Datagrid and Bound ComboBox Columns

G

Guest

Hi, I have a tough one..

I have a datagrid that is bound to a typed dataset the following way

Dim ds as New MyDataSe

Datagrid.Datasource = d
Datagrid.DataMembre = "BonReception" 'A datatable from my datase

In that datagrid I have to combobox column (they come from a class I have made) and the combobox are bound like this

ComboBoxColumn.ComboBox.DataSource = d
ComboBoxColumn.ComboBox.DisplayMember = "Intervenant.TypeIntervenant" 'Another datatable from my datase
ComboBoxColumn.ComboBox.ValueMember = "Intervenant.ID
ComboBoxColumn.ComboBox.DataBindings.Add("SelectedValue", ds, "BonReception.TypeIntervenantID"

The second combobox column's combobox use a data relation between the table Intervenant and IntervenantDetai

ComboBoxColumn.ComboBox.DataSource = d
ComboBoxColumn.ComboBox.DisplayMember = "Intervenant.IntervenantIntervenantDetail.Intervenant" ComboBoxColumn.ComboBox.ValueMember = "Intervenant.IntervenantIntervenantDetail.ID
ComboBoxColumn.ComboBox.DataBindings.Add("SelectedValue", ds, "BonReception.IntervenantDetailID"

The comboboxes in each column behave as expected, if you select a TypeIntervenant in the first combobox, the second combobox only displays the Intervenant that match the selected TypeIntervenant in the first combobox

The problem is this,

the data is displayed in the first combobox column, but only in the first row of the second combobox column. If I click in the first column on the second row then in the second column the first row will go blank and the second row will display it's value. If I click in the second column at any row the combobox shows up with the right value for that row

If I remove the data relation between table Intervenant and IntervenantDetail, the data is displayed correctly and everything behave as expected. But I don't have the relation between the two combobox columns and I need that

Here is the code for my ComboBoxColumn Class

Public Class DataGridFormattableComboBoxColum
Inherits DataGridColumnStyl

Private isEditing As Boolea
Private isReadOnly As Boolea
Private _cm As CurrencyManage
Private _RowNum As Intege

Private WithEvents _ComboBox As New NoTabComboBo

Public Event SetCellFormat As FormatCellEventHandle
Public Event CurrentCellDataChanged(ByVal MappingName As String, ByVal Data As Object

Public Sub New(
MyBase.New(

ComboBox.Visible = Fals
End Su

Public Property ComboBox() As NoTabComboBo
Ge
Return _ComboBo
End Ge
Set(ByVal Value As NoTabComboBox
_ComboBox = Valu
End Se
End Propert

Protected Overrides Sub Abort(ByVal rowNum As Integer
isEditing = Fals
Invalidate(
End Su

Protected Overrides Function Commit(ByVal dataSource As CurrencyManager, ByVal rowNum As Integer) As Boolea
ComboBox_Leave(Nothing, Nothing
Return Tru
End Functio

Protected Overloads Overrides Sub Edit(ByVal [source] As CurrencyManager, ByVal rowNum As Integer, ByVal bounds As Rectangle,
ByVal [readOnly] As Boolean, ByVal instantText As String, ByVal cellIsVisible As Boolean
Dim value As Strin

If Me.isEditing The
Exit Su
End I

If MyBase.ReadOnly The
Exit Su
End I

_cm = sourc
_RowNum = rowNu

If IsDBNull(GetColumnValueAtRow([source], rowNum)) The
value = MyBase.NullTex

If ComboBox.DataSource Is Nothing And Not ComboBox.Items.Contains(value) The
ComboBox.Items.Insert(0, value
End I
Els
value = CType(GetColumnValueAtRow([source], rowNum), String
End I

If cellIsVisible The
ComboBox.Bounds = New Rectangle(bounds.X, bounds.Y, bounds.Width, bounds.Height - 2

ComboBox.Text = valu
ComboBox.Visible = Tru
ComboBox.Focus(
Els
ComboBox.Text = valu
ComboBox.Visible = Fals
End I
End Su

Protected Overrides Function GetPreferredSize(ByVal g As Graphics, ByVal value As Object) As Siz
Return New Size(100, ComboBox.PreferredHeight + 1
End Functio

Protected Overrides Function GetMinimumHeight() As Integer
Return ComboBox.PreferredHeight + 1
End Function

Protected Overrides Function GetPreferredHeight(ByVal g As Graphics, ByVal value As Object) As Integer
Return ComboBox.PreferredHeight + 1
End Function

Protected Overloads Overrides Sub Paint(ByVal g As Graphics, ByVal bounds As Rectangle, ByVal [source] As CurrencyManager, ByVal rowNum As Integer)
Paint(g, bounds, [source], rowNum, False)
End Sub

Protected Overloads Overrides Sub Paint(ByVal g As Graphics, ByVal bounds As Rectangle, ByVal [source] As CurrencyManager, ByVal rowNum As Integer, ByVal alignToRight As Boolean)
Paint(g, bounds, [source], rowNum, Brushes.Red, Brushes.Blue, alignToRight)
End Sub

Protected Overloads Overrides Sub Paint(ByVal g As Graphics, ByVal bounds As Rectangle, ByVal [source] As CurrencyManager, ByVal rowNum As Integer, ByVal backBrush As Brush, ByVal foreBrush As Brush, ByVal alignToRight As Boolean)
Dim str As Object
Dim rect As Rectangle = bounds

Dim e As DataGridFormatCellEventArgs

e = New DataGridFormatCellEventArgs(source, rowNum, Me.MappingName, Me.DataGridTableStyle.DataGrid.Font, backBrush, foreBrush)

RaiseEvent SetCellFormat(Me, e)

str = GetColumnValueAtRow([source], rowNum)

If IsDBNull(str) Then
str = MyBase.NullText
End If

If Not e.UseBaseClassDrawing Then
g.FillRectangle(e.BackBrush, rect)
Else
g.FillRectangle(backBrush, rect)
End If

rect.Offset(0, 2)
rect.Height -= 2

Try
If Not e.UseBaseClassDrawing Then
g.DrawString(str, e.TextFont, e.ForeBrush, RectangleF.FromLTRB(rect.X, rect.Y, rect.Right, rect.Bottom))
Else
g.DrawString(str, Me.DataGridTableStyle.DataGrid.Font, foreBrush, RectangleF.FromLTRB(rect.X, rect.Y, rect.Right, rect.Bottom))
End If
Catch ex As Exception
MsgBox(ex.Message)
End Try
End Sub

Protected Overrides Sub SetDataGridInColumn(ByVal value As DataGrid)
MyBase.SetDataGridInColumn(value)
If Not (ComboBox.Parent Is Nothing) Then
ComboBox.Parent.Controls.Remove(ComboBox)
End If
If Not (value Is Nothing) Then
value.Controls.Add(ComboBox)
End If
End Sub

Private Sub ComboBox_SelectedValueChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles _ComboBox.SelectedValueChanged
If ComboBox.Modified Then
Me.isEditing = True
MyBase.ColumnStartedEditing(ComboBox)
End If
End Sub

Protected Overrides Function GetColumnValueAtRow(ByVal source As System.Windows.Forms.CurrencyManager, ByVal rowNum As Integer) As Object
If Not Me.ComboBox.DataSource Is Nothing Then
Try
Dim obj As Object = MyBase.GetColumnValueAtRow(source, rowNum)
Dim i As Integer
Dim DataMember As String
Dim ValueColName As String
Dim DisplayColName As String
Dim cm As CurrencyManager
Dim dView As DataView

If Me.ComboBox.DisplayMember.IndexOf(".") > -1 Then
DataMember = Me.ComboBox.DisplayMember.Substring(0, Me.ComboBox.DisplayMember.LastIndexOf("."))
DisplayColName = Me.ComboBox.DisplayMember.Substring(Me.ComboBox.DisplayMember.LastIndexOf(".") + 1)
Else
DisplayColName = Me.ComboBox.DisplayMember
End If

If Me.ComboBox.ValueMember.IndexOf(".") > -1 Then
ValueColName = Me.ComboBox.ValueMember.Substring(Me.ComboBox.ValueMember.LastIndexOf(".") + 1)
Else
ValueColName = Me.ComboBox.ValueMember
End If

If Me.ComboBox.DataSource.GetType.ToString.EndsWith("dsBonReception") Then
cm = CType(Me.DataGridTableStyle.DataGrid.BindingContext(Me.ComboBox.DataSource, DataMember), CurrencyManager)
Else
cm = CType(Me.DataGridTableStyle.DataGrid.BindingContext(Me.ComboBox.DataSource), CurrencyManager)
End If

dView = CType(cm.List, DataView)

For i = 0 To dView.Count - 1
If Not IsDBNull(obj) AndAlso Not IsDBNull(dView.Item(i).Item(ValueColName)) Then
If obj = 340 And dView.Item(i).Item(ValueColName) = 340 Then
Dim t As String
t = ""
End If
End If
If obj.Equals(dView.Item(i).Item(ValueColName)) Then
Exit For
End If
Next

If i < dView.Count Then
Return dView.Item(i).Item(DisplayColName)
End If

Return DBNull.Value
Catch ex As Exception
MsgBox(ex.Message)
End Try
Else
Return MyBase.GetColumnValueAtRow(source, rowNum)
End If
End Function

Protected Overrides Sub SetColumnValueAtRow(ByVal source As System.Windows.Forms.CurrencyManager, ByVal rowNum As Integer, ByVal value As Object)
If Not Me.ComboBox.DataSource Is Nothing Then
Try
Dim s As Object = value
Dim DataMember As String
Dim ValueColName As String
Dim DisplayColName As String
Dim cm As CurrencyManager
Dim i As Integer
Dim dView As DataView

If Me.ComboBox.DisplayMember.IndexOf(".") > -1 Then
DataMember = Me.ComboBox.DisplayMember.Substring(0, Me.ComboBox.DisplayMember.LastIndexOf("."))
DisplayColName = Me.ComboBox.DisplayMember.Substring(Me.ComboBox.DisplayMember.LastIndexOf(".") + 1)
Else
DisplayColName = Me.ComboBox.DisplayMember
End If

If Me.ComboBox.ValueMember.IndexOf(".") > -1 Then
ValueColName = Me.ComboBox.ValueMember.Substring(Me.ComboBox.ValueMember.LastIndexOf(".") + 1)
Else
ValueColName = Me.ComboBox.ValueMember
End If

If Me.ComboBox.DataSource.GetType.ToString.EndsWith("dsBonReception") Then
cm = CType(Me.DataGridTableStyle.DataGrid.BindingContext(Me.ComboBox.DataSource, DataMember), CurrencyManager)
Else
cm = CType(Me.DataGridTableStyle.DataGrid.BindingContext(Me.ComboBox.DataSource), CurrencyManager)
End If

dView = CType(cm.List, DataView)

For i = 0 To dView.Count - 1
If s.Equals(dView.Item(i).Item(ValueColName)) Then
Exit For
End If
Next

If i < dView.Count Then
If source.Position = rowNum Then
MyBase.SetColumnValueAtRow(source, rowNum, dView.Item(i).Item(ValueColName))
End If
Else
If source.Position = rowNum Then
MyBase.SetColumnValueAtRow(source, rowNum, DBNull.Value)
End If
End If

Catch ex As Exception
MsgBox(ex.Message)
End Try
Else
MyBase.SetColumnValueAtRow(source, rowNum, value)
End If
End Sub

Private Sub ComboBox_Leave(ByVal sender As Object, ByVal e As System.EventArgs) Handles _ComboBox.Leave
If Not isEditing Then
ComboBox.Hide()
Exit Sub
End If

isEditing = False

Try
Dim value As Object = ComboBox.SelectedValue

If Not value Is Nothing Then
SetColumnValueAtRow(_cm, _RowNum, value)
RaiseEvent CurrentCellDataChanged(MyBase.MappingName, value)
Else
EnterNullValue()
RaiseEvent CurrentCellDataChanged(MyBase.MappingName, DBNull.Value)
End If
Catch
End Try

Invalidate()
ComboBox.Hide()
End Sub

'
' ComboBox class removing the tab key
'
Public Class NoTabComboBox
Inherits ComboBox

Private pModified As Boolean
Private KeyPressed As Boolean
Private MouseClicked As Boolean

Sub New()
pModified = False
KeyPressed = False
MouseClicked = False
End Sub

Protected Overrides Sub RefreshItem(ByVal index As Integer)
MyBase.RefreshItem(index)
End Sub

Protected Overrides Sub SetItemsCore(ByVal items As System.Collections.IList)
MyBase.SetItemsCore(items)
End Sub

Protected Overrides Function ProcessKeyMessage(ByRef m As System.Windows.Forms.Message) As Boolean
If m.Msg = &H101 Then '&H101 = WM_KEYUP
If m.WParam.ToInt32 = 9 Then '9 = TABKEY
Return True
End If
End If
Return MyBase.ProcessKeyMessage(m)
End Function

Public ReadOnly Property Modified() As Boolean
Get
Modified = pModified
End Get
End Property

Protected Overrides Sub OnClick(ByVal e As System.EventArgs)
MouseClicked = True
End Sub

Protected Overrides Sub OnSelectedValueChanged(ByVal e As System.EventArgs)
If MouseClicked Or KeyPressed Then
pModified = True
MouseClicked = False
KeyPressed = False
Else
pModified = False
End If

MyBase.OnSelectedValueChanged(e)
End Sub

Protected Overrides Sub OnKeyPress(ByVal e As System.Windows.Forms.KeyPressEventArgs)
If Char.IsLetterOrDigit(e.KeyChar) Then
KeyPressed = True
End If

MyBase.OnKeyPress(e)
End Sub
End Class
End Class
 
R

Richard T. Edwards

Put this above the form load

Dim ds as New MyDataSet

Mike Hardy said:
Hi, I have a tough one...

I have a datagrid that is bound to a typed dataset the following way.

Dim ds as New MyDataSet

Datagrid.Datasource = ds
Datagrid.DataMembre = "BonReception" 'A datatable from my dataset

In that datagrid I have to combobox column (they come from a class I have
Click to expand...
made) and the combobox are bound like this.
ComboBoxColumn.ComboBox.DataSource = ds
ComboBoxColumn.ComboBox.DisplayMember = "Intervenant.TypeIntervenant"
Click to expand...
'Another datatable from my dataset
ComboBoxColumn.ComboBox.ValueMember = "Intervenant.ID"
ComboBoxColumn.ComboBox.DataBindings.Add("SelectedValue", ds, "BonReception.TypeIntervenantID")

The second combobox column's combobox use a data relation between the
Click to expand...
table Intervenant and IntervenantDetail
ComboBoxColumn.ComboBox.DataSource = ds
ComboBoxColumn.ComboBox.DisplayMember =
Click to expand...
"Intervenant.IntervenantIntervenantDetail.Intervenant"
ComboBoxColumn.ComboBox.ValueMember =
"Intervenant.IntervenantIntervenantDetail.ID"
ComboBoxColumn.ComboBox.DataBindings.Add("SelectedValue", ds, "BonReception.IntervenantDetailID")

The comboboxes in each column behave as expected, if you select a
Click to expand...
TypeIntervenant in the first combobox, the second combobox only displays the
Intervenant that match the selected TypeIntervenant in the first combobox.
The problem is this,

the data is displayed in the first combobox column, but only in the first
Click to expand...
row of the second combobox column. If I click in the first column on the
second row then in the second column the first row will go blank and the
second row will display it's value. If I click in the second column at any
row the combobox shows up with the right value for that row.
If I remove the data relation between table Intervenant and
Click to expand...
IntervenantDetail, the data is displayed correctly and everything behave as
expected. But I don't have the relation between the two combobox columns and
I need that.
Here is the code for my ComboBoxColumn Class.

Public Class DataGridFormattableComboBoxColumn
Inherits DataGridColumnStyle

Private isEditing As Boolean
Private isReadOnly As Boolean
Private _cm As CurrencyManager
Private _RowNum As Integer

Private WithEvents _ComboBox As New NoTabComboBox

Public Event SetCellFormat As FormatCellEventHandler
Public Event CurrentCellDataChanged(ByVal MappingName As String, ByVal Data As Object)

Public Sub New()
MyBase.New()

ComboBox.Visible = False
End Sub

Public Property ComboBox() As NoTabComboBox
Get
Return _ComboBox
End Get
Set(ByVal Value As NoTabComboBox)
_ComboBox = Value
End Set
End Property

Protected Overrides Sub Abort(ByVal rowNum As Integer)
isEditing = False
Invalidate()
End Sub

Protected Overrides Function Commit(ByVal dataSource As CurrencyManager,
Click to expand...
ByVal rowNum As Integer) As Boolean
ComboBox_Leave(Nothing, Nothing)
Return True
End Function

Protected Overloads Overrides Sub Edit(ByVal [source] As
Click to expand...
CurrencyManager, ByVal rowNum As Integer, ByVal bounds As Rectangle, _
ByVal [readOnly] As Boolean,
Click to expand...
ByVal instantText As String, ByVal cellIsVisible As Boolean)
Dim value As String

If Me.isEditing Then
Exit Sub
End If

If MyBase.ReadOnly Then
Exit Sub
End If

_cm = source
_RowNum = rowNum

If IsDBNull(GetColumnValueAtRow([source], rowNum)) Then
value = MyBase.NullText

If ComboBox.DataSource Is Nothing And Not
Click to expand...
ComboBox.Items.Contains(value) Then
ComboBox.Items.Insert(0, value)
End If
Else
value = CType(GetColumnValueAtRow([source], rowNum), String)
End If

If cellIsVisible Then
ComboBox.Bounds = New Rectangle(bounds.X, bounds.Y, bounds.Width, bounds.Height - 2)

ComboBox.Text = value
ComboBox.Visible = True
ComboBox.Focus()
Else
ComboBox.Text = value
ComboBox.Visible = False
End If
End Sub

Protected Overrides Function GetPreferredSize(ByVal g As Graphics, ByVal value As Object) As Size
Return New Size(100, ComboBox.PreferredHeight + 1)
End Function

Protected Overrides Function GetMinimumHeight() As Integer
Return ComboBox.PreferredHeight + 1
End Function

Protected Overrides Function GetPreferredHeight(ByVal g As Graphics,
Click to expand...
ByVal value As Object) As Integer
Return ComboBox.PreferredHeight + 1
End Function

Protected Overloads Overrides Sub Paint(ByVal g As Graphics, ByVal
Click to expand...
bounds As Rectangle, ByVal [source] As CurrencyManager, ByVal rowNum As
Integer)
Paint(g, bounds, [source], rowNum, False)
End Sub

Protected Overloads Overrides Sub Paint(ByVal g As Graphics, ByVal
Click to expand...
bounds As Rectangle, ByVal [source] As CurrencyManager, ByVal rowNum As
Integer, ByVal alignToRight As Boolean)
Paint(g, bounds, [source], rowNum, Brushes.Red, Brushes.Blue, alignToRight)
End Sub

Protected Overloads Overrides Sub Paint(ByVal g As Graphics, ByVal
Click to expand...
bounds As Rectangle, ByVal [source] As CurrencyManager, ByVal rowNum As
Integer, ByVal backBrush As Brush, ByVal foreBrush As Brush, ByVal
alignToRight As Boolean)
Dim str As Object
Dim rect As Rectangle = bounds

Dim e As DataGridFormatCellEventArgs

e = New DataGridFormatCellEventArgs(source, rowNum, Me.MappingName,
Click to expand...
Me.DataGridTableStyle.DataGrid.Font, backBrush, foreBrush)
RaiseEvent SetCellFormat(Me, e)

str = GetColumnValueAtRow([source], rowNum)

If IsDBNull(str) Then
str = MyBase.NullText
End If

If Not e.UseBaseClassDrawing Then
g.FillRectangle(e.BackBrush, rect)
Else
g.FillRectangle(backBrush, rect)
End If

rect.Offset(0, 2)
rect.Height -= 2

Try
If Not e.UseBaseClassDrawing Then
g.DrawString(str, e.TextFont, e.ForeBrush,
Click to expand...
RectangleF.FromLTRB(rect.X, rect.Y, rect.Right, rect.Bottom))
Else
g.DrawString(str, Me.DataGridTableStyle.DataGrid.Font, foreBrush,
Click to expand...
RectangleF.FromLTRB(rect.X, rect.Y, rect.Right, rect.Bottom))
End If
Catch ex As Exception
MsgBox(ex.Message)
End Try
End Sub

Protected Overrides Sub SetDataGridInColumn(ByVal value As DataGrid)
MyBase.SetDataGridInColumn(value)
If Not (ComboBox.Parent Is Nothing) Then
ComboBox.Parent.Controls.Remove(ComboBox)
End If
If Not (value Is Nothing) Then
value.Controls.Add(ComboBox)
End If
End Sub

Private Sub ComboBox_SelectedValueChanged(ByVal sender As Object, ByVal
Click to expand...
e As System.EventArgs) Handles _ComboBox.SelectedValueChanged
If ComboBox.Modified Then
Me.isEditing = True
MyBase.ColumnStartedEditing(ComboBox)
End If
End Sub

Protected Overrides Function GetColumnValueAtRow(ByVal source As
Click to expand...
System.Windows.Forms.CurrencyManager, ByVal rowNum As Integer) As Object
If Not Me.ComboBox.DataSource Is Nothing Then
Try
Dim obj As Object = MyBase.GetColumnValueAtRow(source, rowNum)
Dim i As Integer
Dim DataMember As String
Dim ValueColName As String
Dim DisplayColName As String
Dim cm As CurrencyManager
Dim dView As DataView

If Me.ComboBox.DisplayMember.IndexOf(".") > -1 Then
DataMember = Me.ComboBox.DisplayMember.Substring(0, Me.ComboBox.DisplayMember.LastIndexOf("."))
DisplayColName =
Click to expand...
Me.ComboBox.DisplayMember.Substring(Me.ComboBox.DisplayMember.LastIndexOf(".
") + 1)
Else
DisplayColName = Me.ComboBox.DisplayMember
End If

If Me.ComboBox.ValueMember.IndexOf(".") > -1 Then
ValueColName =
Click to expand...
Me.ComboBox.ValueMember.Substring(Me.ComboBox.ValueMember.LastIndexOf(".") +
1)
Else
ValueColName = Me.ComboBox.ValueMember
End If

If
Click to expand...
Me.ComboBox.DataSource.GetType.ToString.EndsWith("dsBonReception") Then
cm =
Click to expand...
CType(Me.DataGridTableStyle.DataGrid.BindingContext(Me.ComboBox.DataSource,
DataMember), CurrencyManager)
Else
cm = CType(Me.DataGridTableStyle.DataGrid.BindingContext(Me.ComboBox.DataSource),
CurrencyManager)
End If

dView = CType(cm.List, DataView)

For i = 0 To dView.Count - 1
If Not IsDBNull(obj) AndAlso Not
Click to expand...
IsDBNull(dView.Item(i).Item(ValueColName)) Then
If obj = 340 And dView.Item(i).Item(ValueColName) = 340 Then
Dim t As String
t = ""
End If
End If
If obj.Equals(dView.Item(i).Item(ValueColName)) Then
Exit For
End If
Next

If i < dView.Count Then
Return dView.Item(i).Item(DisplayColName)
End If

Return DBNull.Value
Catch ex As Exception
MsgBox(ex.Message)
End Try
Else
Return MyBase.GetColumnValueAtRow(source, rowNum)
End If
End Function

Protected Overrides Sub SetColumnValueAtRow(ByVal source As
Click to expand...
System.Windows.Forms.CurrencyManager, ByVal rowNum As Integer, ByVal value
As Object)
If Not Me.ComboBox.DataSource Is Nothing Then
Try
Dim s As Object = value
Dim DataMember As String
Dim ValueColName As String
Dim DisplayColName As String
Dim cm As CurrencyManager
Dim i As Integer
Dim dView As DataView

If Me.ComboBox.DisplayMember.IndexOf(".") > -1 Then
DataMember = Me.ComboBox.DisplayMember.Substring(0, Me.ComboBox.DisplayMember.LastIndexOf("."))
DisplayColName =
Click to expand...
Me.ComboBox.DisplayMember.Substring(Me.ComboBox.DisplayMember.LastIndexOf(".
") + 1)
Else
DisplayColName = Me.ComboBox.DisplayMember
End If

If Me.ComboBox.ValueMember.IndexOf(".") > -1 Then
ValueColName =
Click to expand...
Me.ComboBox.ValueMember.Substring(Me.ComboBox.ValueMember.LastIndexOf(".") +
1)
Else
ValueColName = Me.ComboBox.ValueMember
End If

If
Click to expand...
Me.ComboBox.DataSource.GetType.ToString.EndsWith("dsBonReception") Then
cm =
Click to expand...
CType(Me.DataGridTableStyle.DataGrid.BindingContext(Me.ComboBox.DataSource,
DataMember), CurrencyManager)
Else
cm = CType(Me.DataGridTableStyle.DataGrid.BindingContext(Me.ComboBox.DataSource),
CurrencyManager)
End If

dView = CType(cm.List, DataView)

For i = 0 To dView.Count - 1
If s.Equals(dView.Item(i).Item(ValueColName)) Then
Exit For
End If
Next

If i < dView.Count Then
If source.Position = rowNum Then
MyBase.SetColumnValueAtRow(source, rowNum, dView.Item(i).Item(ValueColName))
End If
Else
If source.Position = rowNum Then
MyBase.SetColumnValueAtRow(source, rowNum, DBNull.Value)
End If
End If

Catch ex As Exception
MsgBox(ex.Message)
End Try
Else
MyBase.SetColumnValueAtRow(source, rowNum, value)
End If
End Sub

Private Sub ComboBox_Leave(ByVal sender As Object, ByVal e As
Click to expand...
System.EventArgs) Handles _ComboBox.Leave
If Not isEditing Then
ComboBox.Hide()
Exit Sub
End If

isEditing = False

Try
Dim value As Object = ComboBox.SelectedValue

If Not value Is Nothing Then
SetColumnValueAtRow(_cm, _RowNum, value)
RaiseEvent CurrentCellDataChanged(MyBase.MappingName, value)
Else
EnterNullValue()
RaiseEvent CurrentCellDataChanged(MyBase.MappingName, DBNull.Value)
End If
Catch
End Try

Invalidate()
ComboBox.Hide()
End Sub

'
' ComboBox class removing the tab key
'
Public Class NoTabComboBox
Inherits ComboBox

Private pModified As Boolean
Private KeyPressed As Boolean
Private MouseClicked As Boolean

Sub New()
pModified = False
KeyPressed = False
MouseClicked = False
End Sub

Protected Overrides Sub RefreshItem(ByVal index As Integer)
MyBase.RefreshItem(index)
End Sub

Protected Overrides Sub SetItemsCore(ByVal items As System.Collections.IList)
MyBase.SetItemsCore(items)
End Sub

Protected Overrides Function ProcessKeyMessage(ByRef m As
Click to expand...
System.Windows.Forms.Message) As Boolean
 

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