Visibility based on Parameter selection in SSRS

Add a function called "IsColumnSelected" that accepts the multi-value parameter and a column name and returns a boolean value:
''' <summary>
''' Return whether the passed column name has been selected
''' in the multi-value parameter, whether it should be visible
''' or not.
''' </summary>

Public Shared Function IsColumnSelected(ByRef objMultiValueParam() As Object, ByVal strColumnName As String) As Boolean
    ' return whether the passed column name is in the multi-value
    ' parameter array
    Return 0 < InStr(vbNullChar & Join(objMultiValueParam, vbNullChar) & _
        vbNullChar, vbNullChar & strColumnName & vbNullChar)
End Function

using an expression that needs to be put in each column's "Visibility" property which calls "IsColumnSelected". Put the expression below in the "Visibility" property of the first column:

=Not Code.IsColumnSelected(Parameters!ColumnsToDisplay.Value, "Column1")