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using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.Windows.Forms;
namespace picImgDropMoveTest
{
public partial class Form1 : Form
{
PictureBox pictureBox1 = new PictureBox();
PictureBox pictureBox2 = new PictureBox();
Bitmap bm;
Metafile mf;//
 
public Form1()
{
    pictureBox1.BorderStyle = BorderStyle.FixedSingle;
    pictureBox1.Location = new Point(10, 20);
    pictureBox1.Size = new Size(200, 200);
    pictureBox1.SizeMode = PictureBoxSizeMode.Zoom;
    pictureBox1.DragDrop += _DragDrop;
    pictureBox1.MouseDown += pic_MD;
    pictureBox1.DragEnter += _DragEnter;
    pictureBox2.BorderStyle = BorderStyle.FixedSingle;
    pictureBox2.Location = new Point(220, 20);
    pictureBox2.Size = new Size(200, 200);
    pictureBox2.SizeMode = PictureBoxSizeMode.Zoom;
    pictureBox2.DragDrop += pictureBox2_DragDrop;
    pictureBox2.DragEnter += pictureBox2_DragEnter;
    this.ClientSize = new Size(440, 240);
    this.Controls.Add(this.pictureBox2);
    this.Controls.Add(this.pictureBox1);
    pictureBox1.AllowDrop = true;
    pictureBox2.AllowDrop = true;
}
private void _DragEnter(object sender, DragEventArgs e)
{
    if (e.Data.GetDataPresent(DataFormats.FileDrop))
        e.Effect = DragDropEffects.Copy;
    else
        e.Effect = DragDropEffects.None;
}
private void _DragDrop(object sender, DragEventArgs e)
{
    string[] FilePath;
    FilePath = (string[])e.Data.GetData(DataFormats.FileDrop, false);
    string fname = FilePath.Length > 0 ? FilePath[0] : "";
    if ("" == fname) return;
    pictureBox1.LoadAsync(fname);
}
private void pic_MD(object sender, MouseEventArgs e)
{
    if (e.Button != MouseButtons.Left) return;
    bm = pictureBox1.Image as Bitmap;
    mf = pictureBox1.Image as Metafile;//
    if ((bm == null && mf == null) || bm == pictureBox1.ErrorImage) return;//if (bm == null|| bm == pictureBox1.ErrorImage) return;
    DataObject dataObj = bm != null ? new DataObject(DataFormats.Bitmap, bm) : new DataObject(DataFormats.MetafilePict, mf);// DataObject dataObj = new DataObject(DataFormats.Bitmap, bm); 
    DragDropEffects dde = pictureBox1.DoDragDrop(dataObj, DragDropEffects.Copy);
}
private void pictureBox2_DragEnter(object sender, DragEventArgs e)
{
    if (e.Data.GetDataPresent(DataFormats.Bitmap) || e.Data.GetDataPresent(DataFormats.MetafilePict))// if (e.Data.GetDataPresent(DataFormats.Bitmap))
        e.Effect = DragDropEffects.Copy;
    else
        e.Effect = DragDropEffects.None;
}
private void pictureBox2_DragDrop(object sender, DragEventArgs e)
{
    if (bm == null && mf == null) return;//if (bm == null) return;
    if (bm != null) pictureBox2.Image = bm; else pictureBox2.Image = mf;//pictureBox2.Image = bm;
}
}
 
static class Program
{
[STAThread]
static void Main()
{
    Application.EnableVisualStyles();
    Application.SetCompatibleTextRenderingDefault(false);
    Application.Run(new Form1());
}
}
 
}
 

prog.cs(4,22): error CS0234: The type or namespace name `Forms' does not exist in the namespace `System.Windows'. Are you missing `System.Windows.Forms' assembly reference?
prog.cs(7,30): error CS0246: The type or namespace name `Form' could not be found. Are you missing an assembly reference?
prog.cs(9,1): error CS0246: The type or namespace name `PictureBox' could not be found. Are you missing an assembly reference?
prog.cs(10,1): error CS0246: The type or namespace name `PictureBox' could not be found. Are you missing an assembly reference?
prog.cs(35,40): error CS0246: The type or namespace name `DragEventArgs' could not be found. Are you missing an assembly reference?
prog.cs(42,39): error CS0246: The type or namespace name `DragEventArgs' could not be found. Are you missing an assembly reference?
prog.cs(50,36): error CS0246: The type or namespace name `MouseEventArgs' could not be found. Are you missing an assembly reference?
prog.cs(59,51): error CS0246: The type or namespace name `DragEventArgs' could not be found. Are you missing an assembly reference?
prog.cs(66,50): error CS0246: The type or namespace name `DragEventArgs' could not be found. Are you missing an assembly reference?
Compilation failed: 9 error(s), 0 warnings

Standard output is empty