Data Sources

Is there anyway to use a Class File (VB.Net or C# class that generates a
DataSet) as the data source for a SQL Server 2005 Reporting Services report?
If there is, where are some examples or how-to's?
The only obvious way I see to generate a Data Source for a SQL report is a
sproc or dynamic query.
Thank You.Alex,
You want to use a Custom Data Processing Extension. You can even tie
the extension to an existing data layer.
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/RSPROG/htm/rsp_prog_extend_dataproc_5c2q.asp
Andy Potter

Data Read / Write problem with concurrent users on with dll

Hi,

I have a web app, that runs fine, except for one particular section that uses a class called by an event in the code behind. The class resides as a dll in the bin folder.

We had no problems during testing, when only one user was running this dll. Problems soon occurred when multiple users tried running it. Here's the error & stack:

06/02/2007 09:25:26 ==> cburns ==> There is already an open DataReader associated with this Command which must be closed first. at System.Data.SqlClient.SqlInternalConnectionTds.ValidateConnectionForExecute(SqlCommand command)
at System.Data.SqlClient.SqlConnection.ValidateConnectionForExecute(String method, SqlCommand command)
at System.Data.SqlClient.SqlCommand.ValidateCommand(String method, Boolean async)
at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, DbAsyncResult result)
at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method)
at System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior, String method)
at System.Data.SqlClient.SqlCommand.ExecuteReader()
at ESP.Validator.Data.DatabaseEvents.DatabaseEventManager.Read(IEventable eventObject, Int16 eventType, DateTime earliestDate, DateTime latestDate) in C:\My Path\Validator\Validator.NET\Data\DatabaseEvents\DatabaseEventManager.cs:line 92
at ESP.Validator.Data.Translink.CATCard.GetDespatchDate() in C:\My Path\Projects\Validator\Validator.NET\Data\Translink\CATCard.cs:line 94
at ESP.Validator.Data.Translink.ExistingSchemeEntitlement.ReadCards() in C:\My Path\Projects\Validator\Validator.NET\Data\Translink\ExistingSchemeEntitlement.cs:line 215
at ESP.Validator.Data.Translink.ExistingSchemeEntitlement.Read() in C:\My Path\Projects\Validator\Validator.NET\Data\Translink\ExistingSchemeEntitlement.cs:line 147
at ESP.Validator.Data.Translink.TranslinkApplicant.ReadEntitlements() in C:\My Path\Projects\Validator\Validator.NET\Data\Translink\TranslinkApplicant.cs:line 369
at ESP.Validator.Data.Translink.TranslinkApplicant.Read() in C:\My Path\Projects\Validator\Validator.NET\Data\Translink\TranslinkApplicant.cs:line 353
at ESP.Validator.Data.Translink.PrePrintedLetter.Read() in C:\My Path\Projects\Validator\Validator.NET\Data\Translink\PrePrintedLetter.cs:line 282
at ESP.Validator.ValidationProcessor.Read(ValidationSubject subject) in C:\My Path\Projects\Validator\Validator.NET\ValidationProcessor.cs:line 82
at clear_applications_scan_applications.ProcessValidation()

It seems the data reader is getting reused. We have ensured after each read the reader is closed. Though all users are using the same connection string. Could it be a connection pool problem, with the connection being overwritten during execution? Should i edit it according to the users logon?

I am really at a loss for ideas, and I don't mind admitting I am a bit out of my depth with this one!!

Any ideas/suggestions would be greatly appreciated.

Thanks

Hi Assimalyst,

Based on the exception message, we can see that this is not because of reusing of the SqlDataReader, but reusing the SqlConnection.

Generally, on a single SqlConnection, there can only be 1 open SqlDataReader exist at the same time. If a using is trying to open another one, this exception is thrown.

In ADO.NET 2.0, a new concept is involved called Multiple Active Result Sets (MARS). This enables you open multiple DataReaders on a single connection. To achieve this, you only need to add "MultipleActiveResultSets=True" in your connection string. That will prevent the exception from being thrown.

Please check the following links for more information:

http://msdn2.microsoft.com/en-us/library/cfa084cz.aspx

HTH. If anything is unclear, please feel free to mark this post as Not Answered and post your reply. Thanks!

sql

Data input problem

In Visual Web Developer Ihave created a data input form based on the documentation I found in the .NETFramework Class Library (SqlDataSource.InsertCommand Property). Originally my form contained 4 textboxes(FirstName, LastName, Phone, Email) and worked fine. All this data is nvarchar string data.

When I added a checkbox Iget an error that"Stringwas not recognized as a valid Boolean" when the checkbox is checked. When the checkbox is unchecked the data is input without a problem. This is a bit data field in the table.

Here is my VB code, InsertParameters for my SqlDataSource1, and button code:

<scriptrunat="server">

PrivateSub InsertData(ByValSourceAsObject,ByVal eAsEventArgs)

SqlDataSource1.Insert()

EndSub

</script>

<InsertParameters>

<asp:formParameterName="FirstName"Type="String"FormField="txtFirstName"/>

<asp:formParameterName="LastName"Type="String"FormField="txtLastName"/>

<asp:formParameterName="Phone"Type="String"FormField="txtPhone"/>

<asp:formParameterName="Email"Type="String"FormField="txtEmail"/>

<asp:formParameterName="FreeInfo"Type="Boolean"FormField="checkbox1"/>

</InsertParameters>

<asp:Buttonid="Button1"runat="server"text="Submit"OnClick="insertdata"/>

I suspect that the problemis with the VB code which will only accept string input data, but don't knowhow to fix it. Any thoughts on how tofix this problem? Thanks in advance forany help provided.

Check box return "On" whener page is postback

It does'nt return checked or unchecked.

You have to check this checkBox by code before inserting the data.

If checkBox is checked set the parametervalue = 1 else 0 .

Thank

Kunal

|||

Thanks for your feedback. I tried to implement your suggestions, but get this error message:

String was not recognized as a valid Boolean.

Here is my new VB code:

Private Sub InsertName(ByVal Source As Object, ByVal e As EventArgs)
If (CheckBox1.Checked = True) Then
CheckBox1.Equals(1)
Else : CheckBox1.Equals(0)
End If
SqlDataSource1.Insert()
End Sub

I am a newbie to VB, so my codeprobably doesn't accurately implement your recommendations. Any helpyou can provide in getting this to work will be greatly appreciated.

|||

Hi,

The formParameter always gets value from the Text property of the controls. In this case, you can try to use ControlParameter instead.

<asp:controlParameter Name="FreeInfo" ControlId="checkbox1" PropertyName="Checked"/>

HTH. If this does not answer your question, please feel free to mark the post as Not Answered and reply. Thank you!

|||

Thanks Kevin. That's exactly what I needed.