Hi,
I use an oracle database and I want to use it with SqlDataSource and also ObjectDatasource. When I use the connexion with the SqlDataSource and a listbox than display all results It works,
When i want to write a Business Layer using that connexion, it fails... Hope one of you would find the problem... Thks 
 
Here's the connexion declaration in web.config : 
<connectionStrings>
    <add name="GMTDB" connectionString="Data Source=opargiad02;User Id=-----;Password=-----;Integrated Security=no;" providerName="System.Data.OracleClient"/>
    </connectionStrings> 
 SqlDataSource : (This works)
<asp:SqlDataSource ID="SqlDataSource2" runat="server" ConnectionString="<%$ ConnectionStrings:GMTDB %>"
ProviderName="<%$ ConnectionStrings:GMTDB.ProviderName %>" SelectCommand='SELECT LLOGIN FROM TUSEGIA'>
 </asp:SqlDataSource>
 <asp:ListBox ID="UserList2" CausesValidation="false"
AutoPostBack="true" OnSelectedIndexChanged="userSelection" Rows="10"
runat="server" DataTextField="LLOGIN" DataSourceID="SqlDataSource2">
</asp:ListBox> 
(=> I have to specify ProviderName, if i don't, i gad same error than below)
 
WHen i want to use this connexion in a business layer
            string connectionString = ConfigurationManager.ConnectionStrings["GMTDB"].ConnectionString;
            System.Data.IDbConnection dbConnection = new System.Data.SqlClient.SqlConnection(connectionString);
            string queryString;
            queryString = "SELECT LLOGIN,LNAME,LFIRSTNAME,LDATCREAT,LCOMMENT,LPASS,LSUPADMIN,LACTIVE, LWORKADMIN FROM [TUSEGIA]";
            System.Data.IDbCommand dbCommand = new System.Data.SqlClient.SqlCommand();
            dbCommand.CommandText = queryString;
            dbCommand.Connection = dbConnection;
            System.Data.IDbDataAdapter dataAdapter = new System.Data.SqlClient.SqlDataAdapter();
            dataAdapter.SelectCommand = dbCommand;
            System.Data.DataSet dataSet = new System.Data.DataSet();
            dataAdapter.Fill(dataSet);
            return dataSet; 
I gad this error : (that is very explicit) THis is amazing how we have no details about what the execption thrown...
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) 
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: 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 Error: 





Line 61: 
Line 62:             System.Data.DataSet dataSet = new System.Data.DataSet();
Line 63:             dataAdapter.Fill(dataSet);
Line 64:             return dataSet;
Line 65:         }

Source File: 
c:\GMT\GIANT_WEB5\App_Code\UserDB.cs    Line: 63 

Stack 
Trace: 





[SqlException (0x80131904): 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)]
   System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection) +735107
   System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj) +188
   System.Data.SqlClient.TdsParser.Connect(Boolean& useFailoverPartner, Boolean& failoverDemandDone, String host, String failoverPartner, String protocol, SqlInternalConnectionTds connHandler, Int64 timerExpire, Boolean encrypt, Boolean trustServerCert, Boolean integratedSecurity, SqlConnection owningObject, Boolean aliasLookup) +820
   System.Data.SqlClient.SqlInternalConnectionTds.OpenLoginEnlist(SqlConnection owningObject, SqlConnectionString connectionOptions, String newPassword, Boolean redirectedUserInstance) +628
   System.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdentity identity, SqlConnectionString connectionOptions, Object providerInfo, String newPassword, SqlConnection owningObject, Boolean redirectedUserInstance) +170
   System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions options, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningConnection) +359
   System.Data.ProviderBase.DbConnectionFactory.CreatePooledConnection(DbConnection owningConnection, DbConnectionPool pool, DbConnectionOptions options) +28
   System.Data.ProviderBase.DbConnectionPool.CreateObject(DbConnection owningObject) +424
   System.Data.ProviderBase.DbConnectionPool.UserCreateRequest(DbConnection owningObject) +66
   System.Data.ProviderBase.DbConnectionPool.GetConnection(DbConnection owningObject) +496
   System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection) +82
   System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory) +105
   System.Data.SqlClient.SqlConnection.Open() +111
   System.Data.Common.DbDataAdapter.FillInternal(DataSet dataset, DataTable[] datatables, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior) +121
   System.Data.Common.DbDataAdapter.Fill(DataSet dataSet, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior) +137
   System.Data.Common.DbDataAdapter.Fill(DataSet dataSet) +86
   gmtDL.UserDB.GetUsers() in c:\GMT\GIANT_WEB5\App_Code\UserDB.cs:63
   gmtDL.UserComponent.getUser(String sortExpression) in c:\GMT\GIANT_WEB5\App_Code\UserComponent.cs:33

[TargetInvocationException: Exception has been thrown by the target of an invocation.]
   System.RuntimeMethodHandle._InvokeMethodFast(Object target, Object[] arguments, SignatureStruct& sig, MethodAttributes methodAttributes, RuntimeTypeHandle typeOwner) +0
   System.RuntimeMethodHandle.InvokeMethodFast(Object target, Object[] arguments, Signature sig, MethodAttributes methodAttributes, RuntimeTypeHandle typeOwner) +72
   System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, Boolean skipVisibilityChecks) +358
   System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture) +29
   System.Web.UI.WebControls.ObjectDataSourceView.InvokeMethod(ObjectDataSourceMethod method, Boolean disposeInstance, Object& instance) +482
   System.Web.UI.WebControls.ObjectDataSourceView.ExecuteSelect(DataSourceSelectArguments arguments) +2040
   System.Web.UI.DataSourceView.Select(DataSourceSelectArguments arguments, DataSourceViewSelectCallback callback) +17
   System.Web.UI.WebControls.DataBoundControl.PerformSelect() +149
   System.Web.UI.WebControls.BaseDataBoundControl.DataBind() +70
   System.Web.UI.WebControls.GridView.DataBind() +4
   System.Web.UI.WebControls.BaseDataBoundControl.EnsureDataBound() +82
   System.Web.UI.WebControls.CompositeDataBoundControl.CreateChildControls() +69
   System.Web.UI.Control.EnsureChildControls() +87
   System.Web.UI.Control.PreRenderRecursiveInternal() +41
   System.Web.UI.Control.PreRenderRecursiveInternal() +161
   System.Web.UI.Control.PreRenderRecursiveInternal() +161
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1360

 
 

                                        
                                         
 

This problem is solved... I thaught  System.Data.SqlClient was a generic class for all sql databases. This is a such a bad name for a  sqlserver specific class...