DropDownList bound to one table, selected value from another table

Hi I am having a very frustrating problem with a DropDownList.  The DropDownList is bound to one SQL Server 2005 table.  I do this progromatically with the following code:

Public Sub EvaltrID()


Dim aType As String = txtAircraftType.SelectedValue Dim auth As String = Convert.ToInt32(MinLevel.Text)

Dim active As String = "True"

Dim iPilot As String = "True"

Dim CrewPos As String = txtCrewPos.SelectedValue

Dim CrewPos1 As String = "SO"

Dim instructSO As String = "True"

Dim sesType As String = txtSessionType.Text

Dim sesType1 As String = "aqplc"

Dim sesType2 As String = "lc"

Dim program As String = txtProgram.Text

Dim program1 As String = "cq"

Dim program2 As String = "qc"

Dim oConn As SqlConnection

Dim oComm As SqlCommand

Dim oReader As SqlDataReader

Dim sSQL As String

Dim sConn As String

sSQL = "SELECT EvaltrID, convert(varchar, EvaltrID) + ' ' + LastName + ', ' + FirstName as info, AircraftType, IsActive, InstructorPilot, InstructorSO, [Authorization] FROM tlkpEvaltrID WHERE AircraftType = '" & aType & "' And [Authorization] >= " & auth & " And IsActive = '" & active & "' And InstructorPilot= '" & iPilot & "' And '" & CrewPos & "' <> '" & CrewPos1 & "' Or AircraftType='" & aType & "' And [Authorization] >= " & auth & " And IsActive = '" & active & "'And InstructorSO = '" & instructSO & "'And '" & CrewPos & "' = '" & CrewPos1 & "'And '" & sesType & "' <> '" & sesType1 & "'Or AircraftType = '" & aType & "'And [Authorization] >= " & auth & " And IsActive = '" & active & "'And InstructorPilot = '" & iPilot & "' And '" & CrewPos & "' = '" & CrewPos1 & "'And '" & sesType & "' = '" & sesType1 & "'Or '" & sesType & "' = '" & sesType2 & "'And '" & program & "' = '" & program1 & "'Or '" & program & "' = '" & program2 & "' ORDER BY LastName"

sConn = ConfigurationManager.ConnectionStrings("svtppdbSQLConnectionString2").ConnectionString


oConn =
New SqlConnection(sConn)


ddlEvaltrID.DataTextField = "info"

ddlEvaltrID.DataValueField = "EvaltrID"

oComm = New SqlCommand(sSQL, oConn)

oReader = oComm.ExecuteReader()

ddlEvaltrID.DataSource = oReader



Catch ex As Exception

lblMessage.Text = ex.Message

End Try


End Sub

 I then use a DataReader to choose a selected value for the DropDownList when the page loads.  This value comes from another table.

Dim conn As SqlConnection Dim sqlCmd As SqlCommand

Dim Reader As SqlDataReader

conn = New SqlConnection(ConfigurationManager.ConnectionStrings("svtppdbSQLConnectionString2").ConnectionString)

sqlCmd = New SqlCommand("SELECT * from tblSession where SessionID='" & inputnumber1 & "'", conn)


Reader = sqlCmd.ExecuteReader(CommandBehavior.CloseConnection)


If Reader.HasRows Then

If Reader("PilotEvaltrID") Is DBNull.Value And (txtCrewPos.SelectedValue = "CA" Or txtCrewPos.SelectedValue = "FO") Then


ddlEvaltrID.SelectedValue = Reader("PilotEvaltrID")

ddlEvaltrID.Enabled = False

End If

End If

I am having such a hard time with this. I'm getting this error message:  'ddlEvaltrID' has a SelectedValue which is invalid because it does not exist in the list of items. Parameter name: value.  I know what this means.  I know that it means that PilotEvaltrID column does not exist in the data that is currently bound to the DropDownList.  But, I'm unsure what to do.  Should I use a join statement?  I've found a ton of info on this in this forum, but nothing that helps me with the particular situation I face.  Does anyone have any advice for me??  Thanks.

Holly Quinn
4/7/2009 3:07:13 PM
asp.net.object-datasource 16182 articles. 0 followers. Follow

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Why don't you do a join when running your query and set the text and value at the same time?

Joseph Baggett


MCSD, MCPD: Web Developer, MCITP: Database Developer, MCTS: SQL Server 2005, MCTS: .NET 2.0 Web Applications, MCTS: .NET Framework 2.0 Windows Applications, MCTS: .NET Framework 2.0 Windows Applications, MCAD, MCP

If the project doesn't work, blame Scott Guthrie and/or refer to the problem solving flowsheet. O.~
4/8/2009 7:27:03 PM

Joseph Baggett:

Why don't you do a join when running your query and set the text and value at the same time?

I did try doing a join but I got the same error.  Here's the code I wrote for that.  Am I doing it incorrectly?

sqlCmd = New SqlCommand("select tlkpEvaltrID.LastName, tlkpEvaltrID.FirstName, tlkpEvaltrID.EvaltrID, tblSession.PilotEvaltrID, tblSession.SessionID from tlkpEvaltrID Inner Join tblSession on tlkpEvaltrID.EvaltrID = tblSession.PilotEvaltrID where tblSession.SessionID= '" & inputnumber1 & "'", conn)


Reader = sqlCmd.ExecuteReader(CommandBehavior.CloseConnection)


If Reader("PilotEvaltrID") Is DBNull.Value And (txtCrewPos.SelectedValue = "CA" Or txtCrewPos.SelectedValue = "FO") Then


ddlEvaltrID.SelectedValue = Reader("EvaltrID")

ddlEvaltrID.Enabled = False

End If



Holly Quinn
4/8/2009 7:56:32 PM

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