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VB,DataGridView,Drag and Drop,Reordering of rows

Posted on 2009-04-13
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Last Modified: 2013-11-25
I would llike to use drag  drop to reorder the students. (see sample Jpg file attached)
The studentNo field is the same as the row index plus 1, and the fill query for the DataGridView is
sorted by StudentNo, so the code just has to change the studentNo appropriately.
The best I can come up with so far is a button which lifts the selected row by one row.
(Similarly I can add a down button to do the reverse)
Repeated clickng of this button achieves the desired result but is not very user friendly.
Also I think the code (atached) is messy.
For drag and drop, I was looking for a mouse down event and Mouse up event to tell me the "from row" and the "to row" but the CurrentCell.RowIndex.Value is always a value behind
because the selected row does not change until after the mouse up event occurs.
Any ideas would be appreciated.
Private Sub ButMoveUp_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ButMoveUp.Click

        Dim JPCurrentRow As Int16 = CShort(EntriesDGV.CurrentRow.Index)
 

        If JPCurrentRow > 0 Then

            'Get Parameter in preparation for re-fill

            Dim ParmExamCode As String

            ParmExamCode = CStr(AvailExamsDGV.Item("AeDgvExamCode", AvailExamsDGV.CurrentCell.RowIndex).Value)

            ' Swap order one row

            Dim JPCurrentRowID As Int32 = CInt(EntriesDGV.Item("EntryID", JPCurrentRow).Value)

            Dim JPToRowID As Int32 = CInt(EntriesDGV.Item("EntryID", JPCurrentRow - 1).Value)
 

            Me.EntriesTableAdapter.QryUpdateStudentNo(JPCurrentRow, JPCurrentRowID)

            Me.EntriesTableAdapter.QryUpdateStudentNo(JPCurrentRow + CShort(1), JPToRowID)

            'EntriesDGV.Item("StudentNo", JPToRow).Value = JPToRow - 1

            'EntriesDGV.Item("StudentNo", JPToRow - 1).Value = JPToRow

            'Re-fill DataGrid view

            Me.EntriesTableAdapter.Fill(Me.ExamPlannerUserFileDataSet.Entries, ParmExamCode)

        Else

            MsgBox("Already on first Row")

        End If
 

    End Sub

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DataGridView.jpg
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Question by:Polyview
2 Comments
 
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Accepted Solution

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Dhaest earned 500 total points
ID: 24135291
Custom Row and Column Drag and Drop Reordering Operations with the DataGridView
http://www.danielsoper.com/programming/DataGridViewDragDropRowsColumns.aspx
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Expert Comment

by:surfbored
ID: 24304708
Does anyone have VB code for this same solution? The given link uses C#.

TIA.
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