You can create your own filtering method using the FilterDefinition property to save/load custom filters in code.

You can apply one of a few pre-defined filters by reading the FilterDefinition property from a xml file like the following:

To write code in Visual Basic

Private Sub ReadFilter(name As String)
       c1TrueDBGrid1.Splits(0).FilterDefinition = System.IO.File.ReadAllText(name & ".xml")
End Sub

To write code in C#

void ReadFilter(string name)
{
    c1TrueDBGrid1.Splits[0].FilterDefinition = System.IO.File.ReadAllText(name + ".xml");
}

The custom filter can then be applied to the grid and saved as custom like the following:

To write code in Visual Basic

Private Sub SaveCustomFilter()
       System.IO.File.WriteAllText("custom.xml", Me.c1TrueDBGrid1.Splits(0).FilterDefinition)
End Sub

To write code in C#

void SaveCustomFilter()
{
       System.IO.File.WriteAllText("custom.xml", this.c1TrueDBGrid1.Splits[0].FilterDefinition);
}