AllowFirst property
Gets or sets a flag indicating whether the first item is a valid selection.
Syntax
public bool AllowFirst { get; set; }
Property Value
Type: System.Boolean
Default value: false
AllowNull property
Gets or sets a flag indicating whether it is valid to select no item.
Syntax
public bool AllowNull { get; set; }
Property Value
Type: System.Boolean
Default value: false