title: searching middle of string with autocomplete textbox
body: <p>I have a textbox with a database table as an autocomplete source, I am filling the autocomplete string collection with the code below, it's working fine and suggestions are appearing as i type but this only suggests string which starts with what i'm typing, how can I get it to suggest strings that contains what i type. </p>
  
  <p>Example, if I had a list of colors on my autocomplete and I type 'o' it would suggest colors like '<strong>o</strong>range' but also 'vi<strong>o</strong>let'</p>
  
  <pre><code>oracmd = New OracleCommand("Select column_name from table", oracon)
  Dim ds As New DataSet
  orada = New OracleDataAdapter(oracmd)
  orada.Fill(ds, "list")
  Dim col As New AutoCompleteStringCollection
  Dim i As Integer
  For i = 0 To ds.Tables(0).Rows.Count - 1
       col.Add(ds.Tables(0).Rows(i)("column_name").ToString())
  Next
  TextBox1.AutoCompleteSource = AutoCompleteSource.CustomSource
  TextBox1.AutoCompleteCustomSource = col
  TextBox1.AutoCompleteMode = AutoCompleteMode.Suggest
  </code></pre>