Error 1 'Connect_class': member names cannot be the same as their enclosing type

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Data.SqlClient;

namespace test_class
{
    class Connect_class
    {
        public static SqlConnection conn = null;

        public void Connect_class()
        {
            String SqlConn;
            SqlConn = "SERVER=localhost;UID=inventory_db;PASSWORD=P@ssw0rd;DATABASE";
            conn = new SqlConnection(SqlConn);
            conn.Open();
        }
        
    }
}

Form1.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Data.SqlClient;

namespace test_class
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            Connect_class NewConnect = new Connect_class();
            NewConnect.Connect_class();

            SqlCommand com = new SqlCommand();
            com.Connection = Connect_class.conn;
            com.CommandText = "select * from dbo.Employee Where Employee_Username like '"+this.TextUsername.Text+"'and Employee_Password'"+this.textPassword.Text+"' ";
            com.ExecuteNonQuery();

        }
    }
}