hi forum how to add Serial No in "Report.rdlc". I want to add SNo. in as a extra field in Report. SNo. ItemName Price 1 abc 10 2 xyz 20

I did not understand your question properly. You want the field to be coming from the database or it can be directly calculated in the report. If you want it in the report directly then you can use the function RowNumber("table") if there is a detail section. if there is no detail section and there is a group then you can use the expression RunningValue(AnyGroupField,Countdistinct,"Group1")

To add a serial number in a column in reporting service use Expression "=RowNumber(Table Name)" into your textbox & it will generate the serial number.