Binding element inside datatemplate

[Ishita]

Hi, 
      As per the requirement , i have a Gridviewcolumn in TreeListView for Icon + Text in a single cell. 
I am using data template. 

<DataTemplate x:Key="datatemplate">

         <Grid>

             <Grid.ColumnDefinitions>

                 <ColumnDefinition Width="Auto"/>

                 <ColumnDefinition Width="*"/>

             </Grid.ColumnDefinitions>

             <Image Grid.Column="0" Source="{Binding TreeList_IconImage, Converter={StaticResource ConvertStringToImge}}"/>

             <TextBlock Grid.Column="1" Name="txtText"  />

         </Grid>
</DataTemplate>
and 
 in Xaml.cs , C#

GridViewColumn templateColumn = new GridViewColumn();
                           templateColumn.CellTemplate = (DataTemplate)Resources["datatemplate"];
                           templateColumn.Header = SLColumnName[ColumnName.Key.ToString()].ToString();
                           // I want to set bindning to TextBlock inside Datatemplate.
  radTreeListView.Columns.Add(templateColumn);

 I want to set bindning to TextBlock which is inside Datatemplate. 
 I dont want to set binding in xaml page as the name of column will come from database.