I am trying to connect to a database with an asp.net page I am using a sql datasource control that has been supplied with visual studio. The Connection string is being stored in the web config file. The error that I am getting is after I have deployed the project and during runtime.
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:
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
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.Sql Client.SqlInter nalConnection.O nError(SqlExcep tion exception, Boolean breakConnection ) +734963
System.Data.Sql Client.TdsParse r.ThrowExceptio nAndWarning(Tds ParserStateObje ct stateObj) +188
System.Data.Sql Client.TdsParse r.Connect(Boole an& useFailoverPart ner, Boolean& failoverDemandD one, String host, String failoverPartner , String protocol, SqlInternalConn ectionTds connHandler, Int64 timerExpire, Boolean encrypt, Boolean trustServerCert , Boolean integratedSecur ity, SqlConnection owningObject, Boolean aliasLookup) +820
System.Data.Sql Client.SqlInter nalConnectionTd s.OpenLoginEnli st(SqlConnectio n owningObject, SqlConnectionSt ring connectionOptio ns, String newPassword, Boolean redirectedUserI nstance) +628
System.Data.Sql Client.SqlInter nalConnectionTd s..ctor(DbConne ctionPoolIdenti ty identity, SqlConnectionSt ring connectionOptio ns, Object providerInfo, String newPassword, SqlConnection owningObject, Boolean redirectedUserI nstance) +170
System.Data.Sql Client.SqlConne ctionFactory.Cr eateConnection( DbConnectionOpt ions options, Object poolGroupProvid erInfo, DbConnectionPoo l pool, DbConnection owningConnectio n) +359
System.Data.Pro viderBase.DbCon nectionFactory. CreateNonPooled Connection(DbCo nnection owningConnectio n, DbConnectionPoo lGroup poolGroup) +27
System.Data.Pro viderBase.DbCon nectionFactory. GetConnection(D bConnection owningConnectio n) +47
System.Data.Pro viderBase.DbCon nectionClosed.O penConnection(D bConnection outerConnection , DbConnectionFac tory connectionFacto ry) +105
System.Data.Sql Client.SqlConne ction.Open() +111
System.Data.Com mon.DbDataAdapt er.FillInternal (DataSet dataset, DataTable[] datatables, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior) +121
System.Data.Com mon.DbDataAdapt er.Fill(DataSet dataSet, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior) +137
System.Data.Com mon.DbDataAdapt er.Fill(DataSet dataSet, String srcTable) +83
System.Web.UI.W ebControls.SqlD ataSourceView.E xecuteSelect(Da taSourceSelectA rguments arguments) +1770
System.Web.UI.D ataSourceView.S elect(DataSourc eSelectArgument s arguments, DataSourceViewS electCallback callback) +17
DevExpress.Web. ASPxClasses.Int ernal.DataHelpe r.PerformSelect () +190
DevExpress.Web. ASPxClasses.Int ernal.DataConta iner.PerformSel ect() +118
DevExpress.Web. ASPxClasses.ASP xDataWebControl Base.DataBindCo re() +15
DevExpress.Web. ASPxClasses.ASP xDataWebControl Base.DataBind() +108
DevExpress.Web. ASPxClasses.Int ernal.DataHelpe rBase.EnsureDat aBound(Boolean ensureChildCont rols) +89
DevExpress.Web. ASPxClasses.Int ernal.DataConta iner.EnsureData Bound() +128
DevExpress.Web. ASPxDataView.AS PxDataViewBase. CreateChildCont rols() +15
System.Web.UI.C ontrol.EnsureCh ildControls() +87
DevExpress.Web. ASPxClasses.ASP xWebControlBase .EnsureChildCon trols() +4
System.Web.UI.C ontrol.PreRende rRecursiveInter nal() +41
System.Web.UI.C ontrol.PreRende rRecursiveInter nal() +161
System.Web.UI.C ontrol.PreRende rRecursiveInter nal() +161
System.Web.UI.P age.ProcessRequ estMain(Boolean includeStagesBe foreAsyncPoint, Boolean includeStagesAf terAsyncPoint) +1360
1  935 
You have to enable the remote connections in SQL Server 2005.
GO TO SqlServer Surface Area Configuration
Select, SqlServer Surface Area Configuration for services and connections
In The Remote Connections, Select Local and remote.
Now try to access ur SQL Server from another client PC's Management Studio.
Thats it.
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