Textbox (Windows Control) tasarımı - C#

 
  class mTextBox : Control 
      { 
   
          private bool frame = true; 
   
          private Color frameColor = Color.Black; 
   
          private bool backGround = true; 
   
          private Color BackGroundColor = Color.White; 
   
          private int selectIndex = 0; 
   
          private int selectionLenght = 0; 
   
   
   
          public mTextBox() 
              : base() 
          { 
              this.Paint += new PaintEventHandler(mTextBox_Paint); 
              this.KeyDown += new KeyEventHandler(mTextBox_KeyDown); 
          } 
   
          void mTextBox_KeyDown(object sender, KeyEventArgs e) 
          { 
              update(); 
          } 
   
          void update() 
          { 
              Update(); 
              this.InvokePaint(this, new PaintEventArgs(this.CreateGraphics(), new Rectangle(0, 0, this.Size.Width, this.Size.Height))); 
          } 
   
          void mTextBox_Paint(object sender, PaintEventArgs e) 
          { 
              if (backGround) 
              { 
                  e.Graphics.FillRectangle(new SolidBrush(BackGroundColor), new Rectangle(0, 0, this.Size.Width, this.Size.Height)); 
              } 
              if (frame) 
              { 
                  Pen p = new Pen(new SolidBrush(frameColor), 2f); 
                  e.Graphics.DrawRectangle(p, new Rectangle(0, 0, this.Size.Width, this.Size.Height)); 
              } 
              e.Graphics.DrawString(this.Text, this.Font, new SolidBrush(this.ForeColor), new PointF(5, 5)); 
          } 
   
           
   
      }