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ASP.NET VB running query against several servers times out.

Posted on 2011-03-02
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Last Modified: 2012-05-11
I have an asp.net vb app that will let you enter any query and run it against a single sql 2000 server or as many as 100 servers.  The results are displayed in a gridview.  This works great, unless it times out.  I have increased the connection timeout but still seem to have the same problem.  Thanks in advance for the help
VB Code ********
If RadioButton1.Checked = True Then 'All servers
                    myConnection = New SqlConnection("server=10.20.14.31;uid=user;pwd=pass;database=SCADA_DATA")
                    'establishing connection. you need to provide password for sql server
                    Try
                        myConnection.Open()
                        'opening the connection
                        myCommand = New SqlCommand("Select * from serverlist", myConnection)
                        'executing the command and assigning it to connection 
                        dr = myCommand.ExecuteReader()
                        While dr.Read()
                            'reading from the datareader
                            Dim VobServer As String = dr(1).ToString()
                            'MsgBox(VobServer)
                            'Start loop of new sql command
                            Try
                                If My.Computer.Network.Ping(VobServer) Then
                                    dbProvider = "provider = sqloledb;Data Source=" & VobServer & ";Initial Catalog=Windman;User ID=user;Password=pass"
                                    sql = txtQuery.Text
                                    con = New OleDb.OleDbConnection(dbProvider)
                                    con.Open()
                                    da = New OleDb.OleDbDataAdapter(sql, con)
                                    da.Fill(ds, "QueryResult")
                                    GridView1.DataSource = ds.Tables("QueryResult").DefaultView
                                    GridView1.DataBind()
                                Else

                                End If
                            Catch ex As Exception
                                'txtError.Text = ""
                                'txtDateTime.Text = ""
                                'txtError.Text = VobServer & " " & ex.Message
                                'txtDateTime.Text = Date.Now
                                'SqlDataSource1.Insert()
                            End Try
                            'displaying the data from the table
                        End While
                        dr.Close()
                        myConnection.Close()
                    Catch ex As Exception
                        'txtError.Text = ""
                        'txtDateTime.Text = ""
                        'txtError.Text = ex.Message
                        'txtDateTime.Text = Date.Now
                        'SqlDataSource1.Insert()
                    End Try
End If

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Question by:NCSA SCADA
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LVL 13

Expert Comment

by:gamarrojgq
ID: 35021478
Hi,

Try this

da.SelectCommand.CommandTimeout = 0

This will set NO TIME OUT for your query, but be careful because since there is no time out it could get stuck if the query does not respond.

Hope that helps
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Author Comment

by:NCSA SCADA
ID: 35021724
Hmm ..... thanks - I will give it a try
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Author Comment

by:NCSA SCADA
ID: 35021748
would it be placed after
da = New OleDb.OleDbDataAdapter(sql, con)
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LVL 13

Expert Comment

by:gamarrojgq
ID: 35021777
Yes, just before you call the Fill method
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Author Comment

by:NCSA SCADA
ID: 35021888
I still get an error.
Sys.WebForms.PageRequestManagerTimeoutException: The server request timed out
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LVL 13

Accepted Solution

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gamarrojgq earned 500 total points
ID: 35021931
Ok, then, the error is getting from your ScriptManager,  try this, change your ScriptManaget tag in you markup  with this

<asp:ScriptManager ID="ScriptManager1" AsyncPostBackTimeOut="36000" runat="server" />
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Author Closing Comment

by:NCSA SCADA
ID: 35022105
Thanks so much for the help.. have a good one
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