# RequiredValidationRule

Namespace: **Wisej.Web**

Assembly: **Wisej.Framework** (4.0.0.0)

* [ValidationRule](/api/wisej.web/extenders/validation/wisej.web.validationrule.md)
  * [RequiredValidationRule](/api/wisej.web/extenders/validation/wisej.web.requiredvalidationrule.md)

Validates controls that cannot be left empty.

{% tabs %}
{% tab title="C#" %}

```csharp
public class RequiredValidationRule : ValidationRule
```

{% endtab %}

{% tab title="VB.NET" %}

```visual-basic
Public Class RequiredValidationRule
    Inherits ValidationRule
```

{% endtab %}
{% endtabs %}

## Constructors

### ![](/files/hsR4ok3152WyAf8J2C1u) RequiredValidationRule()

Initializes a new instance of the [RequiredValidationRule](/api/wisej.web/extenders/validation/wisej.web.requiredvalidationrule.md) class.

## Properties

### ![](/files/hsR4ok3152WyAf8J2C1u) MinimumLength

[Nullable\<Int32>](https://docs.microsoft.com/dotnet/api/system.nullable-1): Returns or sets the required minimum number of characters. (Default: `null`)

### ![](/files/hsR4ok3152WyAf8J2C1u) Name

[String](https://docs.microsoft.com/dotnet/api/system.string): Returns or sets the name of the validation rule. (Default: `"Required"`)

### ![](/files/hsR4ok3152WyAf8J2C1u) Required

[Boolean](https://docs.microsoft.com/dotnet/api/system.boolean): Returns or sets whether the control can be empty or its required to have a value. (Default: `True`)

### ![](/files/hsR4ok3152WyAf8J2C1u) Trim

[Boolean](https://docs.microsoft.com/dotnet/api/system.boolean): Returns or sets whether empty controls with spaces are considered empty and fail validation. (Default: `True`)

## Methods

### ![](/files/hsR4ok3152WyAf8J2C1u) OnValidating(control)

Validates the *control* using the validation rule.

| Parameter   | Type                                         | Description |
| ----------- | -------------------------------------------- | ----------- |
| **control** | [Control](/api/wisej.web/general/control.md) |             |

**Returns:** [Boolean](https://docs.microsoft.com/dotnet/api/system.boolean). true if the validation is successful; otherwise false.


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