Avoiding the Simultaneaous Button Clicks

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Silverlight

Hi,

In my application i have Search button for Search Order. When i enter the Order no and order type and click submit button then it shows the documents for that order no.But,The Problem with the application is when i click the Search button simultaneously it replicates the data.I want to avoid the replication of the data on multiple button click.

Thanks,
Umesh Tayade

<Button Content="Search"  Margin="5,0,0,0" Height="21" Width="100" Grid.Row="0" Grid.Column="9" HorizontalAlignment="Left" VerticalAlignment="Center" Style="{StaticResource grayButton}" x:Name="btnSearch" Click="btnSearch_Click"/> 

private void btnSearch_Click(object sender, RoutedEventArgs e)
{
   if (IsValid() && isLineValid)
   {
      if (null != multiDocViewModelConnector.ViewState && multiDocViewModelConnector.ViewState.FilterDescripter != null)
                    multiDocViewModelConnector.ViewState.FilterDescripter.Clear();
      __searchCriteria();
   }
  }