?
Solved

Cannot bind to the new display member. Parameter name: newDisplayMember

Posted on 2014-02-27
4
Medium Priority
?
1,472 Views
Last Modified: 2014-02-28
I'm getting the above error while trying to load a ComboBox. It only occurs on the second execution of the LoadDirectionComboBox() Function. What does this mean? Below is the process of execution.

   'This Sub is executed from a Form Class
    Public Sub LoadDirectionComboBox()
        Try
            InitializeErrorClass(EH)
            BL.LoadDirectionComboBox(EH)

            If EH.DataSet.Tables(0).Rows.Count > 0 Then
                cmbDirection.DataSource = Nothing
                cmbDirection.DataSource = EH.DataSet.Tables(0)
                cmbDirection.DisplayMember = EH.DataSet.Tables(0).Columns(1).ColumnName
                cmbDirection.ValueMember = EH.DataSet.Tables(0).Columns(0).ColumnName
            End If

        Catch ex As Exception
            EH.ErrorMessage = "LoadDirectionComboBox() - " & ex.Message & "~E"
        End Try

        EH.ProcessMessages(Me, sbr, EH.ErrorMessage)
    End Sub
   '
   '
   'This Function initializes an Error Handling Class Objects and is in a Module File
    Public Function InitializeErrorClass(ByRef EH As ErrorHandling.ErrorHandler)
        Try
            EH.DataSet = New DataSet
            EH.DataTable = New DataTable
            EH.Exception = Nothing
            EH.ErrorMessage = ""
            EH.Character = ""
            EH.Bool = False
            EH.Number = 0

        Catch ex As Exception
            EH.ErrorMessage = "InitializeErrorClass() - " & ex.Message & "~E"
        End Try

        Return EH
    End Function
   '
   '
   'This Function resides in my Business Layer
    Public Function LoadDirectionComboBox(ByRef EH As ErrorHandling.ErrorHandler)
        Try
            Dim strFields As String = "direction_ID,direction"
            Dim strTableID As String = "LKUP_Directions"
            Dim strCriteria As String = "active <> 0"
            Dim strOrderBy As String = ""

            DL.GetData(strTableID, strFields, strCriteria, strOrderBy, EH)

        Catch ex As Exception
            EH.ErrorMessage = "LoadDirectionComboBox() - " & ex.Message & "~E"
        End Try

        Return EH
    End Function
   '
   '
   'This Function resides in my Data Layer
    Public Function GetData(ByVal tbl As String, ByVal keyFld As String, ByVal criteria As String, ByVal orderBy As String, ByRef EH As ErrorHandling.ErrorHandler)
        Try
            Dim strCriteria As String = ""
            Dim strOrderBy As String = ""

            DBConnection(EH)

            If EH.Bool Then
                sSQL = "SELECT " & keyFld & " FROM " & tbl

                If criteria.Length > 0 Then
                    strCriteria = " WHERE " & criteria
                    sSQL &= strCriteria
                End If

                If orderBy.Length > 0 Then
                    strOrderBy = " ORDER BY " & orderBy
                    sSQL &= strOrderBy
                End If

                cmd = New SqlCommand(sSQL, cnn)
                adp = New SqlDataAdapter
                adp.SelectCommand = cmd
                adp.Fill(EH.DataSet, 0)
                'adp.Fill(EH.DataSet, "Temp")
            End If

        Catch ex As Exception
            EH.ErrorMessage = "GetData() - " & ex.Message & "...Contact Engineering!" & "~E"
        Finally
            cnn.Dispose()
        End Try

        Return EH
    End Function
   '
   '
   'This Function resides in my Data Layer
    Public Function DBConnection(ByRef EH As ErrorHandling.ErrorHandler)
        Try
            frm.Name = "frmMain"
            cnn = New SqlConnection
            EH.Bool = False

            With cnn
                .ConnectionString = strCNN
                .Open()
                EH.Bool = True
            End With

        Catch ex As Exception
            EH.ErrorMessage = "DBConnection() - " & ex.Message & "...Contact Engineering!" & "~E"
        End Try

        Return EH
    End Function

Open in new window

0
Comment
Question by:BlakeMcKenna
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
  • 2
4 Comments
 
LVL 83

Expert Comment

by:CodeCruiser
ID: 39894474
Try changing following

cmbDirection.DisplayMember = EH.DataSet.Tables(0).Columns(1).ColumnName
cmbDirection.ValueMember = EH.DataSet.Tables(0).Columns(0).ColumnName

to

Dim dispMember  As String = EH.DataSet.Tables(0).Columns(1).ColumnName
Dim valMember As String = EH.DataSet.Tables(0).Columns(0).ColumnName
cmbDirection.DisplayMember = dispMember
cmbDirection.ValueMember = valMember
0
 

Author Comment

by:BlakeMcKenna
ID: 39894901
I actually got it working. I moved the DataSource assignment statement beneath the DisplayMember/ValueMember statements and that seemed to work. Not sure why though...
0
 
LVL 83

Accepted Solution

by:
CodeCruiser earned 2000 total points
ID: 39894958
Yes that would have been my next option. On random occasions, this fixes the issue especially when reassigning/repopulating the combobox.
0
 

Author Closing Comment

by:BlakeMcKenna
ID: 39894975
Thanks for your help!
0

Featured Post

VIDEO: THE CONCERTO CLOUD FOR HEALTHCARE

Modern healthcare requires a modern cloud. View this brief video to understand how the Concerto Cloud for Healthcare can help your organization.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

This tutorial demonstrates one way to create an application that runs without any Forms but still has a GUI presence via an Icon in the System Tray. The magic lies in Inheriting from the ApplicationContext Class and passing that to Application.Ru…
A while ago, I was working on a Windows Forms application and I needed a special label control with reflection (glass) effect to show some titles in a stylish way. I've always enjoyed working with graphics, but it's never too clever to re-invent …
Have you created a query with information for a calendar? ... and then, abra-cadabra, the calendar is done?! I am going to show you how to make that happen. Visualize your data!  ... really see it To use the code to create a calendar from a q…
In this video, Percona Solutions Engineer Barrett Chambers discusses some of the basic syntax differences between MySQL and MongoDB. To learn more check out our webinar on MongoDB administration for MySQL DBA: https://www.percona.com/resources/we…
Suggested Courses

764 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question