The following C# - Crystal Reports section describes how to add a summary field in the Crystal Reports
In the Crystal Reports designer view window, right click on the Report Footer , just below the Total field and select Insert -> Summary .
Then you will get a screen , select the Total from the combo box and select Sum from next Combo Box , and summary location Grand Total (Report Footer) . Click Ok button
Now you can see @Total is just below the Total field in the report Footer
Now the designing part is over and the next step is to call the Crystal Reports in C# and view it in Crystal Reports Viewer control .
Select the default form (Form1.cs) you created in C# and drag a button and a CrystalReportViewer control to your form .
You have to include CrystalDecisions.CrystalReports.Engine in your C# Source Code.