Converting visual basic 6 to Visual C# 2008

using System.Data;
using System.Drawing;
//using AxLVbuttons;
    using System.Diagnostics;
//using AxMSComCtl2;
    using Microsoft.VisualBasic;
using AxCrystal;
using Microsoft.VisualBasic.Compatibility;
using System;
using System.Collections;
//using AxMSFlexGridLib;
    using System.Windows.Forms;

namespace Huvtsas
{
    partial class frmLogin : System.Windows.Forms.Form
    {

#region Default Instance




        public static frmLogin Default
        {
            get
            {
                if (defaultInstance == null)
                {
                    defaultInstance = new frmLogin();
                    defaultInstance.FormClosed += new FormClosedEventHandler(defaultInstance_FormClosed);
                }

                return defaultInstance;
            }
        }

        static void defaultInstance_FormClosed(object sender, FormClosedEventArgs e)
        {
            defaultInstance = null;
        }

#endregion
        public void Command1_Click(System.Object eventSender, System.EventArgs eventArgs)
        {
            short Index = Command1.GetIndex(eventSender);
            switch (Index)
            {
                case 0:
                    login();
                    break;
                case 1:
                    this.Close();
                    break;
            }
        }

        public void frmLogin_KeyPress(System.Object eventSender, System.Windows.Forms.KeyPressEventArgs eventArgs)
        {
            short KeyAscii = (short) (Strings.Asc(eventArgs.KeyChar));
            if (KeyAscii == 27)
            {
                this.Close();
            }
            eventArgs.KeyChar = Strings.Chr(KeyAscii);
            if (KeyAscii == 0)
            {
                eventArgs.Handled = true;
            }
        }

        public void frmLogin_Load(System.Object eventSender, System.EventArgs eventArgs)
        {
            Text1[0].Text = Interaction.GetSetting("GAMAS", "Settings", "Userh", "");
        }

        public void Text1_KeyPress(System.Object eventSender, System.Windows.Forms.KeyPressEventArgs eventArgs)
        {
            short KeyAscii = (short) (Strings.Asc(eventArgs.KeyChar));
            short Index = Text1.GetIndex(eventSender);
            if (KeyAscii == 13)
            {
                switch (Index)
                {
                    case 0:
                        Text1[1].Focus();
                        break;
                    case 1:
                        login();
                        break;
                }
            }
            eventArgs.KeyChar = Strings.Chr(KeyAscii);
            if (KeyAscii == 0)
            {
                eventArgs.Handled = true;
            }
        }

        private object login()
        {
            try
            {
                this.Cursor = System.Windows.Forms.Cursors.WaitCursor;
                RDO.rdoResultset rs_login;
                modFormat.SQL = "exec free_sp_login \'" + modFormat.l_str((string) (Text1[0].Text)) + "\',\'" + modFormat.l_str((string) (Text1[1].Text)) + "\'";
                rs_login = modFormat.cn.OpenResultset(modFormat.SQL, 1, null, null);
                this.Cursor = System.Windows.Forms.Cursors.Default;
                if (rs_login[0].Value == "0")
                {
                    Interaction.MsgBox("Òà íýâòðýõ ýðõãvé.", MsgBoxStyle.Information, Text);
                }
                else
                {
                    Interaction.SaveSetting("GAMAS", "Settings", "Userh", (string) (Text1[0].Text));
                    modFormat.USERID = (string) (rs_login[0].Value);
                    frmMain.Default.Show();
                    this.Close();
                }
            }
            catch
            {
                this.Cursor = System.Windows.Forms.Cursors.Default;
                Interaction.MsgBox(Information.Err().Description, MsgBoxStyle.Critical, Text);
            }
        }

        public void Timer1_Tick(System.Object eventSender, System.EventArgs eventArgs)
        {
            Timer1.Enabled = false;
            if (Strings.Trim((string) (Text1[0].Text)) != "")
            {
                Text1[1].Focus();
            }
        }
    }
}