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error 40 could not open a connection to sql server when passingselected values

P: n/a

Once again I have hit a brick wall here. I have a combobox in which
the user types the server name and then clicks on button 'CONNECT' to
populate the next combobox which contains all the databases in that
server. Then after the user selects a database, I have another button
that he/she click and I want to retrieve file groups from a specific
table. At this point when he/she clicks on that button I get an error:
"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)"

The error happens at the open line (button8_click):
With cn
.ConnectionString = "Data Source=" &
comboServers.SelectedValue & ";Initial Catalog=" &
comboDatabases.SelectedValue & ";Integrated Security=SSPI"
End With
Why am I getting this error? I also noticed that when i put the mouse
over the .connectionstring, the datasource and the initial catalog are
empty, which they shouldn't be, because I am passing the first
combobox selectedvalue and the second combobox selectedvalue.

How can I passed the values that the user typed in the first box and
selected on the second one? That'll probably solve the problem. I
tried selecteditem but did not work either and gave me the same error
Thank you very much in advanced!

Here is all my code from the beginning up to that button that is not
working as it should.
Imports System
Imports System.IO
Imports System.Collections
Imports System.Data
Imports System.Data.OleDb
Imports System.Data.SqlClient
Imports System.Configuration
Imports System.Windows.Forms
Imports Microsoft.SqlServer
Imports Microsoft.SqlServer.Server
Imports Microsoft.SqlServer.Management
Imports Microsoft.SqlServer.Management.Smo
Imports Microsoft.SqlServer.Management.Common
Imports Excel = Microsoft.Office.Interop.Excel
Imports System.Text
Imports System.Runtime.InteropServices
Public Class Form1
Private Declare Function ShellEx Lib "shell32.dll" Alias
"ShellExecuteA" ( _
ByVal hWnd As Integer, ByVal lpOperation As String, _
ByVal lpFile As String, ByVal lpParameters As String, _
ByVal lpDirectory As String, ByVal nShowCmd As Integer) As
'Public Class frmSQLConnection
Private m_objServer As Server
Public Property SMOServer() As Server
Return m_objServer
End Get
Private Set(ByVal value As Server)
m_objServer = value
End Set
End Property

Private m_objDatabase As Database
Public Property SMODatabase() As Database
Return m_objDatabase
End Get
Private Set(ByVal value As Database)
m_objDatabase = value
End Set
End Property

Private Sub Mainform_Load(ByVal sender As System.Object, ByVal e
As System.EventArgs) Handles MyBase.Load

Dim objServers As DataTable
Dim strServer As String

'---- retrieve a list of SQL Server instances on the network
objServers = SmoApplication.EnumAvailableSqlServers(False)

For Each objRow As DataRow In objServers.Rows

strServer = CStr(objRow("Server"))
If Not TypeOf objRow("Instance") Is DBNull AndAlso
CStr(objRow("Instance")).Length 0 Then

strServer += "\" & CStr(objRow("Instance"))

End If



Me.comboDatabases.Enabled = False

End Sub
Private Sub button2_Click(ByVal sender As System.Object, ByVal e
As System.EventArgs) Handles Button2.Click
'Private Sub comboservers_SelectedIndexChanged(ByVal sender As
System.Object, ByVal e As System.EventArgs) Handles

Dim objConn As ServerConnection

'If Me.comboServers.Text.Trim.Length() = 0 Then
objConn = New ServerConnection()

If Me.comboServers.Text.Trim.Length() 0 Then

objConn.ServerInstance = Me.comboServers.Text.Trim()

End If
Me.SMOServer = New Server(objConn)

'End If
'---- Note: the connection will open when we call our first
method on the Server object
For Each objDB As Database In Me.SMOServer.Databases

Me.comboDatabases.Enabled = True

Me.comboDatabases.SelectedIndex = -1
End Sub
'Private Sub comboDatabases_Click(ByVal sender As System.Object,
ByVal e As System.EventArgs)
Private Sub button8_Click(ByVal sender As System.Object, ByVal e
As System.EventArgs) Handles Button8.Click


Dim cn As New SqlClient.SqlConnection()
Dim cm As New SqlClient.SqlCommand()
Dim dr As SqlClient.SqlDataReader

With cn
.ConnectionString = "Data Source=" &
comboServers.SelectedValue & ";Initial Catalog=" &
comboDatabases.SelectedValue & ";Integrated Security=SSPI"
End With
With cm
.CommandText = "usp_DR_Spam_BB_Search_filesets"
.CommandType = CommandType.StoredProcedure
.Connection = cn
End With

dr = cm.ExecuteReader(CommandBehavior.CloseConnection)
While dr.Read
End While
End Sub

Jun 27 '08 #1
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2 Replies

P: n/a
I have already checked the error message on google. Thank you very

My question is how to pass the typed server from the first combobox
and the second selected database from the combobox to the

If I use a different method of connecting to the server and database
and then pass the connectionstring it works fine....!

Jun 27 '08 #3

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