TextBox Bound to ComboBox Text property when SelectedIndex = -1

[WantsToLearn]

TextBox bound to a CombBox Text property similar to this:

TextBox1.DataBinding.Add("Text", ComboBox1, "Text")

If the ComboBox SelectedIndex is -1

1. Do I have to manually set TextBox1.Text property = ""
2. If I do that, does it impact the DataBinding in any way

 

[chrissie1]

1. depends on what you mean, do you mean you set selectedindex to -1 via code or is the field you bound empty?
2. yes, but I would recommend changing the dataset.

Don't forget the selectedvalue property when you want to set a combobox to empty.

Christiaan Baes
Belgium

If you want to get an answer read this FAQ faq796-2540
There's no such thing as a winnable war - Sting

 

[WantsToLearn]

Sorry I wasn't more precise in my first post. From my VB6 days, you could set in code the SelectedIndex to -1 so the ComboBox didn't initially display anything.

On my form I have a Button, 2 TextBoxes and a ComboBox which I filled from Northwind. The code below works

Form Load code
    ... pulled some code out to condense
    Me.ComboBox1.DataSource = mDataSet.Tables("Customers")
    mDataTable = CType(Me.ComboBox1.DataSource, DataTable)
    Me.ComboBox1.ValueMember = "CustomerID"
    Me.ComboBox1.DisplayMember = "CompanyName"
    Me.TextBox1.DataBindings.Add("Text", ComboBox1, "Text")
    Me.TextBox2.DataBindings.Add("Text", ComboBox1, "SelectedValue")
End Sub

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
    mDataTable.DefaultView.RowFilter = "False"
    Me.TextBox2.Text = Nothing
End Sub

Private Sub ComboBox1_GotFocus(ByVal sender As Object, ByVal e As System.EventArgs) Handles ComboBox1.GotFocus
    mDataTable.DefaultView.RowFilter = Nothing
End Sub

I just wondered if there was a better way. Thanks!