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c# - In mvc I have this dropdown list. How can I give a empty default value to my dropdown? this is the code i use

This is my code now, it displays all emails from my database but the begin value of my dropdown should be nothing.

            <div class="col-sm-10">
                <select asp-for="client.Email" name="client.Email" id="client.Email">
                    <br />
                    @foreach (var res in clientRepository.GetAllClients())
                    {
                        <option  [email protected]>@res.Email [email protected]</option>
                    }

                </select>
                <span asp-validation-for="client.Email" class="text-danger"></span>
            </div>
        </div>

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