Trouble Connecting to Database

I'm using Dapper and SqlClient but I keep getting this error:

Unhandled exception. Microsoft.Data.SqlClient.SqlException (0x80131904): A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: TCP Provider, error: 35 - An internal exception was caught)

here is the code:

using System.Data;
using Dapper;
using Microsoft.Data.SqlClient;

namespace MacBlazor2
{
    public class DbHelper
    {
        private IDbConnection connection;

        public DbHelper() {
            connection = new SqlConnection("User ID=postgres;Password=password;Server=localhost:5432;Database=dvdrental;Pooling=true;Min Pool Size=0;Max Pool Size=100;Connection Lifetime=0;");
            Console.WriteLine(connection.Database);
            Console.WriteLine(connection.ConnectionString);
            foreach(Person p in connection.Query<Person>("SELECT actor_id, first_name, last_name FROM actor")) Console.WriteLine(p.first_name + " " + p.last_name);
        }

    }
}

using System.Data;
using Dapper;
using Microsoft.Data.SqlClient;

namespace MacBlazor2
{
    public class DbHelper
    {
        private IDbConnection connection;

        public DbHelper() {
            connection = new SqlConnection("User ID=postgres;Password=password;Server=localhost:5432;Database=dvdrental;Pooling=true;Min Pool Size=0;Max Pool Size=100;Connection Lifetime=0;");
            Console.WriteLine(connection.Database);
            Console.WriteLine(connection.ConnectionString);
            foreach(Person p in connection.Query<Person>("SELECT actor_id, first_name, last_name FROM actor")) Console.WriteLine(p.first_name + " " + p.last_name);
        }

    }
}

using System.Data;
using Dapper;
using Microsoft.Data.SqlClient;

namespace MacBlazor2
{
    public class DbHelper
    {
        private IDbConnection connection;

        public DbHelper() {
            connection = new SqlConnection("User ID=postgres;Password=password;Server=localhost:5432;Database=dvdrental;Pooling=true;Min Pool Size=0;Max Pool Size=100;Connection Lifetime=0;");
            Console.WriteLine(connection.Database);
            Console.WriteLine(connection.ConnectionString);
            foreach(Person p in connection.Query<Person>("SELECT actor_id, first_name, last_name FROM actor")) Console.WriteLine(p.first_name + " " + p.last_name);
        }

    }
}

using System.Data;
using Dapper;
using Microsoft.Data.SqlClient;

namespace MacBlazor2
{
    public class DbHelper
    {
        private IDbConnection connection;

        public DbHelper() {
            connection = new SqlConnection("User ID=postgres;Password=password;Server=localhost:5432;Database=dvdrental;Pooling=true;Min Pool Size=0;Max Pool Size=100;Connection Lifetime=0;");
            Console.WriteLine(connection.Database);
            Console.WriteLine(connection.ConnectionString);
            foreach(Person p in connection.Query<Person>("SELECT actor_id, first_name, last_name FROM actor")) Console.WriteLine(p.first_name + " " + p.last_name);
        }

    }
}

Trouble Connecting to Database

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