Use the Required Field Validator control to make the field required.
are used when we need to make multiple sets of choices available, but we want the user to select only one of them.
If they click on a second selection after making a first, the first selection is replaced by the second.
That force to choose Radio Button control before going father task.
Means here Custom Validator is used as Required Field Validator.
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The Regular Expression Validator control is used to ensure that an input value matches a specified pattern.
The validation will not fail if the input control is empty.