockData;Integrated Security=true";

sqlConn.Open();

I have verified that the SQLEXPRESS service is up and running. The strSource variable shows the machine and SQLEXPRESS instance name when I step through, so I know that the application is recognizing the service. But when I get to the "sqlConn.Open()" line, I get the following error message:

Message="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 - Could not open a connection to SQL Server)"
Source=".Net SqlClient Data Provider"
ErrorCode=-2146232060

Can anyone tell me what I'm doing wrong here? This is driving me nuts. Thanks.


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Visual Studio 2005 Unable To Connect To SQL Server Express 2005

May 26, 2008

Hi,
I have VS Pro 2005 and SQL Server Express 2005 installed on an XP Pro machine. When using VS 2005, in the 'Server Explorer' window I can see and attach to two SQL Server databases that I have set-up. But if I attempt to access the same databases from withn the 'Solution Explorer' window I get the following dialog box message,

"
Required Component Missing (Dialog box heading)

Connections to SQL Server Files (*.mdf) require SQL Server Express to function properly. Please verify the installation of the component or download from the URL: http://go.microsoft.com/fwlink/?LinkId=49251
"

I have uninstalled and then reinstalled both VS 2005 and SQL Server Express twice but it has helped.

I don't understand why I'm getting this error because all of the server configuration tools and connection utilities seem to work fine but VS say's that SQL Server Express is not installed.


Thanks,

CLN

P.S.
I had another application that required MSDE 2000A to be installed. When I removed the other application I also removed MSDE 2000A and that's when the problem began.

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Apr 11, 2006

I've downloaded and installed both of these (VWD installs both) and have been trying to run through the walkthrough of setting up a web application which supports membership. However, no matter what I do I invariably get errors like the following:


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) (Microsoft SQL Server, Error: -1)
I'm concerned why VWD and VSQL express versions don't run correctly out of the box (so to speak). I'm not an expert on configuring these services -- but that's the point of offering these tools to hobbyists: So we can learn about how to make some of these great applications using MS tools.
My configuration::


Windows XP SP2 -- clean machine as of about a month ago, never had any dev tools, web servers, or the like on it.

IIS is installed and the service says its running

VSQL and VWD express versions installed (no errors on installation)

SQL server service indicates it is running

.Net 2.0 framework installed (no errors on installation)

Note: I've tried installing on two separate machines. Obviously I'm missing something fundamental.

Would someone please help me go through the million things I [apparently] need to do to configure all these tools so I can get on to actually coding up my first web application? If this is documented somewhere, all I can say is I tried to find it but it certainly wasn't obvious.

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Mar 22, 2007

I've installed both SQL Server Express and Visual C++. I'm trying to connect to a SQL database, but keep receiving various errors. This is what I've done so far.

1. Eventually, I used the surface area manager to allow a remote connect.

2. The server and my development environment exist on the same virtual machine, I created with Virtual Pc.

3. I'm running Vista as my operating system.

4. My Data Source wizard looks like this:

Data Source: MS SQL Database File

Database file name: C:Program FilesMicrosoft SQL ServerMSSQL.1MSSQLDataETS.mdf

If I use Windows Authen I get the following error:

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If I use SQL Server Authen I get the following error:

Failed to generate a user instance of SQL Server. Only an integrated connection can generate a user instance. The connection will be closed.



I'm new to this. I really would like help in knowing what these errors mean and how to get pass them. But this is very, very, very, frustrating. First off, there was no instructions on allowing remote connections. I stumble upon it myself. Giving permission to the file, stumble upon myself. I spent 4 days with a You do not have permission to open file error. Didn't realize I didn't have permission.

I need a step by step on what to do. I can be emailed at gregw.energytaxsolutions@hotmail.com if need be.



If this is in the wrong place, moderator please move to the correct area.

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I've done the following:

Followed advise on How to: Configure Express to accept remote connections

Retrieved port_address from SQL Server Configuration Manager (i.e. SQL Server 2005 Network Configuration > Protocols for SQLEXPRESS > Select TCP/IP Protocol name > RT click on Properties > IPALL - TCP Dynamic Ports port_address

netstat -ano | findstr "port_address" shows the following

TCP 0.0.0.0:2247<-port_address 0.0.0.0:0 LISTENING 1620

Attempted to connect to SQLEXPRESS service using dynamically assigned port_address with this command

F:Program FilesMicrosoft SQL Server90ToolsBinn>SQLCMD -S .sqlexpress,2247

HResult 0x2AF9, Level 16, State 1
TCP Provider: No such host is known.
Sqlcmd: Error: Microsoft SQL Native Client : 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..
Sqlcmd: Error: Microsoft SQL Native Client : Login timeout expired.


I can successfully connect to SQLEXPRESS using SQLCMD with flags
- S .sqlexpress
and
-S np:\:\.pipeMSSQL$SQLEXPRESSsqlquery (named pipes)

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Questions:

Does VWD local web server require configuration?

Is this a Named Pipe or TCP/IP configuration problem? Should Shared Memory be disabled?

Should I give up on VWD local webserver and install IIS instead?

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ADDITIONAL INFORMATION:

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In a command window, I can query the state of LocalDB an "info" parameter:

C:Program FilesMicrosoft SQL Server110ToolsBinn>sqlLocalDB info
SportsStore
TestOfLoc
v11.0

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hi

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I chkd the default settings and it allowed remote connections. I also have default instance for the sql server

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thanks
athi

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Private Sub UpdateMemberTable()

Me.Validate()

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Me.TblMembersTableAdapter.Update(Me.ChurchFamilyDataSet.tblMembers)

Me.TblMemberDependentsBindingSource.EndEdit()

Me.TblMemberDependentsTableAdapter.Update(Me.ChurchFamilyDataSet.tblMemberDependents)

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Code Snippet

An error has occurred while establishing a connection to the server.
When connecting to the 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 - Could not
open a connection to the SQL Server)
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Code Snippet

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