¿Tengo algún error en la aplicación de dibujo C#?

Estoy usando Visual Studio 2010 para hacer una aplicación de dibujo, pero el problema es cuando intento compilar el programa que dice.

1) El nombre de tipo 'DrawingBoard' no existe en el tipo 'DrawingBoard.DrawingBoard' línea 33

2) El nombre de tipo 'Toolbox' no existe en el tipo 'DrawingBoard.DrawingBoard' línea 34

3) Se requiere una referencia de objeto para el campo, método o propiedad no estáticos 'DrawingBoard.DrawingBoard.EditOption.get' línea 74

el código de este programa está debajo. He señalado los errores con la palabra problema. te agradeceria mucho si me ayudas.

using System.Drawing;

namespace DrawingBoard
{
    partial class WinForm
    {
        /// <summary>
        /// Required designer variable.
        /// </summary>
        private System.ComponentModel.IContainer components = null;
        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }

        #region Windows Form Designer generated code

        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            this.splitContainerMain = new System.Windows.Forms.SplitContainer();
            this.drawingBoard = new DrawingBoard.DrawingBoard();//problem
            this.toolBox = new DrawingBoard.Toolbox.ToolBox();//problem
            this.splitContainerMain.Panel1.SuspendLayout();
            this.splitContainerMain.Panel2.SuspendLayout();
            this.splitContainerMain.SuspendLayout();
            this.SuspendLayout();
            // 
            // splitContainerMain
            // 
            this.splitContainerMain.Dock = System.Windows.Forms.DockStyle.Fill;
            this.splitContainerMain.Location = new System.Drawing.Point(0, 0);
            this.splitContainerMain.Margin = new System.Windows.Forms.Padding(2);
            this.splitContainerMain.Name = "splitContainerMain";
            // 
            // splitContainerMain.Panel1
            // 
            this.splitContainerMain.Panel1.Controls.Add(this.drawingBoard);
            // 
            // splitContainerMain.Panel2
            // 
            this.splitContainerMain.Panel2.Controls.Add(this.toolBox);
            this.splitContainerMain.Size = new System.Drawing.Size(853, 553);
            this.splitContainerMain.SplitterDistance = 532;
            this.splitContainerMain.SplitterWidth = 3;
            this.splitContainerMain.TabIndex = 37;
            // 
            // drawingBoard
            // 
            this.drawingBoard.AllowDrop = true;
            this.drawingBoard.AutoScroll = true;
            this.drawingBoard.BackColor = System.Drawing.Color.White;
            this.drawingBoard.BackgroundImageAlpha = ((byte)(255));
            this.drawingBoard.BackgroundImageLayout = System.Windows.Forms.ImageLayout.Stretch;
            this.drawingBoard.BackgroundImageX = 0;
            this.drawingBoard.BackgroundImageY = 0;
            this.drawingBoard.BoundedCanvasHeight = 1140;
            this.drawingBoard.BoundedCanvasWidth = 810;
            this.drawingBoard.CanvasOriginX = 0;
            this.drawingBoard.CanvasOriginY = 0;
            this.drawingBoard.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.Default;
            this.drawingBoard.Dock = System.Windows.Forms.DockStyle.Fill;
            this.drawingBoard.EditOption = DrawingBoard.EditOption.Select; //problem
            this.drawingBoard.GridColor = System.Drawing.Color.Gainsboro;
            this.drawingBoard.GridSize = 0;
            this.drawingBoard.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.Default;
            this.drawingBoard.IsBoundedCanvas = true;
            this.drawingBoard.Location = new System.Drawing.Point(0, 0);
            this.drawingBoard.Name = "drawingBoard";
            this.drawingBoard.PaperOutsideColor = System.Drawing.Color.FromArgb(((int)(((byte)(230)))), ((int)(((byte)(230)))), ((int)(((byte)(255)))));
            this.drawingBoard.ShowPaperOutside = true;
            this.drawingBoard.Size = new System.Drawing.Size(532, 553);
            this.drawingBoard.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
            this.drawingBoard.StickyEditOption = true;
            this.drawingBoard.TabIndex = 3;
            this.drawingBoard.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAlias;
            this.drawingBoard.Zoom = 1F;
            // 
            // toolBox
            // 
            this.toolBox.AutoSize = true;
            this.toolBox.Dock = System.Windows.Forms.DockStyle.Fill;
            this.toolBox.Drawingboard = null;
            this.toolBox.Location = new System.Drawing.Point(0, 0);
            this.toolBox.Margin = new System.Windows.Forms.Padding(4);
            this.toolBox.Name = "toolBox";
            this.toolBox.Size = new System.Drawing.Size(318, 553);
            this.toolBox.TabIndex = 1;
            // 
            // WinForm
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.BackColor = System.Drawing.Color.FromArgb(((int)(((byte)(192)))), ((int)(((byte)(255)))), ((int)(((byte)(192)))));
            this.ClientSize = new System.Drawing.Size(853, 553);
            this.Controls.Add(this.splitContainerMain);
            this.Name = "WinForm";
            this.Text = "DrawingBoard";
            this.splitContainerMain.Panel1.ResumeLayout(false);
            this.splitContainerMain.Panel2.ResumeLayout(false);
            this.splitContainerMain.Panel2.PerformLayout();
            this.splitContainerMain.ResumeLayout(false);
            this.ResumeLayout(false);

        }

        #endregion

        private System.Windows.Forms.SplitContainer splitContainerMain;
        private DrawingBoard drawingBoard;
        private global::DrawingBoard.Toolbox.ToolBox toolBox;

    }
}