public class EditEmployeeModel 
{
    public string Email { get; set; }

    [CompareProperty("Email", 
        ErrorMessage = "Email and Confirm Email must match")]
    public string ConfirmEmail { get; set; }
}

@inject IJSRuntime JSRuntime  

@code {
  string currentInputValue;

  public async Task Save()
  {
    await JSRuntime.InvokeVoidAsync("localStorage.setItem", "name", currentInputValue);
  }

  public async Task Read()
  {
    currentInputValue = await JSRuntime.InvokeAsync<string>("localStorage.getItem", "name");
  }

  public async Task Delete()
  {
    await JSRuntime.InvokeAsync<string>("localStorage.removeItem", "name");
  }
}

@using Microsoft.AspNetCore.Components.Server.ProtectedBrowserStorage
@inject ProtectedLocalStorage BrowserStorage


@code {
  string currentInputValue;

  public async Task Save()
  {
    await BrowserStorage.SetAsync("name", currentInputValue);
  }

  public async Task Read()
  {
    var result = await BrowserStorage.GetAsync<string>("name");
    currentInputValue = result.Success ? result.Value : "";
  }

  public async Task Delete()
  {
    await BrowserStorage.DeleteAsync("name");
  }
}

@inject ProtectedSessionStorage BrowserStorage

using System.ComponentModel.DataAnnotations;

namespace CustomValidators
{
    [AttributeUsage(AttributeTargets.Field | AttributeTargets.Property | AttributeTargets.Parameter)]
    public class EmailDomainValidator : ValidationAttribute
    {
        public string AllowedDomain { get; set; }

        protected override ValidationResult IsValid(object value, 
            ValidationContext validationContext)
        {
            string[] strings = value.ToString().Split('@');
            if (strings[1].ToUpper() == AllowedDomain.ToUpper())
            {
                return null;
            }

            return new ValidationResult($"Domain must be {AllowedDomain}",
            new[] { validationContext.MemberName });
        }
    }
}

• Blazored.FluentValidation
• Blazor-Validation
• Accelist.FluentValidation.Blazor

public class Employee
{
    [Required]
    public string FirstName { get; set; }

    [Required]
    public string LastName { get; set; }

    [ValidateComplexType]
    public Department Department { get; set; } = new Department();
}

public class Department
{
    [Required]
    public string DepartmentName { get; set; }
}

<EditForm Model="@Employee">
    <ObjectGraphDataAnnotationsValidator />
    <InputText Id="name" Class="form-control" @bind-Value="@Model.Department.DepartmentName"></InputText>
    <ValidationMessage For="@(() => Model.Department.DepartmentName)" />
</EditForm>

<PropertyGroup>
  <AspNetCoreHostingModel>InProcess</AspNetCoreHostingModel>
</PropertyGroup>

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <!-- To customize the asp.net core module uncomment and edit the following section. 
  For more info see https://go.microsoft.com/fwlink/?linkid=838655 -->

  <system.webServer>
    <handlers>
      <remove name="aspNetCore"/>
      <add name="aspNetCore" path="*" verb="*" modules="AspNetCoreModulev2" resourceType="Unspecified"/>
    </handlers>
    <aspNetCore processPath="%LAUNCHER_PATH%" arguments="%LAUNCHER_ARGS%" stdoutLogEnabled="false" stdoutLogFile=".\logs\stdout">
      <handlerSettings>
        <handlerSetting name="experimentalEnableShadowCopy" value="true" />
        <handlerSetting name="shadowCopyDirectory" value="../ShadowCopyDirectory/" />
        <!-- Only enable handler logging if you encounter issues-->
        <!--<handlerSetting name="debugFile" value=".\logs\aspnetcore-debug.log" />-->
        <!--<handlerSetting name="debugLevel" value="FILE,TRACE" />-->
      </handlerSettings>
    </aspNetCore>
  </system.webServer>
</configuration>