Question

I have a dynamic datatable, created from a database. I want to add a new row (blank), so there is an option to choose nothing in a combobx. Everything works ok without adding the new row. But when I add a new row, the combobox displays nothing. What am I missing?

Here is the code

Dim DT As New DataTable

DT = DS.Tables("CallStatus")
Dim drNewRow As DataRow = DT.NewRow

'Add new row
drNewRow.Item("CampaignCallStatusID") = ""
drNewRow.Item("CampaignCallStatus") = ""
DT.Rows.Add(drNewRow)
DT.AcceptChanges()

'Fill combobox
With cboCallStatus
    .DataSource = DT
    .DisplayMember = "CampaignCallStatus"
    .ValueMember = "CampaignCallStatusID"
End With

Answer 1

I found a solution. I used the method InsertAt, and plased the row in the top.

 Dim DT As New DataTable
 DT = DS.Tables("CallStatus")
 Dim drNewRow As DataRow = DT.NewRow
 DT.Rows.InsertAt(drNewRow, 0)   ' <== This is the solution
 DT.AcceptChanges()

 With cboCallStatus
    .DataSource = DT
    .DisplayMember = "CampaignCallStatus"
    .ValueMember = "CampaignCallStatusID"
 End With
 cboCallStatus.Refresh()