RadzenDropDown get error in filter

Radzen.Blazor Components
1

Help me please. I get error when filter. This is my Code

     public class upuCountry
     {
            public int Id { get; set; }
            public string Code { get; set; }
            public string Desc { get; set; }
            public string RusName { get; set; }
      }

      <RadzenDropDown AllowClear="true" AllowFiltering="true" 
        FilterCaseSensitivity="FilterCaseSensitivity.CaseInsensitive" 
        Placeholder="Select..." TValue="string" Data=@customers.AsQueryable() 
        TextProperty="Desc" ValueProperty="Code" />

@code {

    IEnumerable<upuCountry> customers;
    
    protected override void OnInitialized()
    {
        customers = db.upuCountry.ToList(); 
    }    
}

This is error
image

2

I'm unable to reproduce such problem:

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image1920×1080 194 KB

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image1920×1080 109 KB

If you have Radzen subscription you can send us your project to debug it in order to provide more info.

3

Thank you. Your sample is work good.
May be due to data source

@page "/dropdown"
@inject ApplicationDbContext db;

4

Thank you. Now works