class="modified valid form-control"

class="modified invalid form-control"

EditContext = new EditContext(Model);
EditContext.SetFieldCssClassProvider(new BootstrapFieldCssClassProvider());

using System;
using System.Linq;
using Microsoft.AspNetCore.Components.Forms;

namespace BlazorComponents
{
    /// <summary>
    /// Supplies CSS class names for form fields to represent their validation state or other state information from an EditContext.
    /// </summary>
    public class BootstrapFieldCssClassProvider : FieldCssClassProvider
    {
        /// <summary>
        /// Gets a string that indicates the status of the specified field as a CSS class.
        /// </summary>
        public override string GetFieldCssClass(EditContext editContext, in FieldIdentifier fieldIdentifier)
        {
            if (editContext == null)
            {
                throw new ArgumentNullException(nameof(editContext));
            }

            var isValid = !editContext.GetValidationMessages(fieldIdentifier).Any();

            if (editContext.IsModified(fieldIdentifier))
            {
                return isValid ? "is-valid" : "is-invalid";
            }
            return isValid ? "" : "is-invalid";
        }
    }
}

protected void Application_Start(object sender, EventArgs e)
        {
            RouteTable.Routes.MapPageRoute("Product", "Product/{Name}", "~/Product.aspx");
        }

RouteTable.Routes.MapPageRoute("PostDetail", "Post/{pi}/{pt}", "~/PostShow.aspx");

<a href='<%# string.Format("/Post/{0}/{1}",Eval("PostID"),Eval("PostTitle").ToString().Replace(" ","-")) %>'>

Post/12/چگونه-طراحان-وب-به-جهنم-می-روند!؟

int pi = int.Parse(Page.RouteData.Values["pi"].ToString());
Posts post = (from p in con.Posts where p.PostID == pi select p).FirstOrDefault();

<asp:EntityDataSource ID="EntityDataSource1" runat="server" 
        AutoGenerateWhereClause="True" ConnectionString="name=WebWorkEntities" 
        DefaultContainerName="WebWorkEntities" EnableFlattening="False" 
        EntitySetName="Posts" EntityTypeFilter="Posts" Where="" Select="">
        <WhereParameters>
            <asp:RouteParameter Name="PostID" RouteKey="pi" DbType="Int32" 
                DefaultValue="0" />
        </WhereParameters>
    </asp:EntityDataSource>

protected void Application_Start(object sender, EventArgs e)
        {
            RoutingSite(RouteTable.Routes);
        }

        public static void RoutingSite(RouteCollection route)
        {
            route.MapPageRoute("PostDetail", "Post/{pi}/{pt}", "~/PostShow.aspx");
            route.MapPageRoute("RouteAbout", "About-Me", "~/About.aspx");            
        }