# CheckNumberOrExpressionAsync Method

## Overloads

| [CheckNumberOrExpressionAsync(String)](https://help.qlik.com/en-US/sense-developer/May2026/Subsystems/NetSDKAPIref/Content/Qlik.Engine.App.CheckNumberOrExpressionAsync.htm#Qlik_Engine_App_CheckNumberOrExpressionAsync_System_String_) |  | Checks if:<br><br>\* A given expression is valid.<br><br>\* A number is correct according to the locale. |
| --- | --- | --- |
| [CheckNumberOrExpressionAsync(AsyncHandle, String)](https://help.qlik.com/en-US/sense-developer/May2026/Subsystems/NetSDKAPIref/Content/Qlik.Engine.App.CheckNumberOrExpressionAsync.htm#Qlik_Engine_App_CheckNumberOrExpressionAsync_Qlik_Engine_AsyncHandle_System_String_) |  | Checks if:<br><br>\* A given expression is valid.<br><br>\* A number is correct according to the locale. |
| [CheckNumberOrExpressionAsync<T>(AsyncHandle, Func<Response, T>, String)](https://help.qlik.com/en-US/sense-developer/May2026/Subsystems/NetSDKAPIref/Content/Qlik.Engine.App.CheckNumberOrExpressionAsync.htm#Qlik_Engine_App_CheckNumberOrExpressionAsync__1_Qlik_Engine_AsyncHandle_System_Func_Qlik_Engine_Communication_IO_Response___0__System_String_) |  | Checks if:<br><br>\* A given expression is valid.<br><br>\* A number is correct according to the locale. |

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

## CheckNumberOrExpressionAsync(String)

Checks if:

* A given expression is valid.
* A number is correct according to the locale.

### Declaration

```

          public Task<CheckNumberOrExpressionResult> CheckNumberOrExpressionAsync([QixName("qExpr")] string expr)
    
  
```

### Parameters

| Type | Name | Description |
| --- | --- | --- |
| System.String | expr | Expression to check. |

### Returns

| Type | Description |
| --- | --- |
| System.Threading.Tasks.Task&lt;[CheckNumberOrExpressionResult](https://help.qlik.com/en-US/sense-developer/May2026/Subsystems/NetSDKAPIref/Content/Qlik.Engine.CheckNumberOrExpressionResult.htm)&gt; |  |

### Implements

[IApp.CheckNumberOrExpressionAsync(String)](https://help.qlik.com/en-US/sense-developer/May2026/Subsystems/NetSDKAPIref/Content/Qlik.Engine.IApp.CheckNumberOrExpressionAsync.htm#Qlik_Engine_IApp_CheckNumberOrExpressionAsync_System_String_)

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

## CheckNumberOrExpressionAsync(AsyncHandle, String)

Checks if:

* A given expression is valid.
* A number is correct according to the locale.

### Declaration

```

          public Task<CheckNumberOrExpressionResult> CheckNumberOrExpressionAsync(AsyncHandle asyncHandle, [QixName("qExpr")] string expr)
    
  
```

### Parameters

| Type | Name | Description |
| --- | --- | --- |
| [AsyncHandle](https://help.qlik.com/en-US/sense-developer/May2026/Subsystems/NetSDKAPIref/Content/Qlik.Engine.AsyncHandle.htm) | asyncHandle | Handle to asynchronous method request |
| System.String | expr | Expression to check. |

### Returns

| Type | Description |
| --- | --- |
| System.Threading.Tasks.Task&lt;[CheckNumberOrExpressionResult](https://help.qlik.com/en-US/sense-developer/May2026/Subsystems/NetSDKAPIref/Content/Qlik.Engine.CheckNumberOrExpressionResult.htm)&gt; |  |

### Implements

[IApp.CheckNumberOrExpressionAsync(AsyncHandle, String)](https://help.qlik.com/en-US/sense-developer/May2026/Subsystems/NetSDKAPIref/Content/Qlik.Engine.IApp.CheckNumberOrExpressionAsync.htm#Qlik_Engine_IApp_CheckNumberOrExpressionAsync_Qlik_Engine_AsyncHandle_System_String_)

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

## CheckNumberOrExpressionAsync&lt;T&gt;(AsyncHandle, Func&lt;Response, T&gt;, String)

Checks if:

* A given expression is valid.
* A number is correct according to the locale.

### Declaration

```
public Task<T> CheckNumberOrExpressionAsync<T>(AsyncHandle asyncHandle, Func<Response, T> onResult, [QixName("qExpr")] string expr)
```

### Parameters

| Type | Name | Description |
| --- | --- | --- |
| [AsyncHandle](https://help.qlik.com/en-US/sense-developer/May2026/Subsystems/NetSDKAPIref/Content/Qlik.Engine.AsyncHandle.htm) | asyncHandle | Handle to asynchronous method request |
| System.Func&lt;[Response](https://help.qlik.com/en-US/sense-developer/May2026/Subsystems/NetSDKAPIref/Content/Qlik.Engine.Communication.IO.Response.htm), T&gt; | onResult | Continuation function |
| System.String | expr | Expression to check. |

### Returns

| Type | Description |
| --- | --- |
| System.Threading.Tasks.Task&lt;T&gt; |  |

### Type Parameters

| Name | Description |
| --- | --- |
| T |  |

### Implements

[IApp.CheckNumberOrExpressionAsync<T>(AsyncHandle, Func<Response, T>, String)](https://help.qlik.com/en-US/sense-developer/May2026/Subsystems/NetSDKAPIref/Content/Qlik.Engine.IApp.CheckNumberOrExpressionAsync.htm#Qlik_Engine_IApp_CheckNumberOrExpressionAsync__1_Qlik_Engine_AsyncHandle_System_Func_Qlik_Engine_Communication_IO_Response___0__System_String_)