' operation on System.DateTime and System.Double" when applying a filter on DataView. ">

Cannot perform '>' operation on System.DateTime and System.Double

When you apply DataView1.RowFilter = "DateColumnName > " + DateValue, you get this error:
Cannot perform '>' operation on System.DateTime and System.Double

To use a Date value in a filter, you must use a pound "#" symbol around the date value like in the following:

dsView.RowFilter = "DateColumnName >= #" + DateTime.Today + "#";