weird combo box bind error

[Ken Powers]

Hello everyone,

I'm getting a strange error when I try to bind a combo box to a Dataset.
Here's my code!

Private Sub Get_Data()
Try
Dim sqlcmd = New SqlCommand("Select * from Utility order by
Utility", sqlConn)

daDataAdapter = New SqlDataAdapter
daDataAdapter.SelectCommand = sqlcmd

dsDataSet = New Dataset
daDataAdapter.Fill(dsDataSet, "Utility")
sqlcmd = New SqlCommand("Select * from Adjustments", sqlConn)
daDataAdapter = New SqlDataAdapter
daDataAdapter.SelectCommand = sqlcmd

daDataAdapter.Fill(dsDataSet, "Adjustments")

daRel = New DataRelation("UtilAdjust",
dsDataSet.Tables("Utility").Columns("Code"),
dsDataSet.Tables("Adjustments").Columns("Code"))
dsDataSet.Relations.Add(daRel)

Set_Update_Command()
Set_Insert_Command()
Set_Delete_Command()

Catch ex As Exception
MessageBox.Show(ex.Source.ToString & " - " & ex.Message,
Application.ProductName, _
MessageBoxButtons.OK, MessageBoxIcon.Error)
End Try

End Sub

Private Sub BindFields()
Try
Dim ctrl As Control
For Each ctrl In Me.Controls
If TypeOf ctrl Is TextBox Then
ctrl.DataBindings.Clear()
ctrl.Text = ""
End If
Next

cbUtility.DataBindings.Clear()
cbType.DataBindings.Clear()

For Each ctrl In Me.GroupBox1.Controls
If TypeOf ctrl Is TextBox Then
ctrl.DataBindings.Clear()
ctrl.Text = ""
End If
Next

cbUtility.DataSource = dsDataSet.Tables("Utility")
cbUtility.DisplayMember = "UTILITY"
cbUtility.ValueMember = "CODE"

tbAN.DataBindings.Add("Text", dsDataSet,
"Utility.UtilAdjust.AdjustmentName")
lblAK.DataBindings.Clear()
lblAK.DataBindings.Add("Text", dsDataSet,
"Utility.UtilAdjust.AdjKey")

BindDate(tbASD, "UTILITY.UtilAdjust.AdjStartDate")
BindDate(tbAED, "UTILITY.UtilAdjust.AdjEndDate")

BindCurr(tbAA, "UTILITY.UtilAdjust.adjustment")

BindType(cbType, "UTILITY.UtilAdjust.type")

bmUtil = Me.BindingContext(dsDataSet, "Utility")
bmAdjust = Me.BindingContext(dsDataSet, "UTILITY.UtilAdjust")

AddHandler Me.BindingContext(dsDataSet,
"Utility").PositionChanged, _
AddressOf dtUtil_PositionChanged

Catch ex As Exception
MessageBox.Show(ex.Source.ToString & " - " & ex.Message,
Application.ProductName, _
MessageBoxButtons.OK, MessageBoxIcon.Error)
End Try
End Sub
First I get my data by calling Get_Data(), Next I bind my data be calling
BindFields()

I get the following error when I hit these statements. cbUtility = combo
box = System.Windows.Forms.ComboBox
cbUtility.DataSource = dsDataSet.Tables("Utility")
cbUtility.DisplayMember = "UTILITY"

Error:
"Microsoft.VisualBasic - Cast from type 'DataRowView' to type 'String' is
not valid"

Another odd thing is when the exception is raised my "Catch" doesn't pick it
up! I get an error message on those lines and the program keeps going?
Also everything works correctly, all controls are bound correctly, including
that combo box.

THanks,

[mike]

Hi

Where is your table declaration

i.e. Dim ttable As New DataTable("Utility")

It may think "Utility" is a string without that
declaration.

-----Original Message-----
Hello everyone,

I'm getting a strange error when I try to bind a combo box to a Dataset.Here's my code!

Private Sub Get_Data()
Try
Dim sqlcmd = New SqlCommand("Select * from Utility order byUtility", sqlConn)

daDataAdapter = New SqlDataAdapter
daDataAdapter.SelectCommand = sqlcmd

dsDataSet = New Dataset
daDataAdapter.Fill(dsDataSet, "Utility")
sqlcmd = New SqlCommand("Select * from Adjustments", sqlConn) daDataAdapter = New SqlDataAdapter
daDataAdapter.SelectCommand = sqlcmd

daDataAdapter.Fill(dsDataSet, "Adjustments")

daRel = New DataRelation("UtilAdjust",
dsDataSet.Tables("Utility").Columns("Code"),
dsDataSet.Tables("Adjustments").Columns("Code") )
dsDataSet.Relations.Add(daRel)

Set_Update_Command()
Set_Insert_Command()
Set_Delete_Command()

Catch ex As Exception
MessageBox.Show(ex.Source.ToString & " - " & ex.Message,Application.ProductName, _
MessageBoxButtons.OK, MessageBoxIcon.Error)
End Try

End Sub

Private Sub BindFields()
Try
Dim ctrl As Control
For Each ctrl In Me.Controls
If TypeOf ctrl Is TextBox Then
ctrl.DataBindings.Clear()
ctrl.Text = ""
End If
Next

cbUtility.DataBindings.Clear()
cbType.DataBindings.Clear()

For Each ctrl In Me.GroupBox1.Controls
If TypeOf ctrl Is TextBox Then
ctrl.DataBindings.Clear()
ctrl.Text = ""
End If
Next

cbUtility.DataSource = dsDataSet.Tables ("Utility") cbUtility.DisplayMember = "UTILITY"
cbUtility.ValueMember = "CODE"

tbAN.DataBindings.Add("Text", dsDataSet,
"Utility.UtilAdjust.AdjustmentName")
lblAK.DataBindings.Clear()
lblAK.DataBindings.Add("Text", dsDataSet,
"Utility.UtilAdjust.AdjKey")

BindDate (tbASD, "UTILITY.UtilAdjust.AdjStartDate") BindDate (tbAED, "UTILITY.UtilAdjust.AdjEndDate")
BindCurr (tbAA, "UTILITY.UtilAdjust.adjustment")
BindType(cbType, "UTILITY.UtilAdjust.type")

bmUtil = Me.BindingContext (dsDataSet, "Utility") bmAdjust = Me.BindingContext (dsDataSet, "UTILITY.UtilAdjust")
AddHandler Me.BindingContext(dsDataSet,
"Utility").PositionChanged, _
AddressOf dtUtil_PositionChanged

Catch ex As Exception
MessageBox.Show(ex.Source.ToString & " - " & ex.Message,Application.ProductName, _
MessageBoxButtons.OK, MessageBoxIcon.Error)
End Try
End Sub
First I get my data by calling Get_Data(), Next I bind my data be callingBindFields()

I get the following error when I hit these statements. cbUtility = combobox = System.Windows.Forms.ComboBox
cbUtility.DataSource = dsDataSet.Tables("Utility")
cbUtility.DisplayMember = "UTILITY"

Error:
"Microsoft.VisualBasic - Cast from type 'DataRowView' to type 'String' isnot valid"

Another odd thing is when the exception is raised my "Catch" doesn't pick itup! I get an error message on those lines and the program keeps going?Also everything works correctly, all controls are bound correctly, includingthat combo box.

THanks,
.

[Ken Powers]

Mike,

I'm just using the dataset to bind the combo to

Dim sqlcmd = New SqlCommand("Select * from Utility order by
Utility", sqlConn)

daDataAdapter = New SqlDataAdapter
daDataAdapter.SelectCommand = sqlcmd

dsDataSet = New Dataset
daDataAdapter.Fill(dsDataSet, "Utility")

cbUtility.DataSource = dsDataSet.Tables("Utility")
cbUtility.DisplayMember = "UTILITY"
cbUtility.ValueMember = "CODE"