SplashForm.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;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace InventoryManagement
{
    public partial class SplashForm : Form
    {
        public SplashForm()
        {
            InitializeComponent();
        }

        private Task ProcessData(List<string> list, IProgress<ProgressReport> progress)
        {
            int index = 1;
            int totalProcess = list.Count();
            var progressReport = new ProgressReport();
            return Task.Run(()=> {
                for (int i = 0; i < totalProcess; i++)
                {
                    progressReport.PercentComplete = index++ * 100 / totalProcess;
                    progress.Report(progressReport);
                    Thread.Sleep(10);
                }
            });
        }

       
        private async void SplashForm_Load(object sender, EventArgs e)
        {
            List<string> list = new List<string>();
            for (int i = 0; i < 1000; i++)
            {
                list.Add(i.ToString());
            }

            statusLbl.Text = "Working...";
            var progress = new Progress<ProgressReport>();
            progress.ProgressChanged += (o, report) =>
            {
                statusLbl.Text = String.Format("Processing...{0}%", report.PercentComplete);
                progressBar.Value = report.PercentComplete;
                progressBar.Update();
            };

            await ProcessData(list, progress);
            Form1 login = new Form1();
            this.Hide();
            login.Show();
        }

    }
}