フォーム（Form1）内のピクチャーボックス（PictureBox1）の画像をＤｒａｇするサンプルです。

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// using System.IO; string PictureFileName = @"C:\sample.bmp"; private void Form1_Load(object sender, EventArgs e) {     using (FileStream fs = new FileStream(PictureFileName, FileMode.Open, FileAccess.Read))     {         PictureBox1.Image = new Bitmap(Image.FromStream(fs));     } } private void PictureBox1_MouseDown(object sender, MouseEventArgs e) {     if (e.Button == MouseButtons.Left && PictureFileName != "")     {         string[] FileNames = { PictureFileName };         DataObject dataObj = new DataObject(DataFormats.FileDrop, FileNames);         dataObj.SetData(DataFormats.Bitmap, Image.FromFile(FileNames[0]));         PictureBox1.DoDragDrop(dataObj, DragDropEffects.All);     } }