ما الخطأ في هذا الكود ؟

أخواني اريد أعرف ما الخطأ في هذا الكود:

namespace WindowsFormsApplication1
{
	public partial class Form1 : Form
	{
		Button btn1;
		PictureBox Pic;
		public Form1()
		{

			Button btn1 = new Button();
			btn1.Text = "Load";
			btn1.Top = 10;
			btn1.Left = 10;
			btn1.Click += new System.EventHandler(this.OnLoadClick);

			PictureBox Pic = new PictureBox();
			Pic.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;
			Pic.Size = Pic.Size - btn1.Size;
			Pic.Width = this.Width / 3;
			Pic.Height = this.Height / 3;
			Pic.Left = (this.Width - Pic.Width) / 2;
			Pic.Top = (this.Height - Pic.Height) / 2;
			this.Controls.Add(btn1);
			this.Controls.Add(Pic);

		}
		private void OnLoadClick(object sender, System.EventArgs e)
		{
			OpenFileDialog dlg = new OpenFileDialog();
			dlg.Title = "Open Photo";
			dlg.Filter = "jpg files (*.jpg)|*.jpg|All files (*.*)|*.*";
			dlg.ShowDialog();
			if (dlg.ShowDialog() == DialogResult.OK) 
			{
				Pic.ImageLocation = dlg.FileName;
			}

		}

		static void Main()
		{

			Application.Run(new Form1());
		}


	}
}