MyForm.razor

<EditForm method="post" Model="CustomerInvite" OnValidSubmit="InviteCustomer" class="col-md-4" FormName="Invite">
    <DataAnnotationsValidator />
    <ValidationSummary/>
    
        <div class="mb-2">
            <label for="firstName" class="form-label">First Name:</label>
            <ValidationMessage For="() => CustomerInvite.FirstName" />
            <InputText id="firstName" class="form-control" @bind-Value="CustomerInvite.FirstName" />
        </div>
        <div class="mb-2">
            <label for="firstName" class="form-label">Email:</label>
            <InputText id="firstName" class="form-control" @bind-Value="CustomerInvite.Email" />
        </div>
     
    <InputCheckbox @bind-Value="CustomerInvite.IsSwitchButtonPressed" ></InputCheckbox>
  
    @if (CustomerInvite.IsSwitchButtonPressed)
    {
        <div>show something</div>
    }

    @if (Step=="2" && CustomerInvite.Mail1 != null)
    {
        <div class="mb-2">
            <MyMail @bind-Value="CustomerInvite.Mail1" />
        </div>
    }
    
    <div class="mb-2">
        <button type="submit" class="btn btn-primary">Invite</button>
    </div>
   
</EditForm>
@if (customerInvited)
{
    <div>
        <span>Customer Invited - Ask them to check their inbox to complete the signup process.</span>
    </div>
}

@if (!string.IsNullOrEmpty(Message))
{
    <div>
        <span>@Message</span>
    </div>
}

<form class="search">
    <input name="query" placeholder="Search..." value="@Step" />
    <button title="Search" class="ms-Icon ms-Icon--Search"></button>
</form>

@code {

    [Inject]
    public NavigationManager NavigationManager { get; set; }



    [SupplyParameterFromForm]
    public CustomerInvite CustomerInvite { get; set; } = new();

    [SupplyParameterFromQuery]
    public string Step { get; set; }
    public string? Message { get; set; }
   

    bool customerInvited = false;
   

    protected override void OnInitialized()
    {
        base.OnInitialized();

    }

    private void InviteCustomer()
    {
        if (Step=="2")
        { 
            Console.WriteLine("Inviting Customer: " + CustomerInvite.Email);
            customerInvited = true;
            Message = $"{CustomerInvite.Email}-{CustomerInvite.Mail1.Address}";

        }
        else
        {
            CustomerInvite.Mail1 = new Mail();
            Step = "2";
            // var uri = new UriBuilder(NavigationManager.Uri)
            // {
            //         Query = $"Step={Step}"
            // };
            // NavigationManager.NavigateTo(uri.ToString(), forceLoad: true);
        }
       
    }

   
}