@page "/" @using Microsoft.Extensions.Logging @inject ILogger<Index> Logger @using System.ComponentModel.DataAnnotations <EditForm Model="@exampleModel" OnValidSubmit="@HandleValidSubmit"> <DataAnnotationsValidator /> <ValidationSummary /> <p> <label> From Date: <InputDate @bind-Value="exampleModel.FromDate" /> </label> <ValidationMessage For="() => exampleModel.FromDate" /> </p> <p> <label> To Date: <InputDate @bind-Value="exampleModel.ToDate" /> </label> <ValidationMessage For="() => exampleModel.ToDate" /> </p> <button type="submit">Submit</button> </EditForm> @code { private ExampleModel exampleModel = new ExampleModel(); private void HandleValidSubmit() { Logger.LogInformation("HandleValidSubmit called"); // Process the valid form } public class ExampleModel : IValidatableObject { [DataType(DataType.Date)] public DateTime? FromDate { get; set; } [DataType(DataType.Date)] public DateTime? ToDate { get; set; } public IEnumerable<ValidationResult> Validate(ValidationContext validationContext) { if (ToDate < FromDate) { yield return new ValidationResult("ToDate must be after FromDate", new[] { nameof(ToDate) }); } } } }