This expression can be used to control the visibility property of field/row/group in your report.
=IIF(IsNothing(Fields!Test.Value),True,False)
To use in the matrix, right click row then click Row Visibility, select "Show or hide based on a expression. Enter expression.
=IIF(IsNothing(Fields!Test.Value),True,False)
To use in the matrix, right click row then click Row Visibility, select "Show or hide based on a expression. Enter expression.