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  Tutorial: ASP.NET .NET Validate using RequiredFieldValidator Tutorial

In this tutorial you'll find out how to validate a TextBox and RadioButtonList control on a webform using RequiredFieldValidator, which will show a warning and stop the submission of the form if a required field has no value.

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Validate using RequiredFieldValidator

In this tutorial you'll find out how to validate a TextBox and RadioButtonList control on a webform using RequiredFieldValidator, which will show a warning and stop the submission of the form if a required field has no value. Content:
In this tutorial you'll find out how to validate a control on a webform using RequiredFieldValidator . Using this you can show a warning and stop the submission of the form if a required field has no value.

Start a new ASP .NET Web Application project in Visual Studio .NET, named formValidation .

Add a new TextBox , a Button and RequiredFieldValidator :
The RequiredFieldValidator validates a field to see if a control has a value or not. In our example we use it to check if the box is empty or not.

We choose which control we need to check by changing the ControlToValidate property to the name of our TextBox control - TextBox1.


 

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