Form validation example

validation.html

            <form asp-action="AddNewRole" asp-controller="Admin">
                <div asp-validation-summary="ValidationSummary.ModelOnly"></div>
                <div class="color-line"></div>
                <div class="modal-header">
                    <h4 class="modal-title">Add new role</h4>
                    <small class="font-bold"></small>
                </div>
                <div class="modal-body">
                    <div class="panel-body">
                        <div class="form-group">
                            <label class="col-sm-2 control-label">Code</label> 
                            <div class="col-sm-5">
                                <input asp-for="Role.Code" type="text" id="inputCode" name="Role.Code" class="form-control">
                                <span asp-validation-for="Role.Code" class="text-danger"></span>
                            </div>
                        </div>
                        <br />
                        <div class="hr-line-dashed"></div>
                        <div class="form-group">
                            <label class="col-sm-2 control-label">Description</label> 
                            <div class="col-sm-10">
                                <textarea asp-for="Role.Description" id="textAreaDescription" name="Role.Description" class="form-control" style="resize:none"></textarea>
                                <span asp-validation-for="Role.Description" class="text-danger"></span>
                            </div>
                        </div>
                    </div>
                </div>
                <div class="modal-footer">
                    <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
                    <button type="submit" class="btn btn-primary">Save</button>
                </div>
            </form>