The Type Or Namespace Name 'SqlServer' Does Not Exist In The Namespace 'System.Data'


I have created a .net class library and i include the namespace :

using System.Data.SqlServer

but when i build my .net class library i get the folowing error:

The type or namespace name 'SqlServer' does not exist in the namespace 'System.Data' (are you missing an assembly reference?) 


your help is highly appreciated

Best regards

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Error: 'Dts' Does Not Exist In The Namespace 'Microsoft.Sqlserver'

I tried to create a package from a C# program, and I copied this from SQL server online book:

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I have a problem with adding a namespace declaration to my XML query. As soon as I add the namespace declaration to the final XQuery most of my nodes disappear from the document. I've got a simplified version of it here so people can run it.

If I remove the declare clause (in red) it works and you see all the nodes but then I don't have the namespace. So it seems to be that the subquery (in {}) isn't recognising the namespace declaration?

declare @Tmp table (nodeValue int)
insert into @Tmp (nodeValue) values (1)
insert into @Tmp (nodeValue) values (2)
insert into @Tmp (nodeValue) values (3)

declare @x xml
set @x = (
from @Tmp
for xml path('node'), root('root'), type

select @x.query('declare default element namespace "";
for $node in /root/node
<proj class="something" key="{ data($node/nodeValue) }" />

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The Type Or Namespace Name 'SqlDataReader' Could Not Be Found

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I created a clr proc that gets the most recent file within a directory based on the creation time property, see code below.  I have attempted to replicate this within a clr scalar valued function in order to assign the resulting value to a variable within SQL server.  I am getting the error message:

Msg 6522, Level 16, State 2, Line 1

A .NET Framework error occurred during execution of user-defined routine or aggregate "clr_fn_recentfile":

System.InvalidOperationException: Data access is not allowed in this context. Either the context is a function or method not marked with DataAccessKind.Read or SystemDataAccessKind.Read, is a callback to obtain data from FillRow method of a Table Valued Function, or is a UDT validation method.


at System.Data.SqlServer.Internal.ClrLevelContext.CheckSqlAccessReturnCode(SqlAccessApiReturnCode eRc)

at System.Data.SqlServer.Internal.ClrLevelContext.GetCurrentContext(SmiEventSink sink, Boolean throwIfNotASqlClrThread, Boolean fAllowImpersonation)

at Microsoft.SqlServer.Server.InProcLink.GetCurrentContext(SmiEventSink eventSink)

at Microsoft.SqlServer.Server.SmiContextFactory.GetCurrentContext()

at Microsoft.SqlServer.Server.SqlContext.get_CurrentContext()

at Microsoft.SqlServer.Server.SqlContext.get_Pipe()

at clr_fn_recentfile.clr_fn_recentfile.clr_fn_recentfile(SqlString Filepath)

After trying to troubleshoot this I am aware that this error is rather generic and have not been able to find any specific documenation regardint the use of file system objects with clr functions.  I am at a loss.  Any help would be appreciated!

Code Snippet
Imports System
Imports System.Data
Imports System.Data.SqlClient
Imports System.Data.SqlTypes
Imports Microsoft.SqlServer.Server
Imports System.IO
Partial Public Class clr_recentfile
Public Shared Sub clr_recentfile(ByVal Filepath As SqlString)
Dim strFile As String
Dim sp As SqlPipe = SqlContext.Pipe()
Dim maxDate As Date
Dim fil As String
Dim qry As New SqlCommand()
If Directory.Exists(Filepath.ToString) Then
For Each strFile In Directory.GetFiles(Filepath.ToString)
fil = Path.GetFileName(strFile).ToString
Dim fi As New FileInfo(strFile)
If maxDate = Nothing Then
maxDate = fi.CreationTime
fil = fi.FullName.ToString
If maxDate < fi.CreationTime Then
maxDate = fi.CreationTime
End If
End If
sp.Send("Directory does not exist")
End If
If fil <> Nothing Then
qry.CommandText = " SELECT '" & fil & "'"
'Execute the query and pass the result set back to SQL
End If
Catch ex As Exception
End Try
End Sub
End Class


Code Snippet
Imports System
Imports System.Data
Imports System.Data.SqlClient
Imports System.Data.SqlTypes
Imports Microsoft.SqlServer.Server
Imports System.IO
Partial Public Class clr_fn_recentfile
<Microsoft.SqlServer.Server.SqlFunction()> _
Public Shared Function clr_fn_recentfile(ByVal Filepath As SqlString) As SqlString
Dim strFile As String
Dim sp As SqlPipe = SqlContext.Pipe()
Dim maxDate As Date
Dim fil As String
Dim qry As New SqlCommand()
If Directory.Exists(Filepath.ToString) Then
For Each strFile In Directory.GetFiles(Filepath.ToString)
fil = Path.GetFileName(strFile).ToString
Dim fi As New FileInfo(strFile)
If maxDate = Nothing Then
maxDate = fi.CreationTime
fil = fi.FullName.ToString
If maxDate < fi.CreationTime Then
maxDate = fi.CreationTime
End If
End If
sp.Send("Directory does not exist")
Exit Function
End If
If fil <> Nothing Then
Return fil
End If
Catch ex As Exception
End Try
End Function
End Class

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Source Error:

Line 34: }Line 35: Line 36: public DataReader getPersonList2(){Line 37: return d.getPersonList2();Line 38: }

Source File: c:InetpubwwwrootstudyApp_CodeBLL.cs
   Line: 36
Just wondering if someone could tell me why this is happening? I have the same namespaces that I have in the DAL in my BLL.Puzzled.

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The only differences I can see between the message that does not work and those that do are that the one that doesn't is large and it is XML data that I read from a .xml file produced by MS Word as opposed to internally generated strings in the other working messages.

Does anybody have any suggestions as to why the body of the message is not being sent in this case?
Is there something about the example code that precludes sending this type of message?

This is the code that sends the message (extracted from Conversation.cs in ServiceBrokerExample)

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            param = cmd.Parameters.Add("@ch", SqlDbType.UniqueIdentifier);
            param.Value = m_handle;
            param = cmd.Parameters.Add("@mt", SqlDbType.NVarChar, 255);
            param.Value = message.Type;

            if (message.Body != null)
                query += " (@msg)";
                param = cmd.Parameters.Add("@msg", SqlDbType.VarBinary);
                param.Value = new SqlBytes(message.Body);
                param.Size = -1;
            cmd.CommandText = query;

This is the code that reads the message from the SQL queue (extracted from Message.cs in ServiceBrokerExample)

            m_reader = reader;
            m_convGroupId = reader.GetGuid(0);
            m_conv = new Conversation(service, reader.GetGuid(1));
            m_sequenceNumber = reader.GetInt64(2);
            m_serviceName = reader.GetString(3);
            m_contractName = reader.GetString(4);
            m_type = reader.GetString(5);
            m_validation = reader.GetString(6);
            if (!reader.IsDBNull(7))
                SqlBytes sb = reader.GetSqlBytes(7);
                Body = sb.Stream;
                Body = null;

This is the MESSAGE TYPE used by this message.


Here is the code where msgReceived.Body == null in the SQL CLR method invoked by this message.

    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1062:ValidateArgumentsOfPublicMethods"), System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Performance", "CA1822:MarkMembersAsStatic"), BrokerMethod("AssessmentContract", "CreateReport_Command")]
    public void CreateReport_Command(
        Message msgReceived,
        SqlConnection connection,
        SqlTransaction transaction)
        StreamReader reader = null;

            reader = new StreamReader(msgReceived.Body);

And finally here is the code snippet that creates the stream that gets loaded into the message to be sent.

            if (Report != null && ReportName != null)
                MemoryStream ReportBody = new MemoryStream();

                if (ReportID == null)
                    ReportID = Guid.NewGuid().ToString();

                ReportBody.Write(Encoding.ASCII.GetBytes(ReportID), 0, ReportID.Length);
                ReportBody.Write(Encoding.ASCII.GetBytes("|".ToCharArray()), 0, 1);
                ReportBody.Write(Encoding.ASCII.GetBytes(ReportName), 0, ReportName.Length);
                ReportBody.Write(Encoding.ASCII.GetBytes("|".ToCharArray()), 0, 1);
                ReportBody.Write(Encoding.ASCII.GetBytes(Report), 0, Report.Length);

                Microsoft.Samples.SqlServer.Message request = new Microsoft.Samples.SqlServer.Message("CreateAssessmentReport_Command", ReportBody);

                // Send the message to the service
                dialog.Send(request, conn, tran);

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Line 23: //SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["cellulant_ConnectionString"].ToString());
Line 24: SqlConnection con = new SqlConnection(ConfigurationManager.AppSettings["cellulant_ConnectionString"].ToString());
Line 25:
Line 26: Source File: c:inetpubwwwrootcellulant1App_Codesignup_data-entry.cs    Line: 24   using System;
using System.Data;
using System.Configuration;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;

public class signup_data_entry
public signup_data_entry(DateTime dob1)

//SqlConnection con = new SqlConnection("cellulant_ConnectionString");
//SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["cellulant_ConnectionString"].ToString());
SqlConnection con = new SqlConnection(ConfigurationManager.AppSettings["cellulant_ConnectionString"].ToString());

SqlCommand command = new SqlCommand("Cellulant_Users_registration", con);
command.CommandType = CommandType.StoredProcedure;


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Dim opkg As New DTS.Package
Dim sServer As String
Dim sPackageName As String, sMessage As String
Dim sUser As String
Dim lErr As Long, sSource As String, sDesc As String
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oPKG.LoadFromSQLServer(sServer, ,
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End Sub

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Line 57:
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Dear all,
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At first I have just a Flat File Source and then Script Component, nothing else.

[Script Component [516]] Error: System.InvalidCastException: Unable to cast COM object of type 'System.__ComObject' to class type 'System.Data.SqlClient.SqlConnection'. Instances of types that represent COM components cannot be cast to types that do not represent COM components; however they can be cast to interfaces as long as the underlying COM component supports QueryInterface calls for the IID of the interface.    at Microsoft.SqlServer.Dts.Pipeline.ScriptComponentHost.HandleUserException(Exception e)    at Microsoft.SqlServer.Dts.Pipeline.ScriptComponentHost.AcquireConnections(Object transaction)    at Microsoft.SqlServer.Dts.Pipeline.ManagedComponentHost.HostAcquireConnections(IDTSManagedComponentWrapper90 wrapper, Object transaction)
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' This is your new script component in Microsoft Visual Basic .NET
' ScriptMain is the entrypoint class for script components
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Imports System.Data.SqlClient
Imports System.Math
Imports Microsoft.SqlServer.Dts.Pipeline.Wrapper
Imports Microsoft.SqlServer.Dts.Runtime.Wrapper
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    Inherits UserComponent
    Dim nDTS As IDTSConnectionManager90
    Dim sqlConnecta As SqlConnection
    Dim sqlComm As SqlCommand
    Dim sqlParam As SqlParameter
    Public Overrides Sub Input0_ProcessInputRow(ByVal Row As Input0Buffer)
        Dim valorColumna As String
        Dim valorColumna10 As Double
        valorColumna = Row.Column9.Substring(1, 1)
        If valorColumna = "N" Then
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            valorColumna10 = CDbl(Row.Column10 / 100)
        End If
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        Me.Output0Buffer.NIFREP = CStr(Row.Column4)
        Me.Output0Buffer.NOMBRE = CStr(Row.Column6)
        Me.Output0Buffer.EJERDEV = CDbl(Row.Column13)
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            .Parameters("@Nombre").Value = CStr(Row.Column6)
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            .Parameters("@Modalidad").Value = CInt(Row.Column8)
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            .Parameters("@ImpReten").Value = CDbl(Row.Column12 / 100)
            .Parameters("@EjerDev").Value = CDbl(Row.Column13)
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    End Sub
    Public Overrides Sub AcquireConnections(ByVal Transaction As Object)
        Dim nDTS As IDTSConnectionManager90 = Me.Connections.TablaMODELO80
        sqlConnecta = CType(nDTS.AcquireConnection(Nothing), SqlConnection)
    End Sub
    Public Overrides Sub PreExecute()
        sqlComm = New SqlCommand("INSERT INTO hac_modelo180(Ejercicio,NIFPerc,NIFReP,Nombre,CodProv,Modalidad,ImpBase,PorcReten,ImpReten,EjerDev) " & _
    "VALUES(@Ejercicio,@NIFPerc,@NIFReP,@Nombre,@CodProv,@Modalidad,@ImpBase,@PorcReten,@ImpReten,@EjerDev)", sqlConnecta)
        sqlParam = New SqlParameter("@Ejercicio", Data.SqlDbType.SmallInt)
        sqlParam = New SqlParameter("@NIFPerc", Data.SqlDbType.Char)
        sqlParam = New SqlParameter("@NIFReP", Data.SqlDbType.Char)
        sqlParam = New SqlParameter("@Nombre", Data.SqlDbType.VarChar)
        sqlParam = New SqlParameter("@CodProv", Data.SqlDbType.TinyInt)
        sqlParam = New SqlParameter("@Modalidad", Data.SqlDbType.SmallInt)
        sqlParam = New SqlParameter("@ImpBase", Data.SqlDbType.Decimal)
        sqlParam = New SqlParameter("@PorcReten", Data.SqlDbType.Decimal)
        sqlParam = New SqlParameter("@ImpReten", Data.SqlDbType.Decimal)
        sqlParam = New SqlParameter("@EjerDev", Data.SqlDbType.Decimal)
    End Sub
    Public Sub New()
    End Sub
    Public Overrides Sub ReleaseConnections()
    End Sub
    Protected Overrides Sub Finalize()
    End Sub
End Class
Thanks a lot for your help  

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I get the following message in the vs2005 querybuilder when i do a preview:


SQL Execution Error.

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Error Source: SQL Server Compact Edition ADO.NET Data Provider

Error Message: @PARAM1 : Unable to cast object of type 'System.Data.SqlTypes.SqlInt32 to type System.IConvertable'.

The same querypreview works fine without the parameter:


SELECT Schoolindex, Variant, VVSchool, [index], indincl, VVRuimtes, School FROM School WHERE (Schoolindex = 186)


Can anybody tell me why this is?
And tell me a way to get the tableadapter working?


Anne-Jan Tuinstra

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I have created a windows library control that accesses a local sql database

I tried the following strings for connecting

Dim connectionString As String = "Data Source=localhostSQLEXPRESS;Initial Catalog=TimeSheet;Trusted_Connection = true"

Dim connectionString As String = "Data Source=localhostSQLEXPRESS;Initial Catalog=TimeSheet;Integrated Security=SSPI"


I am not running the webpage in a virtual directory but in


and I have a simple index.html that tries to read from an sql db but throws

the error

System.Security.SecurityException: Request for the permission of type 'System.Data.SqlClient.SqlClientPermission, System.Data, Version=, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed.
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   at System.Data.Common.DbConnectionOptions.DemandPermission()
   at System.Data.SqlClient.SqlConnection.PermissionDemand()
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etc etc

 The action that failed was:
The type of the first permission that failed was:
The Zone of the assembly that failed was:

I looked into the .net config utility but it says unrestricted and I tried adding it to the trusted internet zones in ie options security

I think that a windows form connecting to a sql database running in a webpage should be simple

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Request For The Permission Of Type 'System.Data.SqlClient.SqlClientPermission, System.Data, Version=, Culture=neutral, Pu

I created a .net console application within which I connect to a sql server (not local) as follows,

string conn_str = "Integrated Security=SSPI;Persist Security Info=False;Initial Catalog=QuantEquitySql;Data Source=server name";

SqlConnection conn = new SqlConnection(conn_str);

Everything works fine when I run it from my computer. When I try to run it from a network share I get the following error,
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A First Chance Exception Of Type 'System.Data.SqlClient.SqlException' Occurred In

I've written this code multiple times now. But for the first time i get an error at the line underlined. My procedure runs perfectly when i execute it through Sql Query analyzer.
plzz help.. Its urgent and am unable to find the reason for this error "A first chance exception of type 'System.Data.SqlClient.SqlException' occurred in"
Thanks !SqlConnection conn = new SqlConnection(DbConnectionString);
SqlCommand cmd = conn.CreateCommand();
cmd.CommandText = "dbo.rqryTradesPRR";
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SqlDataReader reader = cmd.ExecuteReader();
// have written something here

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hi  i dont know how to do type casting.

this.Variables.ObjVariable this objVariables i have create in variable place below like this


Name:Variable datatype int32 values 0

Name: NumberofRowsdatatype int32  values 10000

Name: ObjVariable  datatype Object


My code



public override void CreateNewOutputRows()



Add rows by calling the AddRow method on the member variable named "<Output Name>Buffer".

For example, call MyOutputBuffer.AddRow() if your output was named "MyOutput".


System.Data.OleDb.OleDbDataAdapter oLead = new System.Data.OleDb.OleDbDataAdapter();

//System.Data.Odbc.OdbcDataAdapter oLead = new System.Data.Odbc.OdbcDataAdapter();

//SqlDataAdapter oLead = new SqlDataAdapter();

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DataSet ds = (DataSet)this.Variables.ObjVariable;  // here i am getting error


ADODB.Record rs = new ADODB.Record();


oLead.Fill(ds, rs, "Variables");

foreach (DataRow row in dt.Rows)




Output0Buffer.Column = (int)row["Column"];

Output0Buffer.Column1 = row["Column1"].ToString();

Output0Buffer.Column2 = row["Column2"].ToString();





This is the error

Unable to cast object of type 'System.Object' to type 'System.Data.DataSet'.

at ScriptMain.CreateNewOutputRows()

at UserComponent.PrimeOutput(Int32 Outputs, Int32[] OutputIDs, PipelineBuffer[] Buffers)

at Microsoft.SqlServer.Dts.Pipeline.ScriptComponentHost.PrimeOutput(Int32 outputs, Int32[] outputIDs, PipelineBuffer[] buffers)




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