How to Bind value back to the Datasource

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WPF

How to bind a UserControl Field value to the property of a View Model.

I have a AutoCompleteComboBox, which is binded to IEnumerable<string>. Now the Text which is entered in the AutoCompleteTextBox should be binded to the property of a ViewModel. But it is assigning null value.

Below is the code:

AutoCompleteComboBox.xaml file has below code:

<UserControl x:Class="EET.UI.Controls.UserControls.AutoCompleteComboBox"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:contro="clr-namespace=EET.MDM.UI.Modules"
   Panel.ZIndex="10">
    <Canvas>
        <TextBox x:Name="autoTextBox"
                 Height="25" MinWidth="150"
                 Margin="0,0,10,0" TextWrapping="NoWrap" >

        </TextBox>
        <ListBox x:Name="suggestionListBox"
                 SelectionChanged="suggestionListBox_SelectionChanged"
                 Background="LightYellow"
                 Visibility="Collapsed"
                 MinWidth="150"
                 Margin="0,25,0,-25"/>

MyTestPage.xaml file has below code which uses above AutoCompleteComboBox.xaml usercontrol:

<controls:autocompletecombobox datacontext="{Binding StrParentCounterParties}" x:name="acControl" width="200" grid.row="0" grid.column="1" margin="3" horizontalalignment="Left" xmlns:x="#unknown" xmlns:controls="#unknown">

               </controls:autocompletecombobox>

Here "StrParentCounterParties" is IEnumerable<string> collection.