Please, help me.

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Jun 30, 2021
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I have a question. You should do a check that will check if the company exists or not. This should be displayed as a message.
I do this in Blazor (C #).

User.cs:
[Table("Users")]
public class User
{
[Display(AutoGenerateField = false)]
public int UserId { get; set; }

[Display(Name = "UserName")]
[Required(ErrorMessage = "UserName is required.")]
public string UserName { get; set; }

[Display(Name = "Password")]
[Required]
[MinLength(8, ErrorMessage = "password must be atleast 8 characters")]
[DataType(DataType.Password)]
public string Password { get; set; }

[Display(Name = "Email")]
[Required(ErrorMessage = "Email is required.")]
public string Email { get; set; }

[Display(Name = "Company")]
[StringLength(255)]
[Required(ErrorMessage = "Company is required.")]
[Remote("doesCompanyExist", "Company", HttpMethod = "POST", ErrorMessage = "Company already exists. Please enter a different company.")]
public string Company { get; set; }

public User GetRegisteredUser()
{
return new User
{
UserName = UserName,
Password = Password,
Email = Email,
Company = Company,

};
}

}

Register.razor:
@page "/register"

@using TestBlazor.Models

<br />
<br />

<h3><b>Register</b></h3>
<br />

<EditForm class="needs-validation" Model="@_user" OnValidSubmit="@HandleValidSubmit" OnInvalidSubmit="@HandleInvalidSubmit">
<div class="alert @StatusClass">@StatusMessage</div>
<DataAnnotationsValidator />
<ValidationSummary />
<div class="form-group">
<p><b>User name</b></p>
<input id="username" class="solid" name="username" placeholder="Your username.." @bind-value="_user.UserName" />
<ValidationMessage For="@(() => @_user.UserName)"></ValidationMessage>
</div>
<div class="form-group">
<p><b>Password</b></p>
<input type="password" class="solid" id="password" placeholder="Your password.." @bind-value="_user.Password" />
<ValidationMessage For="@(() => @_user.Password)"></ValidationMessage>
</div>
<div class="form-group">
<p><b>Email</b></p>
<input id="email" class="solid" placeholder="(e-mail address removed)" @bind-value="_user.Email" />
<ValidationMessage For="@(() => @_user.Email)"></ValidationMessage>
</div>
<div class="form-group">
<p><b>Company</b></p>
<input id="company" class="solid" placeholder="Your company.." @bind-value="_user.Company" />
<ValidationMessage For="@(() => @_user.Company)"></ValidationMessage>
</div>


<br />

<button disabled="@loading" class="btn btn-primary">

@if (loading)
{
<span class="spinner-border spinner-border-sm mr-1"></span>
<NavLink href="/login" class="btn btn-link">Register</NavLink>
}
Register
</button>
<NavLink href="/login" class="btn btn-link">Login</NavLink>
</EditForm>



@code {
private User _user = new User();

private string StatusMessage;
private string StatusClass;

private bool loading;


private void OnValidSubmit()
{
if (loading == true)
{
Console.WriteLine("You have successfully registered!");
}

else
{
loading = false;
Console.WriteLine("Check your information again!");
}
}

protected void HandleValidSubmit()
{
StatusClass = "alert-info";
StatusMessage = " You have successfully registered! Please click the Login button to log in!";
}

protected void HandleInvalidSubmit()
{
StatusClass = "alert-danger";
StatusMessage = " Check your information again!";
}


public bool doesCompanyExist(string Company)
{
try
{

if (Company != null)
{
return true;
}

}
catch (Exception)
{
return false;
}

return false;

}

}

AppDbContext.cs:
public class AppDbContext : DbContext
{
public AppDbContext()
{

}

public AppDbContext(DbContextOptions<AppDbContext> options) : base(options)
{
}

protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
{
if (!optionsBuilder.IsConfigured)
{
optionsBuilder.UseSqlServer("Data Source=(LocalDb)\\MSSQLLocalDB;Initial Catalog=testblazor;Integrated Security=True;");
}
}

//protected override void OnModelCreating(ModelBuilder modelBuilder)
//{
// base.OnModelCreating(modelBuilder);
// modelBuilder.Entity<User>()
//}

public DbSet<User> User { get; set; }
public DbSet<Item> Items { get; set; }


}
 

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