'System.data.sqlclient' wasn't found in the list of registered .NET core data providers.'

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C#

ADO.NET

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web.config

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I am developing .net core and angular web application. In this solution, we are calling the database using another class library in .net 5. So, When it coming to create a connection
It says below Error:

"

'System.Data.SqlClient' wasn't found in the list of registered .NET core Data Providers.'

Below is my DB Factory Class

using Microsoft.Extensions.Configuration;
using System.Configuration;
using System.Data.Common;

namespace Portal.DAL.DataAccess
{
    public class GenericDbFactory
    {
        protected const string ProviderInvarientName = "System.Data.SqlClient";

        public static DbProviderFactory Factory
        {
            get
            {
                return DbProviderFactories.GetFactory(ProviderInvarientName);
            }
        }

        public static DbConnection GetConnection(string dbName, IConfiguration configuration)
        {
            string ConnectionString = configuration.GetConnectionString("DefaultConnection");
            DbConnection Connection = Factory.CreateConnection();
            Connection.ConnectionString = ConnectionString;
            return Connection;
        }
    }
}

Please help me to solve this error.

Have a nice day!

What I have tried:

Tried with Microsoft documentation in data providers
Searched everywhere on the internet.