# OneAndOnlyOne Property

## Overloads

| [OneAndOnlyOne](https://help.qlik.com/en-US/sense-developer/November2025/Subsystems/NetSDKAPIref/Content/Qlik.Engine.INxCurrentSelectionItem.OneAndOnlyOne.htm#Qlik_Engine_INxCurrentSelectionItem_OneAndOnlyOne) |  | This parameter is displayed if its value is true.<br><br>Property that is set to a field. Is set to true if the field cannot be unselected.<br><br>This parameter is optional.<br><br>JSON property name: qOneAndOnlyOne |
| --- | --- | --- |

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

## OneAndOnlyOne

This parameter is displayed if its value is true.

Property that is set to a field. Is set to true if the field cannot be unselected.

This parameter is optional.

JSON property name: qOneAndOnlyOne

### Declaration

```

          bool OneAndOnlyOne { get; set; }
    
  
```

### Property Value

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