Error In Connecting Database Using C#
Sep 15, 2011
I m facing an error in connecting my Access Database using ASP.NET. I have placed the below code in Web.Config
Code:
<connectionStrings>
<add name="ConnString" connectionString="Provider=Microsoft.Jet.OLEDB.4.0;Data Source=|DataDirectory|PerformanceDb.MDB"/>
</connectionStrings>
And used below code for connection
Code:
OleDbConnection myConn = new OleDbConnection(System.Configuration.ConfigurationManager.ConnectionStrings("ConnString"))
but it gives error
Non-invocable member 'System.Configuration.ConfigurationManager.ConnectionStrings' cannot be used like a method
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Dec 6, 2010
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I'm getting the following error when attaching to my database on line. I'm not sure what the issue is as I've been able to connect in the past without any issues and there haven't been any changes to my connection string. Here is the error and my webconfig.
[Code]....
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Aug 22, 2010
I upgraded a Website to use ASP.NET 4.0, from 3.5. This involved setting it up on a different server, with the same hosting company. I'm using a shared hosting plan on Windows Server 2008.
Since migrating, it gives an error message when I try to login to the site:
A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified)
I'm using the same connection string as I did in the old version, which always worked. I also changed the permissions for the database to allow connections from the redeployed Website, via the host's control panel.
I have searched the web.config, and the source for the site, and I haven't been able to find a connection string that looks incorrect.
I've contacted the host about it, in case it is a configuration issue on their side.
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Dec 9, 2010
My website is [URL] (access there to see error, please) When I was testing in VS2010, it was connecting to the DB because I set permissions READ/WRITE on my computer to ALL. If I put restrictions, VS2010 couldn't just connect to them. Well, I deployed my DB on the server of my website, and I'm not able to access it.
My connection string:
connection = New SqlConnection("Data Source=.SQLEXPRESS; Integrated Security=True;AttachDbFilename=|DataDirectory|Visitas.mdf")
I think I'm getting these errors because my server hasn't permission to access the database.
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Apr 4, 2010
I wish to connect to an access database within visual web developer. I created the connection string:
<connectionStrings>
<add
name="ConnectString"
connectionString="Provider=Microsoft.Jet.OLEDB.4.0;Data
Source=C:foldersfilename.mdb"
providerName="System.Data.OleDb"/>
</connectionStrings>
And I refer to the connection like so:
<asp:sqlDataSource
ID="SqlDataSource3"
runat="server"
ConnectionString=
"<%$ ConnectionStrings:ConnectString %>"
ProviderName="<%$ ConnectionStrings:ConnectString.ProviderName %>"
SelectCommand="
but I recieve the error
Keyword not supported: 'provider'.
Description: An unhandled exception occurred during the execution of the current web request. review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.ArgumentException: Keyword not supported: 'provider'
what am I supposed to do to make this connection work! I have always done it in dreamweaver with no problems, but I have to use Visual Web Developer for this project.
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Jun 6, 2010
The problem i have would be im getting - 'System.Data.SqlClient.SqlException: Login failed for user 'discountb1'.' error message. my connection string in ASP was the following
"DRIVER={MySQL ODBC 3.51 Driver}; SERVER=CIServer12; DATABASE=BathroomBitsb1; UID=discountb1;PASSWORD=******; OPTION=3"
now just for my simple asp.net page i'm using the following
Code]....
i believe i have done everything right, but its obviously not the case.
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Jun 3, 2010
Well it's finally time to stop ignoring my unit's need for reports. I keep coming to dead ends. I gave up the crystal reports idea, and ssrs seems a little easier. Now the problem is that I'm creating a report locally on my laptop, then will change the connection string, upload it to my server and have it run against an identical database on the server.
I'm using SQL Server Express locally, and when I try to create a dataset (using the wizard), I can see the tables, but when I try to add one, I get an error message "Could not retrieve schema information for table or view". I looked up this error and there isn't much useful info on it. I guess it some bug when trying to use SS Express? Is there a work around for this? Can I create the report programmatically? Should I use a different kind of reporting service?
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Jan 17, 2011
I come from a coldfusion background, where setting up a connection to a database (Oracle, MYSQL SQL Server etc) was was easy as filling in a few fields in the datasource screen in the Coldfusion Administrator web app.
Then in the web application to connect to the database I would use <CFQUERY datasource="oracledb" name="test"> and in the body of the application I would write my SQL query and display the results of this query in a <CFOUTPUT>#variablename#</cfoutput> block of code, or to insert data into a db table I would use the
<CFQUERY datasource="oracledb" name="insertdata">
INSERT INTO table (columnname, columnname2, columnname3)
VALUES (
<cfqueryparam cfsqltype="cf_sql_number" value="#columnname#">,
<cfqueryparam cfsqltype="cf_sql_varchar" value="#columnname2#">,
<cfif isdefined("file.serverFile")>'#file.serverFile#'<cfelse>NULL</cfif>,
</cfquery>
How does this process work in .NET? as I have to create a simple web application/form where on submission of the form the data would be stored in a MYSQL database.
what I have seen so far it seems a far more long winded and complicated process with .NET over Coldfusion with ultimately the same result, and I am desperately trying to understand how it works in .NET as surely it must be a similar process to that of Coldfusion?
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Jun 12, 2010
I'm trying to learn how to do both of them at the same time on my own, while working on a project. All the examples in the MSDN are using databases that are a local SQL Server (Express) file. I am not going to be able to just upload the project (including the file) and have it work, am I? The thing is - I want to be able to write code vs. a database that is actually going to work online so I can start putting a project together and know that it is going to work online.
I don't want to get everything done, and then discover it breaks as soon as I upload everything. Assuming I can't just upload the database file and have it work - I have a hosting account that I am using for something else and I would like to set up a database to use (preferably MySQL because my SQL Server database quota is used up and I'd have to pay extra for another, but I will if I have to because it's not that much). I can do that, correct?
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Feb 26, 2010
I have never used reporting services before. My boss just started teaching me how to use them. I was told something by my boss that I find hard to believe. In our environment we have 3 databases: Development Beta Production According to my boss, the connection string has to be hard coded in the reports. Therefore every time you move a report from one environment to another you have to manually change the connection string so that it points to the correct database.
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Feb 20, 2011
I've installed the Components from the links below. But I still can't find any SQL references when I try to add them? I'm wondering if anyone would know the reason for this? I just started with asp.net. I've found several other questions regarding code for connecting but I can't find anyone who've had trouble with the Connector/components before?
MYSQL connector
[URL]
Microsoft Data Access Components (MDAC) 2.8
[URL]
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Jul 25, 2010
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I'm trying to write a method in VB.net so that when I click a button it queries the database and returns all the values which match a textbox which is located next to the button. I have no idea how to do this, I assume in the onclick method for the button I will need to pull in the value from the textbox, connect to the database and display the results to a gridview?
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While working with LINQ to ENTITIES I see that there is only a way to use stored procedure that is returning one entity only, or a view that is a join of two entities.
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I have one Stored Procedure that return the two tables, but entities don't support this right now.
I can split them to two Stored Procedure and call each of them separately.
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[URL]
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Mar 7, 2011
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Mar 7, 2011
I have a application with a 3-tier architecture. Onclick event of a button, I am calling a method in my code behind file. This method is defined in the Interface( Interface resides in my Business layer) and the implemtation of this method is given in the Data access layer.
The business layer and DAL are on different projects. I have compiled the entire solution and it complies OK. Now when I try to click the button I get the error:
"The method 'doInsertCust' was not found on the interface/type 'My.Type, MyTypeLibrary, Version=1.0.2371.15203, Culture=neutral, PublicKeyToken=null'.".
Note that I have already build the Business layer and DAL and the respective DLL gets automatically refreshed.
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I m trying to connect to my Active Directory and fetch the attribute of my AD.Whenever i trying to execute the console application made in c# i get following error.[CODE]The type or namespace name 'DirectoryServices' does not exist in the namespace 'System' (are you missing an assembly reference?)[/CODE]
[code]...
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When ever I try to connect to server through Microsoft sql server management studio express then an error is generated saying that
Cannot connect to .//SQLEXPRESS
Additional Information
A network related or instance specfic error occured while connecting to SQL server. The server not found or not accessible verify that instance name is correct and that SQL server is configured to allow remote connections.(Provider: Named Pipes Provider, error 40-could not open connection to SQL server )(Microsoft SQL server, Error:53)
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Feb 23, 2011
i'm using visual studio 2005. now i've to create a insert form which shud be connected to database(mssql). can any one tell me how to do dat. as i'm new to visual studio i dnt knw it.
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Mar 8, 2010
Could not establish a connection to the database. If you have not yet created the SQL Server database, exit the Web Site Administration tool, use the aspnet_regsql command-line utility to create and configure the database, and then return to this tool to set the provider. I have set up a db locally which mimics the production DB, THe production db and website has no has no issues.
THis used to work till i had hard disk failure and had to reinstall all software and do the db from scratch. Used the table scripts and ran the aspnet_regsql. I am using sql server express 2008 asp.net 3.5 I am using custom provider for Roles and custom membership provider for Memberships. Pretty sure the problem is in the db permissions, though I have set up Users in the Security of the DB.
[Code]....
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Oct 1, 2010
I have all my tables and queries in online DB ie., i have created all my tables and queries in online using third party site [URL] Now i want to make connect my application (which is in my system) with that database
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Feb 25, 2010
Is there a way to connect the database PROGRAMMATICALLY without using SYSTEM.DATA.SQLCLIENT?
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Aug 5, 2010
I had another thread on this problem but I wanted to start this one so no one had to look at the code I posted in the other thread. I have a successful connection but want to display data from the SQL database on my website in my Windows form application. Here's the code I have so far. Used some of the ADONET Tutorial1 here. The table Ray Rover Activation has a number of different columns but to start out I just wanted to see if I could display data for the EmailAddress column.
Code:
[code]....
If I comment out the Sub DoStuff I don't get any errors but neither is anything displayed other than the messagebox message. If I don't comment out DoStuff then I get an error, "Incorrect syntax near the keyword 'FROM'". Maybe someone could enlighten me some on what I need to do get the data in the column EmailAddress to display.
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Jul 28, 2010
I have a custom SQL membership provider (NOT using aspdb files but our own 'People' table) that was working fine under development but doesn't even connect when it is deployed on web server. DB connection string has been changed to point to db server (checked against another web site & is fine there). The membership code (in VB) is in App_code directory so am I correct in thinking I don't need a separate DLL ? No error messages nothing just reports failed to login when I type some user credentials.
Web config file as follows
[Code]....
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