Trend LIne for Line Chart in SSRS 2005

Hi All

    myself is karthi and i m new to SSRS.i need the Trend line for the follwing data in Line chart they are the follwing data.The following are the graph are my output and i need the trend line for these Key_gap value.This is the link I was refereed http://ericung.blogspot.in/2011/07/ssrs-2005-bar-chart-adding-linear-trend.html I need the same trend line for the Bar-Chart in SSRS 2005.

Waiting for yours reply

Thanks in Advance