How to validate textbox when radio-button is selected?

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jQuery

HTML5

bootstrap

Hi Team

I want to find out how to validate Textbox, when a radio button is selected in asp.net mvc. I have this controls on the View side, need some help around jquery side. Because it must first validate when a user uses incorrect email address, once correct email is used there wont be any error message to the textbox.

What I have tried:

<div class="modal-body">
                                    <label for="Text" class="col-sm-2 col-form-label">Add users by</label>
                                    <div class="form-group row">
                                        <div class="col-sm-4">
                                            <input type="radio" id="EmailAddress" name="choose" />
                                            <label for="EmailAddress" class="col-form-label">EmailAddress</label>
                                        </div>
                                        <div class="col-sm-3">
                                            <input type="radio" id="LoginID" name="choose" />
                                            <label for="LoginID" class="col-form-label">LoginID</label>
                                        </div>

                                        <div class="col-sm-3">
                                            <input type="radio" id="SIS_ID" name="choose" />
                                            <label for="SIS_ID" class="col-form-label">SIS_ID</label>
                                        </div>

                                        <div class="col-sm-12">
                                            @Html.TextAreaFor(m => m.eNtsaAdmin.eNtsaTextAreaDisc, new { @class = "form-control", style = "font-size: medium; font-weight: bold; width:450px", id = "eNtsaTextAreaDisc" })

                                        </div>
                                        <hr />


                                    </div>