In the standard Windows Phone functions like messaging or Email App, when you enter a text, you will see the list of suggestions for the text you are typing in the top of the on-screen keyboard.

Similarly, we can display the suggestions for a textbox in the on-screen keyboard in our Windows Phone App, too, with the help of Input Scope (Chat or Text InputScopeName).

Just set the InputScope of the textbox to “Text” like this:

<TextBox Name="textBox1" Text="">

<TextBox.InputScope>

<InputScope >

<InputScopeName NameValue="Text"/> </InputScope>

</TextBox.InputScope>

</TextBox>

If you want to try this in codebehind , you can use the below C# code instead

InputScope inputScope = new InputScope();
InputScopeName inputName = new InputScopeName();
inputName.NameValue = InputScopeNameValue.Text;
inputScope.Names.Add(inputName);
textBox1.InputScope = inputScope;

Run the WP7 Application and start enter few characters in the textbox , you should see the suggestions now