# OneAndOnlyOne Property

## Overloads

| [OneAndOnlyOne](https://help.qlik.com/en-US/sense-developer/May2026/Subsystems/NetSDKAPIref/Content/Qlik.Engine.IBookmarkFieldItem.OneAndOnlyOne.htm#Qlik_Engine_IBookmarkFieldItem_OneAndOnlyOne) |  | If set to true, the field has always one selection (not 0 and not more than 1). If another value is selected, the previous one is unselected.<br><br>The default value is false. This parameter is not returned if set to false.<br><br>JSON property name: qOneAndOnlyOne |
| --- | --- | --- |

[](https://help.qlik.com/en-US/sense-developer/Subsystems/NetSDKAPIref/Content/Qlik.Engine.IBookmarkFieldItem.OneAndOnlyOne.htm) [](https://help.qlik.com/en-US/sense-developer/Subsystems/NetSDKAPIref/Content/Qlik.Engine.IBookmarkFieldItem.OneAndOnlyOne.htm)

## OneAndOnlyOne

If set to true, the field has always one selection (not 0 and not more than 1). If another value is selected, the previous one is unselected.

The default value is false. This parameter is not returned if set to false.

JSON property name: qOneAndOnlyOne

### Declaration

```

          bool OneAndOnlyOne { get; set; }
    
  
```

### Property Value

| Type | Description |
| --- | --- |
| System.Boolean |  |