Aplikasi Resizer Image

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

namespace Aplikasi_jaringan_net_3_0
{
    public partial class Form1 : Form
    {
        private Image gambar;
        public Form1()
        {
            InitializeComponent();
            this.StartPosition = FormStartPosition.CenterScreen;
            this.FormBorderStyle = FormBorderStyle.FixedSingle;
            this.MaximizeBox = false;
            this.MinimizeBox = false; tsize.MaxLength = 3;
            tsize.Enabled = false;
        }
        void ubahsize()
        {
            if (tsize.Text != "")
            {
                int persen = Convert.ToInt32(tsize.Text);
                int tinggi = (persen * Convert.ToInt32(ltinggi.Text)) / 100;
                int lebar = (persen * Convert.ToInt32(llebar.Text)) / 100;
                ltinggi.Text = Convert.ToString(tinggi);
                llebar.Text = Convert.ToString(lebar);
            }
        }
        void simpangambar()
        {
            int tinggi = Convert.ToInt32(ltinggi.Text);
            int lebar = Convert.ToInt32(llebar.Text);
            Bitmap ukuranbaru = new Bitmap(lebar, tinggi, System.Drawing.Imaging.PixelFormat.Format24bppRgb);
            Graphics gbr = Graphics.FromImage(ukuranbaru); gbr.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighSpeed;
            gbr.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighSpeed;
            gbr.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
            gbr.PixelOffsetMode = System.Drawing.Drawing2D.PixelOffsetMode.HighSpeed;
            Rectangle rect = new Rectangle(0, 0, lebar, tinggi);
            gbr.DrawImage(gambar, rect);
            SaveFileDialog simpan = new SaveFileDialog();
            simpan.Filter = "Jpeg Format|*.Jpg";
            simpan.RestoreDirectory = true;
            if (simpan.ShowDialog() != DialogResult.Cancel)
            {
                ukuranbaru.Save(simpan.FileName);
                ukuranbaru.Dispose();
                MessageBox.Show("Gambar Berhasil Disimpan", "Info");
            }
        }
        void bukagambar()
        {
            OpenFileDialog bukagambar = new OpenFileDialog();
            if (bukagambar.ShowDialog() == DialogResult.OK)
            {
                this.gambar = Image.FromFile(bukagambar.FileName);
                picture.SizeMode = PictureBoxSizeMode.StretchImage;
                picture.ImageLocation = bukagambar.FileName;
                ltinggi.Text = gambar.Height.ToString();
                llebar.Text = gambar.Width.ToString();
                tsize.Enabled = true;
                tsize.Clear();
            }
        }

        private void bsimpan_Click(object sender, EventArgs e)
        {
            simpangambar();
        }

        private void tsize_TextChanged(object sender, KeyEventArgs e)
        {
            if (e.KeyCode == Keys.Enter) 
            {   
                ubahsize(); 
            }
        }
        private void bbuka_Click(object sender, EventArgs e)
        {
    bukagambar();
        }
    }
}