Find the value of control inside the datatemplate of datagrid in silverlight

Question

Hi,

i am having one datagrid . i am binding data to that grid. in that grid i am having one column in that column i took one hyperlinkbutton called TakeExam in datatemplate. i am having employeeid column in that datagrid. now when i click on hyperlink i have to get the employee id of perticular row . i am sending my source code and xaml.cs file too.can anybody help me



<sdk:DataGrid Grid.Row="2" Grid.Column="1" x:Name="Grd_AssessmentDetails" VerticalAlignment="Center" LoadingRow="Grd_AssessmentDetails_LoadingRow"  SelectedItem="{Binding SelectedItem, Mode=OneWay}"  RowDetailsVisibilityMode="VisibleWhenSelected" SelectionMode="Single" AutoGenerateColumns="False" HorizontalContentAlignment="Center"  HorizontalGridLinesBrush="Goldenrod" HorizontalAlignment="Center" VerticalScrollBarVisibility="Disabled"  SelectionChanged="dgQPGallery_SelectionChanged" Grid.ColumnSpan="4"  Width="900">
 
  <sdk:DataGrid.Resources>
  <Style TargetType="sdk:DataGridColumnHeader">
  <Setter Property="HorizontalContentAlignment" Value="Center"/> 
  <Setter Property="FontSize" Value="10"/>
  <Setter Property="ContentTemplate">
  <Setter.Value>
  <DataTemplate>
  <TextBlock Text="{Binding}" TextWrapping="Wrap" MinWidth="50"/>
  </DataTemplate>
  </Setter.Value>
  </Setter>
  </Style>
 
  </sdk:DataGrid.Resources>

 
  <sdk:DataGrid.Columns>
  <sdk:DataGridTemplateColumn Header="SNo"  Width="45">
  <sdk:DataGridTemplateColumn.CellTemplate>
  <DataTemplate x:Name="SNo">
  <TextBlock x:Name="tbID"></TextBlock>
  </DataTemplate>
  </sdk:DataGridTemplateColumn.CellTemplate>
  </sdk:DataGridTemplateColumn>

  <sdk:DataGridTemplateColumn Header="AllotedExamID"  Width="45" Visibility="Collapsed">
  <sdk:DataGridTemplateColumn.CellTemplate>
  <DataTemplate x:Name="AllotedExamid">
  <sdk:Label x:Name="lbl_AllotedExamid" Content="{Binding AllotedExamID,Mode=TwoWay}"></sdk:Label>
  </DataTemplate>
  </sdk:DataGridTemplateColumn.CellTemplate>
  </sdk:DataGridTemplateColumn>

  <sdk:DataGridTextColumn Header="TYPE" Width="80"  Binding="{Binding ExamType}"/>
 
  <sdk:DataGridTextColumn Header="CODE" Width="55" Binding="{Binding QPCodeString}"/>
  <sdk:DataGridTextColumn Header="TITLE" Width="80"  Binding="{Binding QPTitle}"/>
  <sdk:DataGridTextColumn Header="QUESTIONS" Width="55"  Binding="{Binding Total_Questions}"/>
  <sdk:DataGridTextColumn Header="DURATION" Width="55"  Binding="{Binding Total_Time}"/>
  <sdk:DataGridTextColumn Header="START DATE" Width="80"  Binding="{Binding FromDate}"/>
  <sdk:DataGridTextColumn Header="END DATE" Width="80"  Binding="{Binding ToDate}" />
  <sdk:DataGridTextColumn Header="START TIME" Width="55"  Binding="{Binding FromTime}" />
  <sdk:DataGridTextColumn Header="END TIME" Width="55"  Binding="{Binding ToTime}"/>
  <sdk:DataGridTextColumn Header="ASSAIGNED ON" Width="80"  Binding="{Binding PostedDate}"/>
  <sdk:DataGridTextColumn Header="BY" Width="55"  Binding="{Binding EmployeeName}"/>
  <sdk:DataGridTextColumn Header="STATUS" Width="60" Binding="{Binding Status}"/>
  <sdk:DataGridTemplateColumn Header="EXAM" Width="55" >
  <sdk:DataGridTemplateColumn.CellTemplate>
  <DataTemplate x:Name="EXAM">
  <HyperlinkButton Content="TakeExam" x:Name="Hpl_TakeExam" Click="Hpl_TakeExam_Click"  />
  <!--<TextBlock x:Name="tbID"></TextBlock>-->
  </DataTemplate>
  </sdk:DataGridTemplateColumn.CellTemplate>
  </sdk:DataGridTemplateColumn>
  <!--<sdk:DataGridTextColumn Header="EXAM" Width="100" Binding="{Binding QPStatus}" />-->
  </sdk:DataGrid.Columns>
  </sdk:DataGrid>




 private void Hpl_TakeExam_Click(object sender, RoutedEventArgs e)
  {
 
  foreach (Assessment assesment in Grd_AssessmentDetails.ItemsSource)
  {
 
  FrameworkElement ele = Grd_AssessmentDetails.Columns[columnindex].GetCellContent(assesment);
  Label allotedexamid = ele.FindName("lbl_AllotedExamid") as Label;
  allotedexamid.Content = assesment.AllotedExamID;
}



Thanks
P.Nagaraju.