How can I get a C # textbox autocomplete to make suggestions based on additions rather than starting with?

I have a textbox in my C # Windows Forms application that has AutoCompleteMode set to AutoCompleteMode.Suggest and my content source is a custom source.

My content source is customizable with the following values:

• Jim smith
• Alice Walker
• Bob walker
• Jeremy Smith

Only content completion is performed, checking to see if the suggested items will "start with" the value in the text box.

For example:

text=J

      

        
        
        
      

    

As a result, suggestions will appear:

• Jim smith
• Jeremy Smith

However, if the user enters

text=Walk

      

        
        
        
      

    

No results.

How can I get content completion to suggest the following?

• Alice Walker
• Bob walker

Also, my end goal is to have a text box where people can start typing email addresses easily. The content of the autocomplete suggestions will include names + email addresses. For example:

- Jim Smith <jsmith@mycorp.com>
- Alice Walker <alice@some.email.com>
- Bob Walker <bob.walker@mycorp.com>
- Jeremy Smith <jeremys@foo.com>