GUI Windows Form C#

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Windows.Forms;
//
class Form1 : Form {
    private Color theColor;
    public Form1() {
        InitializeComponent();
        tbRed.Text = "0";
        tbGreen.Text = "0";
        tbBlue.Text = "0";
    }
    private void parseRGB() {
        int r, g, b;
        r = Int16.Parse(tbRed.Text);
        r = Math.Min(r, 255);
        g = Int16.Parse(tbGreen.Text);
        g = Math.Min(g, 255);
        b = Int16.Parse(tbBlue.Text);
        b = Math.Min(b, 255);
        theColor = Color.FromArgb(r, g, b);
        tbHue.Text = theColor.GetHue().ToString();
        tbSat.Text = theColor.GetSaturation().ToString();
        tbBright.Text = theColor.GetBrightness().ToString();
        this.Invalidate();
    }
    private void tbRed_TextChanged(object sender, EventArgs e) {
        parseRGB();
    }
    private void tbGreen_TextChanged(object sender, EventArgs e) {
        parseRGB();
    }
    private void tbBlue_TextChanged(object sender, EventArgs e) {
        parseRGB();
    }
    private void Form1_Paint(object sender, PaintEventArgs e) {
        Graphics g = e.Graphics;
        SolidBrush backBrush = new SolidBrush(System.Drawing.SystemColors.Control);
        g.FillRectangle(backBrush, this.ClientRectangle);
        backBrush.Dispose();
        Rectangle r = new Rectangle(10, 80, 100, 40);
        SolidBrush b = new SolidBrush(theColor);
        g.SetClip(this.ClientRectangle);
        g.FillRectangle(b, r);
        b.Dispose();
    }
    private void InitializeComponent() {
        this.tbRed = new System.Windows.Forms.TextBox();
        this.tbGreen = new System.Windows.Forms.TextBox();
        this.label1 = new System.Windows.Forms.Label();
        this.label2 = new System.Windows.Forms.Label();
        this.label3 = new System.Windows.Forms.Label();
        this.tbBlue = new System.Windows.Forms.TextBox();
        this.tbHue = new System.Windows.Forms.TextBox();
        this.tbSat = new System.Windows.Forms.TextBox();
        this.label4 = new System.Windows.Forms.Label();
        this.label5 = new System.Windows.Forms.Label();
        this.label6 = new System.Windows.Forms.Label();
        this.tbBright = new System.Windows.Forms.TextBox();
        this.SuspendLayout();
        // 
        // tbRed
        // 
        this.tbRed.Location = new System.Drawing.Point(45, 10);
        this.tbRed.Name = "tbRed";
        this.tbRed.Size = new System.Drawing.Size(47, 20);
        this.tbRed.TabIndex = 1;
        this.tbRed.TextChanged += new System.EventHandler(this.tbRed_TextChanged);
        // 
        // tbGreen
        // 
        this.tbGreen.Location = new System.Drawing.Point(149, 10);
        this.tbGreen.Name = "tbGreen";
        this.tbGreen.Size = new System.Drawing.Size(47, 20);
        this.tbGreen.TabIndex = 2;
        this.tbGreen.TextChanged += new System.EventHandler(this.tbGreen_TextChanged);
        // 
        // label1
        // 
        this.label1.AutoSize = true;
        this.label1.Location = new System.Drawing.Point(13, 13);
        this.label1.Name = "label1";
        this.label1.Size = new System.Drawing.Size(25, 14);
        this.label1.TabIndex = 8;
        this.label1.Text = "Red";
        // 
        // label2
        // 
        this.label2.AutoSize = true;
        this.label2.Location = new System.Drawing.Point(106, 13);
        this.label2.Name = "label2";
        this.label2.Size = new System.Drawing.Size(36, 14);
        this.label2.TabIndex = 9;
        this.label2.Text = "Green";
        // 
        // label3
        // 
        this.label3.AutoSize = true;
        this.label3.Location = new System.Drawing.Point(212, 13);
        this.label3.Name = "label3";
        this.label3.Size = new System.Drawing.Size(27, 14);
        this.label3.TabIndex = 10;
        this.label3.Text = "Blue";
        // 
        // tbBlue
        // 
        this.tbBlue.Location = new System.Drawing.Point(246, 10);
        this.tbBlue.Name = "tbBlue";
        this.tbBlue.Size = new System.Drawing.Size(47, 20);
        this.tbBlue.TabIndex = 3;
        this.tbBlue.TextChanged += new System.EventHandler(this.tbBlue_TextChanged);
        // 
        // tbHue
        // 
        this.tbHue.Location = new System.Drawing.Point(45, 44);
        this.tbHue.Name = "tbHue";
        this.tbHue.ReadOnly = true;
        this.tbHue.Size = new System.Drawing.Size(47, 20);
        this.tbHue.TabIndex = 4;
        // 
        // tbSat
        // 
        this.tbSat.Location = new System.Drawing.Point(149, 44);
        this.tbSat.Name = "tbSat";
        this.tbSat.ReadOnly = true;
        this.tbSat.Size = new System.Drawing.Size(47, 20);
        this.tbSat.TabIndex = 5;
        // 
        // label4
        // 
        this.label4.AutoSize = true;
        this.label4.Location = new System.Drawing.Point(13, 47);
        this.label4.Name = "label4";
        this.label4.Size = new System.Drawing.Size(25, 14);
        this.label4.TabIndex = 11;
        this.label4.Text = "Hue";
        // 
        // label5
        // 
        this.label5.AutoSize = true;
        this.label5.Location = new System.Drawing.Point(121, 45);
        this.label5.Name = "label5";
        this.label5.Size = new System.Drawing.Size(21, 14);
        this.label5.TabIndex = 12;
        this.label5.Text = "Sat";
        // 
        // label6
        // 
        this.label6.AutoSize = true;
        this.label6.Location = new System.Drawing.Point(205, 47);
        this.label6.Name = "label6";
        this.label6.Size = new System.Drawing.Size(34, 14);
        this.label6.TabIndex = 13;
        this.label6.Text = "Bright";
        // 
        // tbBright
        // 
        this.tbBright.Location = new System.Drawing.Point(246, 42);
        this.tbBright.Name = "tbBright";
        this.tbBright.ReadOnly = true;
        this.tbBright.Size = new System.Drawing.Size(47, 20);
        this.tbBright.TabIndex = 6;
        // 
        // Form1
        // 
        this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
        this.ClientSize = new System.Drawing.Size(431, 217);
        this.Controls.Add(this.tbBright);
        this.Controls.Add(this.tbBlue);
        this.Controls.Add(this.label6);
        this.Controls.Add(this.label5);
        this.Controls.Add(this.label4);
        this.Controls.Add(this.label3);
        this.Controls.Add(this.label2);
        this.Controls.Add(this.label1);
        this.Controls.Add(this.tbSat);
        this.Controls.Add(this.tbHue);
        this.Controls.Add(this.tbGreen);
        this.Controls.Add(this.tbRed);
        this.Name = "Form1";
        this.Text = "Form1";
        this.Paint += new System.Windows.Forms.PaintEventHandler(this.Form1_Paint);
        this.ResumeLayout(false);
        this.PerformLayout();
    }
    private System.Windows.Forms.TextBox tbRed;
    private System.Windows.Forms.TextBox tbGreen;
    private System.Windows.Forms.Label label1;
    private System.Windows.Forms.Label label2;
    private System.Windows.Forms.Label label3;
    private System.Windows.Forms.TextBox tbBlue;
    private System.Windows.Forms.TextBox tbHue;
    private System.Windows.Forms.TextBox tbSat;
    private System.Windows.Forms.Label label4;
    private System.Windows.Forms.Label label5;
    private System.Windows.Forms.Label label6;
    private System.Windows.Forms.TextBox tbBright;
    [STAThread]
    static void Main() {
        Application.EnableVisualStyles();
        Application.Run(new Form1());
    }
}