Hello Gary,

You can format the value of the summary row using the formatstring property like below:

 <ig:SummaryRow FormatString="{0} = {1:##,#.00}">    

           <ColumnSummaries>     

   <ig:ColumnSummaryInfo ColumnKey="UnitPrice">   

      <Summaries>   

 <ig:Summary SummaryType="Sum" /> 

    </Summaries>  

 </ig:ColumnSummaryInfo>   

 </ColumnSummaries>

                            </ig:SummaryRow>

Please let me know if you have any further questions regarding this matter.