Public Function Add( _
   ByVal filterItem As IFilterItem _
) As Integer

Dim instance As FilterItemCollection
Dim filterItem As IFilterItem
Dim value As Integer
 
value = instance.Add(filterItem)

public int Add( 
   IFilterItem filterItem
)

FarPoint.Web.Spread.NamedStyle instyle = new FarPoint.Web.Spread.NamedStyle();  
FarPoint.Web.Spread.NamedStyle outstyle = new FarPoint.Web.Spread.NamedStyle();  
instyle.BackColor = Color.Yellow;   
outstyle.BackColor = Color.Aquamarine;  
FarPoint.Web.Spread.FilterColumnDefinition fcd = new FarPoint.Web.Spread.FilterColumnDefinition(1, FarPoint.Web.Spread.FilterListBehavior.SortByMostOccurrences
| FarPoint.Web.Spread.FilterListBehavior.Default);  
FarPoint.Web.Spread.FilterColumnDefinition fcd1 = new FarPoint.Web.Spread.FilterColumnDefinition(2);  
FarPoint.Web.Spread.FilterColumnDefinition fcd2 = new FarPoint.Web.Spread.FilterColumnDefinition();  
FarPoint.Web.Spread.StyleRowFilter sf = new FarPoint.Web.Spread.StyleRowFilter(FpSpread1.Sheets[0], instyle, outstyle); 
sf.AddColumn(fcd);  
sf.AddColumn(fcd1);  
sf.AddColumn(fcd2);   
FpSpread1.Sheets[0].RowFilter = sf;  
FarPoint.Web.Spread.FilterItemCollection fc;  
fc = fcd.Filters;  
 
foreach(FarPoint.Web.Spread.DefaultFilterItem df in fc) 
{ 
fc.Add(df); 
} 

Dim instyle As New FarPoint.Web.Spread.NamedStyle()
Dim outstyle As New FarPoint.Web.Spread.NamedStyle()
instyle.BackColor = Color.Yellow 
outstyle.BackColor = Color.Aquamarine
Dim fcd As New FarPoint.Web.Spread.FilterColumnDefinition(1, FarPoint.Web.Spread.FilterListBehavior.SortByMostOccurrences
Or FarPoint.Web.Spread.FilterListBehavior.Default)
Dim fcd1 As New FarPoint.Web.Spread.FilterColumnDefinition(2)
Dim fcd2 As New FarPoint.Web.Spread.FilterColumnDefinition()
Dim sf As New FarPoint.Web.Spread.StyleRowFilter(FpSpread1.Sheets(0), instyle, outstyle)
sf.AddColumn(fcd)
sf.AddColumn(fcd1)
sf.AddColumn(fcd2)
FpSpread1.Sheets(0).RowFilter = sf

Dim fc As FarPoint.Web.Spread.FilterItemCollection
fc = fcd.Filters
Dim df As FarPoint.Web.Spread.DefaultFilterItem
For Each df In fc
fc.Add(df)
Next