=iif(RowNumber(Nothing) mod 2, "Beige", "WhiteSmoke")
by using this code in expression the color of the row changed 1st row "Beige" and 2nd row "WhiteSmoke"
The above expression is used for the Currency Format
=IIF(Fields!Contractual_StartDate.Value IS Nothing, "" ,FormatDateTime(Fields!Contractual_StartDate.Value,2))
The above expression is used if StartDate is nothing then display blank space i not then display the date.