Combobox issue

[Antonio Paglia]

Hi people,

Dim rows as string = "item1;item2;item3....."
Combo.DropDownStyle = ComboBoxStyle.DropDownList
Combo.DataSource = rows.Split(";"c)
Combo.SelectedIndex = -1

The combo is placed inside an MDI Child form. When the form is showed, the
combobox allways apears with the first item selected.
What is wrong ???

Please, help me !!

TIA

 

[Guest]

I guess u gotta have a blank item at the start and then bind the control

[C#]
string rows = ";item1;item2;item3";
Combo.DataSource = rows.Split(';');
Combo.SelectedIndex = 1;
Combo.DataBind();

 

[Antonio Paglia]

Unfortunately no.

I have noticed that adding items with

combo.items.Add "item1"
combo.items.Add "item2"

works fine

But whem I use DataTable or an Array as datasource don't work

If use DataTable I allways set

Combo.DisplayMember = dt.Columns(1).ColumnName
Combo.ValueMember = dt.Columns(0).ColumnName

 

[Cor Ligthert [MVP]]

Antonio,

There is a combobox bug, that can be workaround with setting the
selectedindex two times to -1. Can you try if that solves your problem.

I hope this helps,

Cor

 

[Antonio Paglia]

I have tried but nothing....

If you want to see this issue, try this:

- Add new form1 and form2
- In form1 place a button and copy

Me.IsMdiContainer = True

LoadData() -------> load data into a dataset ds ( or
DataTable)

Dim dtNewTable As DataTable = ds.Tables(0)
dtNewTable.TableName = "Menu"
ds.Tables.Add(dtNewTable)

Dim f As New Form1
f.anyMethod(dsProducts)

f.MdiParent = Me
f.Show()


- In form2

Public Sub anyMethod(ByVal ds As DataSet)

cboDemo.DropDownStyle = ComboBoxStyle.DropDownList
cboDemo.DataSource = ds.Tables("Menu")
cboDemo.DisplayMember = "ProductName"
cboDemo.ValueMember = "ProductID"
cboDemo.SelectedIndex = -1
cboDemo.SelectedIndex = -1

End Sub

 

[Cor Ligthert [MVP]]

Antonio,

Dim dtNewTable As DataTable = ds.Tables(0)
dtNewTable.TableName = "Menu"
ds.Tables.Add(dtNewTable)

Beside all what you are doing, will this in my opinion never go. You tell
that dtNewTable is an old table with a new name.

If you want a new table than you have to do.

Dim DtNewTable as DataTable = ds.Table(0).Copy

http://msdn.microsoft.com/library/d...ml/frlrfsystemdatadatatableclasscopytopic.asp

I hope this helps,

Cor