[مساعدة]

السلام عليكم

جرب هذا التعديل

كود :

Private items() As String

Private Sub Form1_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load
    items = (From x As String In ListBox1.Items).ToArray
End Sub

Private Sub TextBox1_TextChanged(ByVal sender As Object, ByVal e As EventArgs) Handles TextBox1.TextChanged
    Me.ListBox1.Items.Clear()
    Dim txt As String = Me.TextBox1.Text.Trim.ToLower
    If TextBox1.Text.Trim = "" Then
        Me.ListBox1.Items.AddRange(items)
    Else
        Dim q = (From x As String In items Where x.ToLower.StartsWith(txt)).ToArray
        Me.ListBox1.Items.AddRange(q)
    End If
End Sub