Validating textbox in c
Custom Validation We can also make an Ajax call and check some condition depending on our needs.In the following example I am checking whether the email id is available or not.Adobe provided a lot of infrastructure to do that with just a simple script.Let’s take a look at how to do that with a text field that is only supposed to have a value of either ‘AAAA’ or ‘BBBB’ (yes, I know that this does not make much sense in a real PDF form).In general the entire error message should display in the Red color.If we want to do the same we need to add some CSS for that.Required field validation is one of the most commonly used validations with web forms Now I will explain how we make an ASP. Text Box: For making a Text Box required we must use the following code. We can also use the Id of the control as a control name. If we did not add our custom message to the preceding control then it will display “This field is required.”.That creates confusion for the end user so it is always recommended that use your custom validation error message when validating a control.
To start, we create a text field and bring up the properties dialog for the field.The preceding method will check for email id availability in the database and if it is available then it will return false otherwise true.