Best way to trim value in textbox before save/insert using formview into datasource

asp.net, c#, formview, trim

Solution

formView.Controls
    .OfType<System.Web.UI.WebControls.TextBox>()
    .ToList()
    .ForEach(t => t.Text = t.Text.Trim());

Problem

By triming i mean something like. First name "John " -> trim to "John" Last name "Lennon " -> trim to "Lennon" I have those Textbox in FormView, binding with property using Bind("FirstName"). The FormView bind with Entity Datasource. I want those value to be trim before saving, what is the best way to do this ?

Original source